I'm just starting out in electronics. Self-teaching from books, internet, experimentation, and kick ass videos like your entire simple circuit series. Just wanted to say thank you and compliment on how thorough and helpful they are
I’ve used the single stage delay many times, it’s a great little circuit. I would very much like to see the second stage of that delay circuit. Great video Paul.
Yes I would too. And if there's more stages and other little tricks ya can do with it id love to know about them to coz that was the coolest circuit I've seen in a good while.
You know you're learning when you understand what's happening before you can explain it! This is because I've watched a bunch of your basic circuit videos....great job!
I really appreciate this series. Building-block circuits explained and demonstrated for the average tinkerer is something I haven't seen before. There are many videos about components, many videos about full applications, but not much at this in-between level.
I have watched a thousand, maybe more, of videos from this theme and did not understand how it works. With this video, i fully undestood! A simple video and made all the difference, for me, to undestand. THank u.
Sir! You just saved my IoT Capstone project!! I was looking for the simplest delay circuit(without 555 timer) to capture if a button is pressed when my Microcontroller board is reset. With this simple circuit I will now be able to persist the button press event and read it after my Microcontroller board boots up. Thanks a lot for making this video. God Bless you! :)
You should make a book with all basic circuits like this. The reason is because currently im in school and we don't get to teach this simple circuits and i find it pretty nessecary.I bet the next generation will forget half of this circuits, lucky your videos still exist to teach us about it. Still I would love to have a book with 500+ basic circuits
Brilliant teachers, make complicated things, look all so simple and easy to understand. I see those lovely hands, my mind experience this video, as if i was doing it myself. The best learning experience. Cant help but like this awesome teacher.
Just wanted to give you some feedback on this delay circuit. I’ve replayed it a few times, and each time I get just a little more out of it. You really opened the gate to my next project, I might come back to say it again!
I too do enjoy these simple videos. Thank you for the video. I would also like to se the dual stage and I would also like to see how to alter the function to a instant turn off instead of fading out.
@@kensmith5694 Hi need to get the LED to stop more crisply too, at present it slowly fades away to a stop. Are you suggesting that a 100ohm resistor and switch placed together in parallel to the capacitor. The circuit does just what I need apart from this slow fade to off. Dont know whether anyone reads these as it is few months old now but thanks if you do.
@@johnhirst4673 Do you want a delayed turn on and a sudden turn off? There are options for the off action: 1) Use a switch to discharge the capacitor 2) Open the positive power connection. 3) Open the negative power connection. If you explain clearly what you want a circuit to do, you are usually 75% of the way to a good design. A "slow on, fast off" usually works something like this: To turn on a resistor charges up a capacitor and slowly biases a transistor on. To turn off, the switch either forces the capacitor to discharge quickly or opens the power connection to the whole thing.
Using differential equations to solve this you would still have to take into account R and C in order to find the actual voltage over C at time t. I think it's still an RC circuit with the difference being you are using the cap to bias the transistor until it fully discharges. If there were no resistance the cap would discharge very quickly. You can't really control it with R though which is maybe where the confusion is. Otherwise you risk changing the biasing on the transistor, so you can only control the discharge rate by changing the capacitance value. Under the wraps though you are dealing with an RC circuit: VC = 1/C ∫ i dt Since Kirchoff says total voltages must add up to zero we can derive this Ri+ 1/C ∫ i dt = V Turning that into a differential equation with by differentiating with respect to t gives us this: R (di/dt) + i/C = 0 solving that differential equation gives us this: i = VR e^(-t/RC) So no matter how you shake it if you want to know the voltage over the cap at time t you would have to know the equivalent resistance
Hi Paul, I really like these kind of videos, sometimes you show the same circuit as I learned in school, but sometimes your circuit is completely different. It's fun to learn new things. Ty Paul 😉
I'm coming to this with nearly no knowledge of circuits or logic gates, but I still could understand how this works. Before this I had no clue how you could possibly cause delay in circuits since electricity moves instantly(more or less) along the wires, but the concept of using a capacitor that you slowly discharge is really really brilliant!
This is called the RC constant (resistor-capacitor) and you can use a resistor to control the rate of charge and discharge of a capacitor. If you are interested in these types of things have a look at my videos on the 555 timer.
I would add a resistor in series with your switch (maybe 100 ohms) to limit the current through the switch when it is closed. Drawing a momentary pulse of a few amps to charge up the 10uF capacitor could cause burnt spots on the switch contacts, and could cause a momentary voltage droop on the supply.
Thank you. Good simple circuit. Used a delay-relay circuit to increase gas flow for Toepler pump operation for high vacuum preparatory line. Worked very well.
