Yes, I am aware the LED and the battery symbols are backwards. I kind of said I really couldn't remember. If I knew the video would get this many views, I would have made sure I got the symbols correct. You could knock me over with a feather. You do know I built the world's greatest flea circus, and the videos are on my channel? I built an animatronic diorama. I built a robot. A robot! I refurbish all kinds of stuff. But obviously people like learning how to make things remote control. Shows how much I know about this RUclips stuff.
459 videos over 14 years, and all of it magical, literally and electronically! You have some great, great work. Don't let the needless critics bother you, they likely haven't done anything like you've accomplished. Cheers, and I looking forward to your videos, always...
I was doing very poorly on electronics classes. i wish i had someone this clear to explain things to us. We need more of these content than the universities and colleges.
as a model maker where we are trying to bring lighting and electrical features to models, but in as simple cheap and small way as possible, this loooks like a superb solution. thank you again for a brilliant videa.
79 year old elec tech here. Ray MItchel is correct you should use a diode instead of a capacitor to clamp the back emf. In fact the diode will cause the motor to stop instantly since it acts like a direct short across the motor when it tries to "Generate" a voltage in the reverse direction..... Thanks for informing us about the RX480 ! 😁
I agree without the diode on the coils and motors you will get a large voltage spike when it turns off that can damage your circuits. Note the Cap is a good Idea for electrical noise while the motor is running
I went through an electronics school in the Navy 35 years ago. I have used the basic knowledge throughout my life, but have never created a project. Thank you for sharing a project without going into too much detail on sizing. You are a very good teacher. New Sub
Hi, from Uruguay, I congratulate you for you clear explanation and the way that you speak make easier to understand for people that English is not our main language. Thanks!!!
Well Randi you don't need me to tell you how clever you are, the biggest thing here is that you explained all this in a way that I actually think I understood it, also your cool low key aproach is a very refreshing change from the back to front cap loud and brash types that seem to think we like to be shouted at.
This is the first time I have ever seen anyone teach me electronics in such an understandable way! You are great! Thank you so much you earned a subscriber.
Years ago I studied electronics and learned everything as you mentioned You were very clear and for anyone should comprehend You remind me of some of my teachers who were also very clear, Well done,
Wow, this is the kind of stuff that would inspire me when I was a kid. Visual learning with solid examples. Yea, maybe there’s a boo boo here and there, but that’s part of the learning process.
I would also put a flyback diode across any inductor source such as a motor or relay coil to discharge the inductor kick the motor or relay coil generates as the field collapses when power is removed.
I agree without the diode on the coils and motors you will get a large voltage spike when it turns off that can damage your circuits. Note the Cap is a good Idea for electrical noise while the motor is running
This is great. I did electronics years ago in service. Now I'm ready to tackle a garage door open sensor project. Videos like this are bringing back that electronics 'muscle memory'. Thank you.
What an awesome video. I am restoring an RC fire boat upgrading it to hobby grade. I trashed the corroded electronics already. I have plans to add working spotlights and other assories to it. Watching this video has given me ideas. Thankyou for making a simplified video that will help me in my project.
I bet I could have turned to be better than what I am today, if only I had a teacher like you. Thanks for the video with practicals, rough sketch and the actual work done here!!!
Thank you very much. I wish someone would have explained it like this to me twenty years ago. That's about how long it took me to figure it out on my own.
For someone who calls herself a magician, you are one heck of a good electronics instructor. Hope to see more electronics videos from you. I don’t think I could do a better job myself. Kudos to you! Nice work!
I just learned all kinds of good stuff! This is absolutely something that someone with little to no experience could do because you made it so easy to understand and follow along. Thank you!
Great, your explanation enriches the use of this module. We have collected your video in the excellent video collection of RX480E. Thank you for your contribution! Let the module be more convenient for more people to use!
In the case of the solenoid or a relay, they are really inductors which produce a high voltage when switched off. Basically they oppose a change in current flow so when you switch off, it tries to suck current through the switch, resulting in a high voltage. You really should place a diode across the terminals to prevent damage to the switching transistor. It needs to be oriented so it does not bypass the current through the coil in normal operation. Therefore the current is drawn throught diode and allows energy to be dissipated without damaging anything.