You're like someone who can teach me electronics and can have a beer with!! Honestly, love this video and I subscribed and gave a thumbs up. Now I'm going binge on all your other videos.
I found this handy little circuit in a little flashing circuit that was meant for attaching to your shoe so it flashes when you walk. The switch was a simple vibration switch that triggered with eash footstep.
This basic circuit are the foundation to any hobbyst that what to seriously learn how to make useful creations. Simplicity it fundamental skill to learn to do amazing stuff. Thanks for sharing all this knowledge with all of use. Keep this hard work.... is good !!!!!!!
Hello. Enjoying your vids. I have a 1993 Mazda Miata, small car. For safety concerns I connected a relay to turn on Headlights and running lights so that lights always come on when ignition is on. That way I dont forget to turn my lights on even in day time. The car is small and low to the ground so I make it as visible as possible otherwise other drivers dont see me. The problem currently (pun?) is that I would like a delay of I guess 10 seconds before relay turns lights on. So I need the oppsite, Power up, off, delay, on. I have a toggle switch that cuts power to the relay. On the car lighting switch, the turn signal stem, I tapped the 3 wires which control other relays to operate the lights. The headlights pop up and light. But those 3 wires are low amperage control wires. So no heavy gauge wire was needed. I intend to add more LEDs on to increase visibility. But this may add to starter drain. So far its working and I can always toggle off then use the manual. Since I parallel the 3 headlight control wires the relay acts as independent switch. Its strange Japanese wiring as they use ground to switch. The 3 wires. Red=(headlight & refractors) white= running/parking lights) white+stripe(ground). The relay I bought was universal 5 prong, this only had one outcome circuit, so I had to tie running/parking to come on always with headlights/refractors. I dont know if they make one for two circuits. (single pole, double throw?). Alternatively, instead of delay I use output to starter to cut out relay. Maybe another relay with normally closed contacts. Your thoughts appreciated.
That was a very cool circuit and I think of lots of things I would use IT in!! So thanks for the knowledge Paul✊ really loved that one❤❤ keep um coming... more circuits like that one. Ones you found handy when you were learning. P.s. "circuits you should know" are my favourite videos you do. And i bet im not the only one too. So never stop making videos coz we all look foward to your next posts. 😳🙏👍
Exact same circuit but with the 1M across the cap and use an n-type FET. Might be best to include a 1k gate resistor but not essential. Turn off time will vary depending on FET threshold.
Thanks. I just discovered this. I'm looking to pulse a latching relay. I'm going over your circuits. I'm learning a lot by building the circuits and testing. Very simple parts. Great explanation.
okay this is gonna be weird and hard to explain, but i absolutely NEED this, can you make a circuit with a half second delay that then makes a half second +5v pulse?
SIR, if you put a potentiometer in place of the resister wouldn't you then have a variable control of the time and you wouldn't have to keep on changing the capacitor? Thank you for your kind presentation and your good will to the "people". Take care. - john
I came here to learn, and learn stuff i did!! Subscribed now. (not quite what I needed to learn, but close... I wanted to work out how to make a sequential switcher. So when i press a momentary switch it activates a few milliseconds later a transistor switch briefly. I think i can work something out from what i learnt here. .I want a very quick, 1 second or under transistor being in closed mode.... that I don't know how to achieve. Maybe no resistor... I need to try and see.
*Three small problems:* 1. No current limiting resistor before or after the switch = large cap charging current spike = switch contact corrosion 2. NPN Transistor should have the load between ground and the transistor 3. Technically this is a Soft-Start circuit not a delay circuit. Replace the Transistor with a Schmitt-Trigger IC to build a real delay circuit like this (or a MOSFET + drain resistor). PS: Also the switch should switch between 4.2V and Ground to improve the turn off time. Or at least put a drain resistor parallel to the capacitor
I think it would be great if you did a video, as you suggested, on a two stage delay. Mainly because you mentioned that it uses a PNP transistor which has always confounded me. Thanks for what you do!!
Really helpful for a newbie learner.....very clear thanks. How would changing the resistance between the capacitor and base effect things please? Thanks Jim uk
I liked this video because it shows and explains how this circuit works! I am also wanting to know if it's possible to take this delay circuit and use it for an application that runs on 120v 60hz 2.5 amps.
3:30 This is not a completely accurate description of how this node works. You missed the very first stage of charging the capacitor to the voltage drop of the base-emitter junction (typically 0.6 ... 0.7V), before that the transistor is closed. This feature can be used to delay switching on if a resistor is added in series with the button according to the RC time constant.
Nifty circuit and at first i thought 555-timer for something like this but i like this simpler variant. Cool series showing off useful circuits. Still hoping you can do a follow up on battery voltage monitoring.
I wonder if the light technically flickers near the end. Does it make a hard transition from On to Off? I am thinking on the scale of say 5ms that there may be a ripple in the voltage to the LED due to ambient EMR that could cause the LED to flicker for a very short moment. If this is a thing, it may be more pronounced when using a larger capacitor, say one that will take an hour to discharge, as nearing the end the voltage will be within that threshold region for a longer period of time.
@@michaelricketson1365 Yes, any wires in your circuit will act as a small antenna and develop small transient voltages as a result. Basically it puts noise into your circuit. To avoid it in areas where you want a stable voltage reading you can put a capacitor from your sensor wire to ground.
@@thedillestpickle ... Ah, thanks, I've learned something new. I've been using ceramic capacitors across the power pins of TTL chips to make up for power dips resulting from internal switching, but have not been aware of possible radio interference. Something to look for!
Hell yeah!!! Thanks a lot. Im aut!stic(high functioning), I've only halfway understood endless information I've read about Transistors, that one little statement you made finally showed me how simple it is(wonder why no one tries to explain it that way???), the base acts as a gate-valve for the channel which flows from collector to Emitter! But how is the amplified signal(in the case of audio amplification) produced at the collecter. Or is the amplified signal more so a voltage difference between the collector and the emitter, with resistor following after emitter to seperate from ground(so that the voltage on emitter side isn't 0 volts(ground)?
Hi @learnelectronics, Thank you for the great videos. Question: Is it possible to control the fade on and off time of the led by adding two potentiometers? One between voltage source and resistor/led, the other between ground and...?
I followed the method you connect all the components but my led only light up when I push the switch and goes off after I released the switch button. Why is it like that? Need answer urgently. Thanks
Thanks Paul, great! I'm trying to do a solar arduino friendly delay circuit. And I'm stumped. basically I want the solar cell to charge a capacitor, into a delay circuit, and when it's delayed long enough (?) it switches on the arduino for 30 secs or so, then turns it off. Is there a simple way to do that? So all us Arduino makers can have a simple circuit to let it charge, turn it on and report, then turn it off for 5 mins or so.....
Nice, Could you please do a soft start circuit? Have been looking for one for high voltage in the range of 400 volts with no luck, building a mono block tube amp and want to delay the plate voltage until the filaments heat up, hence prolonging tube life, I could buy a delay tube but are quite pricey as are the amp tubes, and would rather go solid state to preserve plate voltage and power. thanks a million.
wondering if the next step would be to somehow have the transistor drive the switch (replacing it with a pnp) so that it sorta flashes on and off maybe? no probably not...
Great video and no further delay How do you calculate the delay I am planning to use this setup to show a trigger signal Reason: I might be fast on my reflexes but i might miss a 1 mS signal so im thinking "hold" the signal for a second or so. will this delay be adequate or du i risk that the trigger signal is to fast to charge the capacitor?
Great video but I have added Bluetooth to a speaker but I’m using the audio jack in as my audio source but for some reason the speaker needs to see the jack plug put in after about 45 seconds after switching in the speaker before it will play any sound. I need a circuit that switches on after about 45seconds so basically the reverse of this circuit. Any ideas?
Nice, but how would you do if you want the LED to be frankly on during the delay, and suddenly gets off when delay is over with only basic electronic components (no IC or any other fancy component) ?
Would this work with line level sound signals? I build horn speakers and midbass horns become too large to physically timealign with the smaller horns in the midrange and treble horns. What about the V3205 bucket brigade delay chip?
Thanks for the video. I find it confusing when you said open up the transistor. If you take the pushbutton switch, it is normally open or not conducting until the button is pushed. Then the transistor is open or turned off until the current flows into the base, then it turns on. Thanks.
I want to do this for a relay circuit, using a 12V DC relay. Only need it to be maintained activated for a couple seconds maybe in the event of an accidental button release (the button needs to be pressed and held to activate an intercom system using some telephones that are getting switched off of the regular telephone line which they are connected to in the NC state). How do I determine what resistors and capacitors I will need?
Hi. I cant get any capacitors to work. What am I doing wrong. All caps are 50v 2.2uf to 100v 470uf. But caps have bin setting for a while 15years....and they check out with the multimeter.
Could a variation on this be used for an m-sync to x-sync converter? When an m-sync camera flash is used the flash bulb holder PC conector is shorted by the camera about 25mS before the shutter trips. For an electronic flash that prefiring leads to no flash when the shutter is open. The circuits I have seen have been fairly complex using an IC timer to trigger an SCR after 25 or 26 mS. Something simpler would be nice.