Thanks for that video. I used to try and play with electronics some but never fully understood those simple things like you just explained. You explained how that worked and why so simply that I got it! I think the application part is where I failed to connect the dots in the past and this connected the dots.
Nicely explained thanks a lot, As i recently came across so many tutorials on this module but didn't find any information about my required application. But now my doubts are clear after watching this tutorial, again many many thanks.
Haha! That's wierd I have that exact motor that I bought for a tobacco grinder, but before I built that I quite smoking! SO I still have the motor sitting here trying to find something to do. This gave me some ideas, thanks! These RF units are far superior to the ones I was using 10 years ago too. Need to invest in some cheers!
Awesome video!! I wish my teachers would've taught like this. Thank you so much!! Most videos seem over explain certain aspects and dont touch on others at all! Love how you showed multiple applications and what works what doesnt and why!!! Would love if you did something like a wireless intercom. Subscribed.
She explains things in an easy way for beginners, or like me, I studied electronics but I have not practiced and barely know commercialized components.
You explain it so simple, for any one to understand. I wish I had you as a teacher long time ago. Thanks a lot. Can you make some videos about the different electronic devices, their properties and when and how to use them in useful circuits?? 🙏🏻🙏🏻🙏🏻
Thank you for this. The RX480E is really easy to use, more people should know about it! I used it to make a TAC2 joystick wireless, and together with a Raspberry Pi I have a cool little C64 emulator.
For the inductive loads, you need to connect a DIODE in reverse across the coil. I'm not quite sure why you use a capacitor. Also these loads (relay, solenoid, motor...) really need to be run on something with much more capacity than a typical 9v battery...especially if they are 'latched' on! This will deplete such a battery in short order. OVERALL...NICE VIDEO!!
I loved this practical explanation; first with the circuit diagram & then with the breadboard. The fact that I could follow what you were saying & understand it makes you a good teacher. If I want to build this circuit then it is up to me to make sure & check that I get everything the right way round. So ignore the nit pickers.
When switching an inductive load such as a solenoid you need a reversed biased diode across it to absorb high voltage spikes which wiil eventually destroy the transistor. Search 'snubber diode ' for the circuit.
Great video as always , just remember these are totally unprotected and unencrypted so not really safe to use on anything important or something you don't want someone messing with. My friend waited outside my shop one evening and got my shutter down command....now likes to scare the crap out of me while outside having a smoke break.
@@RandiRain Yea our shutters don't and either does the one on my Diesel heater , but some do and there are ways to hack but you really would want to risk jail time to go about hacking them, but I'd still not have one remote my front door or something I don't want hacked. My friend hates them as he's very old school and says in his car driving thru town some days his cb radio screams at him. His own fault for having it turned up so loud!
Buena explicación, gracias por compartir, gracias por ponerlo en idioma español 😊 un suscriptor mas 😊. Me gustó mucho su lista de personas a las que agradece también, muchas bendiciones y éxitos en este nuevo 2025 😁😁👍🏽👍🏽
Kool vid. Thanks for your personal insight into this. Some transistors 'latch' rather easilly. Meaning just the capacitance of your finger in the circuit on the base can enable the transistor, meaning it stays 'on' so long as there is voltage / current present. So it would remain on, even with no signal on the IO pin after it was pulsed a single time. secondly, Keep in mind, IF the load was a coil in a relay, solenoid, motor etc, that is to be energized / de-energized, a capacitor is not the most effective way to snub that. When the field decays, it causes an EMF surge to be induced in the circuit in the reverse direction. Those voltage spikes can be devastating to devices upstream. While a small cap will absorb some of that, a reversed biases diode should be used across the coil to shunt that extra voltage to ground. A TVS diode would likely be a good choice. That is the theory anyway. Someone else with more experience can clarify that :)
That was really well done. You have a great way of teaching and making things that could be complex very simple. Well done. If you do more videos like this I will definitely watch them.