Hi, I used this circuit with a small Pulse Generator with the LCD display that has 3 Duty Cycle adjustments. I was making one of them offset so they won't fire 2 mosfets at the same time. I had a 10uf cap. It seems the Cap blows up the generator running at 12VDC If I use a 4N25 do you think it will blow too? Thanks
Hey i made a Door bell circuit using this circuit. at the end when capicitor charge goes out buzzer start sounding its dying. insted of lowering (diming the led) is there any way to cut down instantly the capicitor charge signal at certain level.
I was thinking about something like this, but with a power (mos)fet. Would that work? I want to trigger (and retrigger) something and stay on for somewhere between 1 to 10 minutes, when moving a bicycle. So the switch will be one of those vibration switches. Current maybe 1 or 2 amps hence the fet.
Ime thinking of a non switch yet power up immediate positive signal then negative off after delay so it's going to be similar but with a pnp transistor to drive a relay coil
I am looking more like timing for opposite, this is a timing off, I want a Timing on, the reason is because I want a layer of safety when a D1 mini power on some outputs does a small spike enough to activate a relay for a small time, so, I am doing a Wifi garage opener and don’t want have the chance after a power outage the garage opens by itself at the middle of the night!! Can you please guide me what I can do? Or make a video or share the link if you already have it. Thanks a lot!!!
Very interesting. good explanation. I'm looking for a solution similar to this design. No switch. 5vdc micro-b usb in, delay 60-90 seconds, the 5vdc out. This is to delay a Raspberry pi from power up before the TV comes ready. Sure, I see the 5v-30v delay relay timer module on amazon, but like you said - where's the fun in that. Any guidance is welcomed. Thanks
Making simple circuit diagrams on squared graph paper is the technique that Forrest M Mims used when he made the Radio Shack electronics tutorial books in the 1970s and 1980s.
What makes it not an RC circuit? it is still using the resistor cap relationship but the transistor allows us to Control the discharge time. is there a way to match components close to get desired time base? (range of the timer?) i tend to think of this as a timer i would combine it with a latch or Flip Flop circuit. :) which would eliminate the need for a manual Switch.
Does the capacitor charge instantly to 4.2v when you push the button, or should you hold the button down for a few seconds? Also the very long gradual dimming takes away from the usefulness of the circuit.
![Noob To Max With DRAGON REWORK In Blox Fruits [FULL MOVIE]](http://i.ytimg.com/vi/LnBMOinoOvA/mqdefault.jpg)
I'm just starting out in electronics. Self-teaching from books, internet, experimentation, and kick ass videos like your entire simple circuit series. Just wanted to say thank you and compliment on how thorough and helpful they are
I do not mind your "rambling" while doing these videos, I have learned so much about how things work from your videos, thank you.
I’ve used the single stage delay many times, it’s a great little circuit. I would very much like to see the second stage of that delay circuit. Great video Paul.
Yes I would too. And if there's more stages and other little tricks ya can do with it id love to know about them to coz that was the coolest circuit I've seen in a good while.
I would like to see a playlist created of "Classic Circuits You Should Know".
Look at the playlists my friend.
ruclips.net/p/PLGhvWnPsCr5_n-9fFQM6Sa9BZir0wvm59
learnelectronics Great, know one is private and cannot be viewed by ordinary folks :)
@@learnelectronics perfecto, muchas gracias
@@learnelectronics Great Idea Paul to have this series especially for us guys/gals just starting out
Try this ruclips.net/p/PL3X-iFMsLRglyTHjaV8ocz--Wtw9dnfLD
You know you're learning when you understand what's happening before you can explain it! This is because I've watched a bunch of your basic circuit videos....great job!
I really appreciate this series. Building-block circuits explained and demonstrated for the average tinkerer is something I haven't seen before. There are many videos about components, many videos about full applications, but not much at this in-between level.
I have watched a thousand, maybe more, of videos from this theme and did not understand how it works.
With this video, i fully undestood! A simple video and made all the difference, for me, to undestand.
THank u.
Sir! You just saved my IoT Capstone project!! I was looking for the simplest delay circuit(without 555 timer) to capture if a button is pressed when my Microcontroller board is reset. With this simple circuit I will now be able to persist the button press event and read it after my Microcontroller board boots up. Thanks a lot for making this video. God Bless you! :)
You should make a book with all basic circuits like this. The reason is because currently im in school and we don't get to teach this simple circuits and i find it pretty nessecary.I bet the next generation will forget half of this circuits, lucky your videos still exist to teach us about it. Still I would love to have a book with 500+ basic circuits
I love these basic and practical (transistor) circuits. They are great for learning and playing. Thank you very much for sharing your passion.
I really enjoy this series.
Brilliant teachers, make complicated things, look all so simple and easy to understand. I see those lovely hands, my mind experience this video, as if i was doing it myself. The best learning experience.
Cant help but like this awesome teacher.