Thank you very, very much. Somebody needed to make this video, and you did an excellent job explaining many details. I really thought you were going to suggest a relay for controlling a 12v motor. Im now curious about using a transistor for this application. Regardless i really appreciate your tutorials. 👍 subscribing to Randi Rain is one of the best decisions I've made in years.
Interesting tutorial. Several years ago I used a simple on/off remote (from eBay) to signal when mail arrived as our postal mailbox is on the other side of the street.
@@RandiRain Guess I didn't save my post from yesterday. Our house is 600 ft from the road. I used a simple on/off RF remote (eBay). I installed the transmitter in a waterproof box at the mailbox and added some circuitry to simulate pressing the buttons and used a mag reed switch on the door. We have three utility poles along the driveway and mounted to receive on the pole nearest the road. We are lucky and have been able to get fiber internet so I was able to repurpose the old copper phone line to connect house to receiver. I used a simple microcontroller to illuminate a led in the kitchen when mail arrives and a pushbutton to reset it. It also resets automatically over night to get ready for the next day. It sends a text to my phone when mail arrives.
Nice demonstration - right to the point. The only thing I would add, which I don't think you covered is that for anything electormagnetic it is not just noise but also the turn-off spike that is a problem. A diode across the load is much better to suppress that. A capacitor can do it, but you need to calculate how much energy you need to absorb to know how big a capacitor you need. The diode kind of works like the free-wheel on a bike - it just absorbs as much spike as there is. Those TIPs are a lot chunkier than necessary for a relay so are quite forgiving, but typically, if you drive a relay or solenoid with a transistor and you don't have something to suppress the turn-off spike, the transistor will die the first time you turn it off, or potentially worse, it will fail after just a few minutes of use.
I'm pretty sure I talked about how a motor still turns after the power is removed, which makes it act like a generator. That's usually how I explain it. I've never had an issue using the TIPs, and I've not had anything on them before. No cap, no diode, and it was just fine. It depends on how nice the motor is. I've built many things with them. A lot have videos right here on my channel.
@@RandiRain Yeah, I eventually saw a comment lower down saying the TIPs have a built-in suppressor - so that makes it a really good choice of transistor. You would not get away with it using a transistor that didn't have this. You did mention the generator thing, and the cap is good for that. But the spike from a de-energising relay is much more problematic than the generator effect (theoretically the max voltage from a relay is infinite, the spike just keeps rising "until something starts conducting", which often means "until something breaks")
In general terms, it's also where you have a DC circuit, but there *may* be some AC there, after rectification for example ... the Cap will allow the AC wave to pass through it. I think this is why they call them filter caps, so it's not just for buffering reverse EM, but eliminating noise ... Even need them on 555 timers, super close!
Well A New "turn on" for me has just been unlocked: Women explaining electronics.. lol but kidding aside, I found the pace of your explaining things and your honesty humbleness and attitude to be therapeutic as much as informative. Thank you! 👍🏼
Haha, this is a great little video! Very helpful. Thanks for introducing us to the RX480E. Slick little chip there. Compliments, you have cracked electronics without formal training, and it's refreshing. (Once again we see that the instructional videos get the views!)
This is probably the same circuit in a box I bought from Amazon to control one of my garage doors where the remote failed. It comes in a nice white box with screw terminals and an antenna wire. It's got a full wave bridge on the power so you can connect ANY wall wart that's >6v without regard to AC or DC or polarity. I just wired one of the relay channels in parallel to the push button switch and problem solved.
Do you also need a flyback diode to stop backfeed to the transistor on the collector? You definitely need one for the mechanical relay and it wouldn't hurt to have an optoisolator there too!
@@NickBR57 Based on - give us a case example where you have seen or had a failure? Please don't just assume something is required, because you have seen it before? Too much, what is called, duck following, maybe sheep? I have built keying circuits for Heath SB220 amplifier using no diode, but, be sure to select proper transistor. See, it comes down to engineering. Know the limits, make proper selection, or, just "test" it. QED. Thanks.
@uploadJ Not possible to add circuit diagrams to comments but as an engineer who got my electronics degree in 1978 and have decades working with electronics, I have seen quite a few examples of failure due to back EMF. If you have not, maybe you are lucky or maybe you less experienced. In either case theres no call to try to be offensive, even if its water off a "duck's" back.
This is pretty interesting ... I have 2 different brands one from walmart and another a more mainstream outlet I think I bought at homedepot. I like them except that I have to have 2 remotes, and you HAVE TO USE THE REMOTES. I've had an idea of using cheap IR remotes ( you can buy them by the ton cheaply ) and then program an IR receiver and arduino or some such to turn lights on / off.
this has so many applications,. thanks i love ur style + passion,. (just add music,. bc more is better,. noooo,lol,.jkjk ur voice is music)THX 4 the CC,. u r amazing,.
Wait magic, in this case you did not let the "magic smoke" out of those components. 👍 What is really great about Randi Rain is the videos are real, the magic is in the devices. Most you-toobers need to watch and learn from her.
Excellent video despite the errors that many would fault in. I'm late in the game. Wanting Arduino or Pi things to play with. LiDar and Graviton particle propulsion.
LOL now beautiful lady your video is successful and what people say about the schematic signs, don't worry about that, if people want to copy this it should work. I also understood everything and can now make this if I want. ( electronics is my hobby ) all the best wishes from the Netherlands! Rob
In the case of the solenoid or a relay, and DC Motors, they are really inductors which produce a high voltage when switched off. Basically they oppose a change in current flow so when you switch off, it tries to suck current through the switch, resulting in a high voltage. Motors do also act as generators and the problem is similar but the voltage won't be higher than the supply that was driving it (normally) You really should place a diode across the terminals to prevent damage to the switching transistor. It needs to be oriented so it does not bypass the current through the coil in normal operation. Therefore the current is drawn throught diode and allows energy to be dissipated without damaging anything.
Just one correction: Not a capacitor in parallel with that transistor, you need a diode to short that huge EMF reverse polarity spike. Good work overall though.
Yes, I am aware the LED and the battery symbols are backwards. I kind of said I really couldn't remember.
If I knew the video would get this many views, I would have made sure I got the symbols correct.
You could knock me over with a feather.
You do know I built the world's greatest flea circus, and the videos are on my channel?
I built an animatronic diorama. I built a robot. A robot! I refurbish all kinds of stuff.
But obviously people like learning how to make things remote control.
Shows how much I know about this RUclips stuff.
459 videos over 14 years, and all of it magical, literally and electronically! You have some great, great work. Don't let the needless critics bother you, they likely haven't done anything like you've accomplished. Cheers, and I looking forward to your videos, always...
Tech. You Need A Blocking Diode on A Solenoid For The EMF Feed Back .... Just Found Your Ch New Sub
Just don't get offended. Relax and improve. I love the way you explained and it's so cool ❤
Is there a phone app that can be easily connected to those devices?
I’m only 7 minutes in and I love your channel already. Subscribed.
I was doing very poorly on electronics classes. i wish i had someone this clear to explain things to us. We need more of these content than the universities and colleges.
7:00 probably one of the clearest & most succinct explanations of using a transistor to turn a motor on/off. Thanks for the great explanation.
The Right person can teach us anything.
If only more people could be so pragmatic. Really straightforward and practical. Thanks for posting.
💯 Three adjectives that perfectly describe it. I subscribed today.
as a model maker where we are trying to bring lighting and electrical features to models, but in as simple cheap and small way as possible, this loooks like a superb solution. thank you again for a brilliant videa.
That kind of stuff is perfect for this circuit. You wouldn't want it to safeguard your house or anything, but it's perfect for what you want to do.
A real teacher at work, and knows how to explain things. Thank you Ma'am
79 year old elec tech here. Ray MItchel is correct you should use a diode instead of a capacitor to clamp the back emf. In fact the diode will cause the motor to stop instantly since it acts like a direct short across the motor when it tries to "Generate" a voltage in the reverse direction..... Thanks for informing us about the RX480 ! 😁
I agree without the diode on the coils and motors you will get a large voltage spike when it turns off that can damage your circuits.
Note the Cap is a good Idea for electrical noise while the motor is running
I went through an electronics school in the Navy 35 years ago. I have used the basic knowledge throughout my life, but have never created a project. Thank you for sharing a project without going into too much detail on sizing. You are a very good teacher.