Just wanted to give you some feedback on this delay circuit. I’ve replayed it a few times, and each time I get just a little more out of it. You really opened the gate to my next project, I might come back to say it again!
I too do enjoy these simple videos. Thank you for the video. I would also like to se the dual stage and I would also like to see how to alter the function to a instant turn off instead of fading out.
Replace the switch with a resistor.
Put 100 Ohms in series with the switch and place that across the capacitor.
@@kensmith5694 Hi need to get the LED to stop more crisply too, at present it slowly fades away to a stop. Are you suggesting that a 100ohm resistor and switch placed together in parallel to the capacitor. The circuit does just what I need apart from this slow fade to off. Dont know whether anyone reads these as it is few months old now but thanks if you do.
@@johnhirst4673
Do you want a delayed turn on and a sudden turn off?
There are options for the off action:
1) Use a switch to discharge the capacitor
2) Open the positive power connection.
3) Open the negative power connection.
If you explain clearly what you want a circuit to do, you are usually 75% of the way to a good design.
A "slow on, fast off" usually works something like this:
To turn on a resistor charges up a capacitor and slowly biases a transistor on.
To turn off, the switch either forces the capacitor to discharge quickly or opens the power connection to the whole thing.
Using differential equations to solve this you would still have to take into account R and C in order to find the actual voltage over C at time t. I think it's still an RC circuit with the difference being you are using the cap to bias the transistor until it fully discharges. If there were no resistance the cap would discharge very quickly. You can't really control it with R though which is maybe where the confusion is. Otherwise you risk changing the biasing on the transistor, so you can only control the discharge rate by changing the capacitance value. Under the wraps though you are dealing with an RC circuit:
VC = 1/C ∫ i dt
Since Kirchoff says total voltages must add up to zero we can derive this
Ri+ 1/C ∫ i dt = V
Turning that into a differential equation with by differentiating with respect to t gives us this:
R
(di/dt) + i/C = 0
solving that differential equation gives us this:
i = VR e^(-t/RC)
So no matter how you shake it if you want to know the voltage over the cap at time t you would have to know the equivalent resistance
So what is the formula to calculate the delay? Is it just a simple RC constant? Because here it would give us 10 sec but it looks like it's more 30...
Stéphane Muller 5RC
@@stephanemuller7032 V=Ve^-t/RC(voltage equal to voltage times e the power negative time over RC(time constant))
Hi Paul, I really like these kind of videos, sometimes you show the same circuit as I learned in school, but sometimes your circuit is completely different. It's fun to learn new things. Ty Paul 😉
I'm coming to this with nearly no knowledge of circuits or logic gates, but I still could understand how this works. Before this I had no clue how you could possibly cause delay in circuits since electricity moves instantly(more or less) along the wires, but the concept of using a capacitor that you slowly discharge is really really brilliant!
This is called the RC constant (resistor-capacitor) and you can use a resistor to control the rate of charge and discharge of a capacitor. If you are interested in these types of things have a look at my videos on the 555 timer.
I would add a resistor in series with your switch (maybe 100 ohms) to limit the current through the switch when it is closed. Drawing a momentary pulse of a few amps to charge up the 10uF capacitor could cause burnt spots on the switch contacts, and could cause a momentary voltage droop on the supply.
That is exactly what I am thinking. Not sure why there is no resistor to limit the capacitor current. Maybe the capacitor is too small?
Likely omitted for simplicity of the lesson but good point
Thank you for making this incredible content. I am doing my best to expose my 10 year old daughter to these basics I was taught at her age.
Thank you. Good simple circuit.
Used a delay-relay circuit to increase gas flow for Toepler pump operation for high vacuum preparatory line. Worked very well.
You're like someone who can teach me electronics and can have a beer with!! Honestly, love this video and I subscribed and gave a thumbs up. Now I'm going binge on all your other videos.
Thanks
I found this handy little circuit in a little flashing circuit that was meant for attaching to your shoe so it flashes when you walk. The switch was a simple vibration switch that triggered with eash footstep.
This basic circuit are the foundation to any hobbyst that what to seriously learn how to make useful creations. Simplicity it fundamental skill to learn to do amazing stuff. Thanks for sharing all this knowledge with all of use. Keep this hard work.... is good !!!!!!!
Hello. Enjoying your vids. I have a 1993 Mazda Miata, small car. For safety concerns I connected a relay to turn on Headlights and running lights so that lights always come on when ignition is on. That way I dont forget to turn my lights on even in day time. The car is small and low to the ground so I make it as visible as possible otherwise other drivers dont see me.
The problem currently (pun?) is that I would like a delay of I guess 10 seconds before relay turns lights on. So I need the oppsite, Power up, off, delay, on.