New Sub
I wish more channels would explain things without over complications.
You have a new sub.
Hi, from Uruguay, I congratulate you for you clear explanation and the way that you speak make easier to understand for people that English is not our main language. Thanks!!!
Well Randi you don't need me to tell you how clever you are, the biggest thing here is that you explained all this in a way that I actually think I understood it, also your cool low key aproach is a very refreshing change from the back to front cap loud and brash types that seem to think we like to be shouted at.
This is the first time I have ever seen anyone teach me electronics in such an understandable way! You are great! Thank you so much you earned a subscriber.
Years ago I studied electronics and learned everything as you mentioned
You were very clear and for anyone should comprehend
You remind me of some of my teachers who were also very clear,
Well done,
Wow, this is the kind of stuff that would inspire me when I was a kid. Visual learning with solid examples. Yea, maybe there’s a boo boo here and there, but that’s part of the learning process.
This was a really good tutorial. I absolutely enjoyed it and learnt plenty. I will try this project.
I would also put a flyback diode across any inductor source such as a motor or relay coil to discharge the inductor kick the motor or relay coil generates as the field collapses when power is removed.
I agree without the diode on the coils and motors you will get a large voltage spike when it turns off that can damage your circuits.
Note the Cap is a good Idea for electrical noise while the motor is running
Finally, one of your videos got the views it deserves 💪
This is effing unbelievable! I've been looking for something like this for SO long. Raandi, you are the friggin' bomb! Thank you...
Thank you for explaining this to those of us who are not that electronically knowledgeable.
👍😎
This is great. I did electronics years ago in service. Now I'm ready to tackle a garage door open sensor project. Videos like this are bringing back that electronics 'muscle memory'. Thank you.
Just finished my ELEC 101 class. Amazing teaching style/format and practical application demo. More please!
What an awesome video. I am restoring an RC fire boat upgrading it to hobby grade. I trashed the corroded electronics already. I have plans to add working spotlights and other assories to it. Watching this video has given me ideas. Thankyou for making a simplified video that will help me in my project.
I bet I could have turned to be better than what I am today, if only I had a teacher like you. Thanks for the video with practicals, rough sketch and the actual work done here!!!
This is such clear teaching. Great work
Thanks Randi! Your videos are always inspiring and so genuine.
Thank you very much. I wish someone would have explained it like this to me twenty years ago. That's about how long it took me to figure it out on my own.
For someone who calls herself a magician, you are one heck of a good electronics instructor. Hope to see more electronics videos from you. I don’t think I could do a better job myself. Kudos to you! Nice work!
I just learned all kinds of good stuff! This is absolutely something that someone with little to no experience could do because you made it so easy to understand and follow along. Thank you!
My goodness but that was an amazing tutorial!
Great run through! Glad you caught the misplaced Emitter connection 😎🙏
Great, your explanation enriches the use of this module.
We have collected your video in the excellent video collection of RX480E.
Thank you for your contribution!
Let the module be more convenient for more people to use!
In the case of the solenoid or a relay, they are really inductors which produce a high voltage when switched off. Basically they oppose a change in current flow so when you switch off, it tries to suck current through the switch, resulting in a high voltage.
You really should place a diode across the terminals to prevent damage to the switching transistor. It needs to be oriented so it does not bypass the current through the coil in normal operation. Therefore the current is drawn throught diode and allows energy to be dissipated without damaging anything.
An excellent clear and concise explanation. Love that you have an old school Arm-a-tron on one of your shelves.
I just loved watching and learning. Thank You
Thanks for that video. I used to try and play with electronics some but never fully understood those simple things like you just explained. You explained how that worked and why so simply that I got it! I think the application part is where I failed to connect the dots in the past and this connected the dots.
I just found you and subscribed. Glad this popped up. Very clear and informative.
Really well presented...
Excellent 👍
definitely worth a rewatch. The demonstrations were very useful.
Wow, great demonstration! I need to remember this.
Nicely explained thanks a lot, As i recently came across so many tutorials on this module but didn't find any information about my required application. But now my doubts are clear after watching this tutorial, again many many thanks.