I have a toggle switch that cuts power to the relay. On the car lighting switch, the turn signal stem, I tapped the 3 wires which control other relays to operate the lights. The headlights pop up and light. But those 3 wires are low amperage control wires. So no heavy gauge wire was needed.
I intend to add more LEDs on to increase visibility. But this may add to starter drain. So far its working and I can always toggle off then use the manual. Since I parallel the 3 headlight control wires the relay acts as independent switch.
Its strange Japanese wiring as they use ground to switch. The 3 wires. Red=(headlight & refractors) white= running/parking lights) white+stripe(ground).
The relay I bought was universal 5 prong, this only had one outcome circuit, so I had to tie running/parking to come on always with headlights/refractors. I dont know if they make one for two circuits. (single pole, double throw?).
Alternatively, instead of delay I use output to starter to cut out relay. Maybe another relay with normally closed contacts.
Your thoughts appreciated.
forgot to mention, the delay might be nicer as headlights might pop up/down annoying when struggle with starting
You gotta love this, brings back good memories. A 2 stage would really add to this.
6:49 Here I am to learn about some circuits and this guy drops a heavy synagogue shooting on me as a passive aside.
It is so simple never thinked about cap connect to base. Thanks!
That was a very cool circuit and I think of lots of things I would use IT in!! So thanks for the knowledge Paul✊ really loved that one❤❤ keep um coming... more circuits like that one. Ones you found handy when you were learning. P.s. "circuits you should know" are my favourite videos you do. And i bet im not the only one too. So never stop making videos coz we all look foward to your next posts. 😳🙏👍
I love these series! Thanks for doing it.
There was probably a need for a resistor between the buttons on the base of the transistor.
Love the electronics lesson and the humanity comments. Excellent!
Thanks, just what I was looking for as trying to add realism to models .
Exact same circuit but with the 1M across the cap and use an n-type FET. Might be best to include a 1k gate resistor but not essential. Turn off time will vary depending on FET threshold.
Hey, I know this circuit and even used it before. Thanks for reminding me,😁 I have use for it again. Thanks for the video!
Thats why I like your videos, they are clearly explained.
The playlist is awsome.
Thank you for sharing.
👍👍👍
My favorite electronics series!
Love these vids. Put me down as wanting to see a 2 stage delay vid. Thanx!
Thanks. I just discovered this. I'm looking to pulse a latching relay. I'm going over your circuits. I'm learning a lot by building the circuits and testing. Very simple parts. Great explanation.
okay this is gonna be weird and hard to explain, but i absolutely NEED this, can you make a circuit with a half second delay that then makes a half second +5v pulse?
SIR, if you put a potentiometer in place of the resister wouldn't you then have a variable control of the time and you wouldn't have to keep on changing the capacitor? Thank you for your kind presentation and your good will to the "people". Take care. - john
Keep up the series. Great refresher for all of us.
thanks for a VERY useful video on this circuit. I am going to use this as a delayed off relay in my car.
Love these simple circuits my man! Thank you for the informative content & God bless!👏👏🙌
@5:48......No you're not😂😂😂....Good Video and explanation Boss👍👍👍
So, if you replaced the switch with an IR motion detector you could use this as a motion activated night light?
That's what came to mind too.
Priceless video loved it. The rambling is superb!!!
I came here to learn, and learn stuff i did!! Subscribed now. (not quite what I needed to learn, but close... I wanted to work out how to make a sequential switcher. So when i press a momentary switch it activates a few milliseconds later a transistor switch briefly. I think i can work something out from what i learnt here. .I want a very quick, 1 second or under transistor being in closed mode.... that I don't know how to achieve. Maybe no resistor... I need to try and see.
I know I'm late but I hope you are doing okay and I pray that you will get out of CHF. Get well soon
*Three small problems:*
1. No current limiting resistor before or after the switch = large cap charging current spike = switch contact corrosion
2. NPN Transistor should have the load between ground and the transistor
3. Technically this is a Soft-Start circuit not a delay circuit. Replace the Transistor with a Schmitt-Trigger IC to build a real delay circuit like this (or a MOSFET + drain resistor).
PS: Also the switch should switch between 4.2V and Ground to improve the turn off time. Or at least put a drain resistor parallel to the capacitor
I think it would be great if you did a video, as you suggested, on a two stage delay. Mainly because you mentioned that it uses a PNP transistor which has always confounded me. Thanks for what you do!!
Really helpful for a newbie learner.....very clear thanks. How would changing the resistance between the capacitor and base effect things please? Thanks Jim uk
Good job Man. keep the videos coming, love what you be doing. ;)
Seems like a fun circuit to build with salvaged parts.
If you replace the single BJT with a Darlington pair you can get away with a much smaller cap that charges almost instantly.