Haha! That's wierd I have that exact motor that I bought for a tobacco grinder, but before I built that I quite smoking! SO I still have the motor sitting here trying to find something to do. This gave me some ideas, thanks! These RF units are far superior to the ones I was using 10 years ago too. Need to invest in some cheers!
Can you do more electronic videos like this to teach us please 🙏. You are a great teacher.
Awesome video!! I wish my teachers would've taught like this. Thank you so much!! Most videos seem over explain certain aspects and dont touch on others at all! Love how you showed multiple applications and what works what doesnt and why!!! Would love if you did something like a wireless intercom. Subscribed.
Electrical engineer here. Nice presentation. Thanks!
thank you for that easy explanation for the circuit and the component of it also for the highlighting the use of it. love to see more
Best teacher for electronics.
Thank you.
sounds like sarcasm :P lol
Is she into electronics. I hardly see women in the field
She explains things in an easy way for beginners, or like me, I studied electronics but I have not practiced and barely know commercialized components.
Mother of Electronics 😂
As an electronic engineer I like what I see!
You explain it so simple, for any one to understand.
I wish I had you as a teacher long time ago.
Thanks a lot.
Can you make some videos about the different electronic devices, their properties and when and how to use them in useful circuits??
🙏🏻🙏🏻🙏🏻
Thank you for this. The RX480E is really easy to use, more people should know about it! I used it to make a TAC2 joystick wireless, and together with a Raspberry Pi I have a cool little C64 emulator.
That's cool.
A lot of electronics explained here, thank you for this lesson!
For the inductive loads, you need to connect a DIODE in reverse across the coil. I'm not quite sure why you use a capacitor. Also these loads (relay, solenoid, motor...) really need to be run on something with much more capacity than a typical 9v battery...especially if they are 'latched' on! This will deplete such a battery in short order.
OVERALL...NICE VIDEO!!
I loved this practical explanation; first with the circuit diagram & then with the breadboard. The fact that I could follow what you were saying & understand it makes you a good teacher. If I want to build this circuit then it is up to me to make sure & check that I get everything the right way round. So ignore the nit pickers.
When switching an inductive load such as a solenoid you need a reversed biased diode across it to absorb high voltage spikes which wiil eventually destroy the transistor. Search 'snubber diode ' for the circuit.
TIP series devices have the diode built in.
Great video, straight to the point and clear.
Great video as always , just remember these are totally unprotected and unencrypted so not really safe to use on anything important or something you don't want someone messing with. My friend waited outside my shop one evening and got my shutter down command....now likes to scare the crap out of me while outside having a smoke break.
This is true. I do believe they have the rolling code, but that's not hard to get around.
@@RandiRain Yea our shutters don't and either does the one on my Diesel heater , but some do and there are ways to hack but you really would want to risk jail time to go about hacking them, but I'd still not have one remote my front door or something I don't want hacked. My friend hates them as he's very old school and says in his car driving thru town some days his cb radio screams at him. His own fault for having it turned up so loud!
simple language, straight forward application descriptions.... Thanks !
that is a well explained tutorial for newbies like myself
thanks
Great well explained video that makes it easy to understand.
Buena explicación, gracias por compartir, gracias por ponerlo en idioma español 😊 un suscriptor mas 😊. Me gustó mucho su lista de personas a las que agradece también, muchas bendiciones y éxitos en este nuevo 2025 😁😁👍🏽👍🏽
Kool vid. Thanks for your personal insight into this.
Some transistors 'latch' rather easilly. Meaning just the capacitance of your finger in the circuit on the base can enable the transistor, meaning it stays 'on' so long as there is voltage / current present. So it would remain on, even with no signal on the IO pin after it was pulsed a single time.
secondly, Keep in mind, IF the load was a coil in a relay, solenoid, motor etc, that is to be energized / de-energized, a capacitor is not the most effective way to snub that. When the field decays, it causes an EMF surge to be induced in the circuit in the reverse direction. Those voltage spikes can be devastating to devices upstream. While a small cap will absorb some of that, a reversed biases diode should be used across the coil to shunt that extra voltage to ground. A TVS diode would likely be a good choice. That is the theory anyway.