Awesome thank you for taking the time to teach us.
Regards
Alan
I liked this video because it shows and explains how this circuit works! I am also wanting to know if it's possible to take this delay circuit and use it for an application that runs on 120v 60hz 2.5 amps.
3:30 This is not a completely accurate description of how this node works. You missed the very first stage of charging the capacitor to the voltage drop of the base-emitter junction (typically 0.6 ... 0.7V), before that the transistor is closed. This feature can be used to delay switching on if a resistor is added in series with the button according to the RC time constant.
Nifty circuit and at first i thought 555-timer for something like this but i like this simpler variant. Cool series showing off useful circuits. Still hoping you can do a follow up on battery voltage monitoring.
I wonder if the light technically flickers near the end. Does it make a hard transition from On to Off? I am thinking on the scale of say 5ms that there may be a ripple in the voltage to the LED due to ambient EMR that could cause the LED to flicker for a very short moment. If this is a thing, it may be more pronounced when using a larger capacitor, say one that will take an hour to discharge, as nearing the end the voltage will be within that threshold region for a longer period of time.
Could you please explain ambient EMR? Is that referring to radio interference?
@@michaelricketson1365
Yes, any wires in your circuit will act as a small antenna and develop small transient voltages as a result. Basically it puts noise into your circuit. To avoid it in areas where you want a stable voltage reading you can put a capacitor from your sensor wire to ground.
@@thedillestpickle ... Ah, thanks, I've learned something new. I've been using ceramic capacitors across the power pins of TTL chips to make up for power dips resulting from internal switching, but have not been aware of possible radio interference. Something to look for!
Hell yeah!!! Thanks a lot. Im aut!stic(high functioning), I've only halfway understood endless information I've read about Transistors, that one little statement you made finally showed me how simple it is(wonder why no one tries to explain it that way???), the base acts as a gate-valve for the channel which flows from collector to Emitter! But how is the amplified signal(in the case of audio amplification) produced at the collecter. Or is the amplified signal more so a voltage difference between the collector and the emitter, with resistor following after emitter to seperate from ground(so that the voltage on emitter side isn't 0 volts(ground)?
Hi @learnelectronics,
Thank you for the great videos.
Question: Is it possible to control the fade on and off time of the led by adding two potentiometers?
One between voltage source and resistor/led, the other between ground and...?
I followed the method you connect all the components but my led only light up when I push the switch and goes off after I released the switch button. Why is it like that? Need answer urgently. Thanks
Awesome circuit, dude! Thanks a lot! 😊
Could this possibly work as a passive unit using the hot as a source and the ground as an out?
Thanks Paul, great! I'm trying to do a solar arduino friendly delay circuit. And I'm stumped. basically I want the solar cell to charge a capacitor, into a delay circuit, and when it's delayed long enough (?) it switches on the arduino for 30 secs or so, then turns it off. Is there a simple way to do that? So all us Arduino makers can have a simple circuit to let it charge, turn it on and report, then turn it off for 5 mins or so.....
Nice and easy one.
However, you need a resitance between the capacitor and ground otherwise you are creating a "capacitor loop with no resistance"
Nice, Could you please do a soft start circuit? Have been looking for one for high voltage in the range of 400 volts with no luck, building a mono block tube amp and want to delay the plate voltage until the filaments heat up, hence prolonging tube life, I could buy a delay tube but are quite pricey as are the amp tubes, and would rather go solid state to preserve plate voltage and power. thanks a million.
wondering if the next step would be to somehow have the transistor drive the switch (replacing it with a pnp) so that it sorta flashes on and off maybe? no probably not...
Great video and no further delay
How do you calculate the delay
I am planning to use this setup to show a trigger signal
Reason: I might be fast on my reflexes but i might miss a 1 mS signal so im thinking "hold" the signal for a second or so.
will this delay be adequate or du i risk that the trigger signal is to fast to charge the capacitor?
T = RC At 1T cap loses 63.2%, depleted to 99% at 5T remember to sub the drop voltage of the transistor
the 10n is a ceramic and you have an electrolytic capacitor instead and its not even in the schematic with its marked polarity
This is a delay off but what about a delay on similar to your example of a heating circuit? NVMD found your video on it. :)
Great video but I have added Bluetooth to a speaker but I’m using the audio jack in as my audio source but for some reason the speaker needs to see the jack plug put in after about 45 seconds after switching in the speaker before it will play any sound. I need a circuit that switches on after about 45seconds so basically the reverse of this circuit. Any ideas?
Nice, but how would you do if you want the LED to be frankly on during the delay, and suddenly gets off when delay is over with only basic electronic components (no IC or any other fancy component) ?