Someone else with more experience can clarify that :)
RUclips recommended your channel... you're doing hobbyist electronics and that's so awesome.
When I built my first robot I was looking at something similar great idea!❤
That was really well done. You have a great way of teaching and making things that could be complex very simple. Well done. If you do more videos like this I will definitely watch them.
This was oddly relaxing to watch. 👍
Thank you very much for taking the time to do this. I have always wanted to find a simple way to do this.
Been about 40 years, but as I recall, fly back spike protection from the motor coils such as a zener diode might be a fine addition.
from across the pond, thank you super video
Hi there, this is a little kit I would love to put together for nieces nephews and grand children. Thank you.
Thank you very, very much. Somebody needed to make this video, and you did an excellent job explaining many details. I really thought you were going to suggest a relay for controlling a 12v motor. Im now curious about using a transistor for this application. Regardless i really appreciate your tutorials. 👍 subscribing to Randi Rain is one of the best decisions I've made in years.
Excellent demonstration!
Great how you explained the transistor!
I genuinely learned something from this. Great job. I will be using these in some projects of my own.
That's great. I'm glad it helped.
Interesting tutorial. Several years ago I used a simple on/off remote (from eBay) to signal when mail arrived as our postal mailbox is on the other side of the street.
I've thought of doing that for my brother who lives in the country and the mailbox is a good walk.
@@RandiRain Guess I didn't save my post from yesterday. Our house is 600 ft from the road. I used a simple on/off RF remote (eBay). I installed the transmitter in a waterproof box at the mailbox and added some circuitry to simulate pressing the buttons and used a mag reed switch on the door. We have three utility poles along the driveway and mounted to receive on the pole nearest the road. We are lucky and have been able to get fiber internet so I was able to repurpose the old copper phone line to connect house to receiver. I used a simple microcontroller to illuminate a led in the kitchen when mail arrives and a pushbutton to reset it. It also resets automatically over night to get ready for the next day. It sends a text to my phone when mail arrives.
Nice demonstration - right to the point. The only thing I would add, which I don't think you covered is that for anything electormagnetic it is not just noise but also the turn-off spike that is a problem. A diode across the load is much better to suppress that. A capacitor can do it, but you need to calculate how much energy you need to absorb to know how big a capacitor you need. The diode kind of works like the free-wheel on a bike - it just absorbs as much spike as there is. Those TIPs are a lot chunkier than necessary for a relay so are quite forgiving, but typically, if you drive a relay or solenoid with a transistor and you don't have something to suppress the turn-off spike, the transistor will die the first time you turn it off, or potentially worse, it will fail after just a few minutes of use.
I'm pretty sure I talked about how a motor still turns after the power is removed, which makes it act like a generator. That's usually how I explain it. I've never had an issue using the TIPs, and I've not had anything on them before. No cap, no diode, and it was just fine. It depends on how nice the motor is. I've built many things with them. A lot have videos right here on my channel.
@@RandiRain Yeah, I eventually saw a comment lower down saying the TIPs have a built-in suppressor - so that makes it a really good choice of transistor. You would not get away with it using a transistor that didn't have this. You did mention the generator thing, and the cap is good for that. But the spike from a de-energising relay is much more problematic than the generator effect (theoretically the max voltage from a relay is infinite, the spike just keeps rising "until something starts conducting", which often means "until something breaks")
In general terms, it's also where you have a DC circuit, but there *may* be some AC there, after rectification for example ... the Cap will allow the AC wave to pass through it.
I think this is why they call them filter caps, so it's not just for buffering reverse EM, but eliminating noise ... Even need them on 555 timers, super close!
Well A New "turn on" for me has just been unlocked: Women explaining electronics.. lol but kidding aside, I found the pace of your explaining things and your honesty humbleness and attitude to be therapeutic as much as informative. Thank you! 👍🏼
Very very clear! You're more than a magician!
Haha, this is a great little video! Very helpful. Thanks for introducing us to the RX480E. Slick little chip there. Compliments, you have cracked electronics without formal training, and it's refreshing. (Once again we see that the instructional videos get the views!)
I never knew that corrosion originates from the negative terminal! Thank you!
You're essentially electroplating the elements in the air. When electroplating, you connect the object you want to plate to negative.
This is probably the same circuit in a box I bought from Amazon to control one of my garage doors where the remote failed. It comes in a nice white box with screw terminals and an antenna wire. It's got a full wave bridge on the power so you can connect ANY wall wart that's >6v without regard to AC or DC or polarity. I just wired one of the relay channels in parallel to the push button switch and problem solved.
Do you also need a flyback diode to stop backfeed to the transistor on the collector? You definitely need one for the mechanical relay and it wouldn't hurt to have an optoisolator there too!
ONLY if the back EMF creates a problem, and often it can if the driving transistor can't take the momentary back EMF ...
@uploadJ For general use there is nothing to lose and potentially much to be gained from having a protection diode.
@@NickBR57 Based on - give us a case example where you have seen or had a failure? Please don't just assume something is required, because you have seen it before? Too much, what is called, duck following, maybe sheep? I have built keying circuits for Heath SB220 amplifier using no diode, but, be sure to select proper transistor. See, it comes down to engineering. Know the limits, make proper selection, or, just "test" it. QED. Thanks.
@uploadJ Not possible to add circuit diagrams to comments but as an engineer who got my electronics degree in 1978 and have decades working with electronics, I have seen quite a few examples of failure due to back EMF.
If you have not, maybe you are lucky or maybe you less experienced. In either case theres no call to try to be offensive, even if its water off a "duck's" back.
@@uploadJ give the attitude a miss.
Nice one! Exactly what I need for my cat door closer!
That's a fantastic way to explain transistors. Thank you
Glad it was helpful.
nice video. But if your load is inductive device such as a relay or motor then you have to put a Flyback diode for protect your switching transistor.
This is pretty interesting ... I have 2 different brands one from walmart and another a more mainstream outlet I think I bought at homedepot. I like them except that I have to have 2 remotes, and you HAVE TO USE THE REMOTES.
I've had an idea of using cheap IR remotes ( you can buy them by the ton cheaply ) and then program an IR receiver and arduino or some such to turn lights on / off.
this has so many applications,. thanks i love ur style + passion,. (just add music,. bc more is better,. noooo,lol,.jkjk ur voice is music)THX 4 the CC,. u r amazing,.
Mesmerized by your magic!
Wait magic, in this case you did not let the "magic smoke" out of those components. 👍 What is really great about Randi Rain is the videos are real, the magic is in the devices. Most you-toobers need to watch and learn from her.
Excellent video despite the errors that many would fault in.
I'm late in the game.
Wanting Arduino or Pi things to play with.
LiDar and Graviton particle propulsion.
Great job , thanks for sharing 👍
Great Video - concise, well thought out - to the point
Great job dude ❤❤❤
its a dude right?
dude
Thanks, didn't know there was a simple circuit like that.
It's my fav.
Wonderful. Thank you!
LOL now beautiful lady your video is successful and what people say about the schematic signs, don't worry about that, if people want to copy this it should work.
I also understood everything and can now make this if I want. ( electronics is my hobby ) all the best wishes from the Netherlands! Rob
Excellent explanation Randi. More magical electronic circuits would be awesome.
Very good practical, thanks
Great Video , put a 1N4007 in place of Cap
In the case of the solenoid or a relay, and DC Motors, they are really inductors which produce a high voltage when switched off. Basically they oppose a change in current flow so when you switch off, it tries to suck current through the switch, resulting in a high voltage. Motors do also act as generators and the problem is similar but the voltage won't be higher than the supply that was driving it (normally)
You really should place a diode across the terminals to prevent damage to the switching transistor. It needs to be oriented so it does not bypass the current through the coil in normal operation. Therefore the current is drawn throught diode and allows energy to be dissipated without damaging anything.
As always another great video!
Just one correction: Not a capacitor in parallel with that transistor, you need a diode to short that huge EMF reverse polarity spike. Good work overall though.
It worked on both my wife _and_ my teenage stepson.