Would this work with line level sound signals? I build horn speakers and midbass horns become too large to physically timealign with the smaller horns in the midrange and treble horns.
What about the V3205 bucket brigade delay chip?
Thanks for the video. I find it confusing when you said open up the transistor. If you take the pushbutton switch, it is normally open or not conducting until the button is pushed. Then the transistor is open or turned off until the current flows into the base, then it turns on.
Thanks.
I want to do this for a relay circuit, using a 12V DC relay. Only need it to be maintained activated for a couple seconds maybe in the event of an accidental button release (the button needs to be pressed and held to activate an intercom system using some telephones that are getting switched off of the regular telephone line which they are connected to in the NC state). How do I determine what resistors and capacitors I will need?
How could I make a switch in which a light is on persistently- then, when you press the button it turns of for 60 minutes before turning on again?
Thanks , but the timing i wanted was a little more extreme ,like 2.4 gigahertz , or an hour per push.
Then you want a bigger capacitor. I explained that in the video.
Thanks for a nifty lesson. Now, how can these same basic components be config for, a "delayed ON" circuit (ie, fridge alarm)?
Hi. I cant get any capacitors to work. What am I doing wrong. All caps are 50v 2.2uf to 100v 470uf. But caps have bin setting for a while 15years....and they check out with the multimeter.
Could a variation on this be used for an m-sync to x-sync converter? When an m-sync camera flash is used the flash bulb holder PC conector is shorted by the camera about 25mS before the shutter trips. For an electronic flash that prefiring leads to no flash when the shutter is open. The circuits I have seen have been fairly complex using an IC timer to trigger an SCR after 25 or 26 mS. Something simpler would be nice.
Awesome🎸🔊🎶how do I get the boss MZ-2 pedal to delay longer...
like it. These are circuits a enjoy watching. Keep them coming
Hi, I used this circuit with a small Pulse Generator with the LCD display that has 3 Duty Cycle adjustments. I was making one of them offset so they won't fire 2 mosfets at the same time. I had a 10uf cap. It seems the Cap blows up the generator running at 12VDC If I use a 4N25 do you think it will blow too? Thanks
Its like the timing ligths on the entry to apartments. Nice and simple if you want some on timming light string of LED's
Hey i made a Door bell circuit using this circuit. at the end when capicitor charge goes out buzzer start sounding its dying. insted of lowering (diming the led) is there any way to cut down instantly the capicitor charge signal at certain level.
Another action packed youtube video
I was thinking about something like this, but with a power (mos)fet. Would that work? I want to trigger (and retrigger) something and stay on for somewhere between 1 to 10 minutes, when moving a bicycle. So the switch will be one of those vibration switches. Current maybe 1 or 2 amps hence the fet.
Ime thinking of a non switch yet power up immediate positive signal then negative off after delay so it's going to be similar but with a pnp transistor to drive a relay coil
By saying "opening up the collector emitter voltage" do you mean operating the BJT in saturation mode?
That was a great man!! how we can make output digital 1 while the capacitor is around 5 v and 0 when discharged to around 4 v or less?
Great video! What would you change to make the delay greater?
I am looking more like timing for opposite, this is a timing off, I want a Timing on, the reason is because I want a layer of safety when a D1 mini power on some outputs does a small spike enough to activate a relay for a small time, so, I am doing a Wifi garage opener and don’t want have the chance after a power outage the garage opens by itself at the middle of the night!!
Can you please guide me what I can do? Or make a video or share the link if you already have it. Thanks a lot!!!
Very interesting. good explanation. I'm looking for a solution similar to this design. No switch. 5vdc micro-b usb in, delay 60-90 seconds, the 5vdc out. This is to delay a Raspberry pi from power up before the TV comes ready. Sure, I see the 5v-30v delay relay timer module on amazon, but like you said - where's the fun in that. Any guidance is welcomed. Thanks
How do you make a delay on?
When you push a button the delay on must start, if you push the button again the timer resets
Could I replace the button with a pir sensor, which when activated supplies current to a dc motor, and then have it turn off after 5 seconds?
Making simple circuit diagrams on squared graph paper is the technique that Forrest M Mims used when he made the Radio Shack electronics tutorial books in the 1970s and 1980s.
Could you show me how to make a mist maker using transistors?
What makes it not an RC circuit? it is still using the resistor cap relationship but the transistor allows us to Control the discharge time. is there a way to match components close to get desired time base? (range of the timer?) i tend to think of this as a timer i would combine it with a latch or Flip Flop circuit. :) which would eliminate the need for a manual Switch.
Does the capacitor charge instantly to 4.2v when you push the button, or should you hold the button down for a few seconds? Also the very long gradual dimming takes away from the usefulness of the circuit.