+subscriber +today i learned why not to connect transistor Base directly from variable resister - to protect it. +Why we need second transistor - to supply enough current to relay so it will work properly. ❤❤ thanks alot
hey and thank for th vedio I want the counter start to count when I relase my finger or cut the power? I mean i want it delay off.. when i press power the light turn on and it countinus lighting until I cut power off then the light turn off after 5second
Really nice video. I'm learning electronics and find videos like these a really useful way of getting a handle on component relationships. I'm at the gear/steering wheel/brake/handbrake/clutch phase where if I focus on one all the rest go to pot. Even though the circuit is quite basic the load/current flow needs a bit of thinking about.. Out of interest how would this circuit be different if a MOSFET were used instead of BJT. If in fact relevant in the configuration.
Just for interest, this is kinda how a 555 timer i.c. would work. (I don't know much about electronics stuff). I think it's basically a RC timer circuit, which you're probably familiar with.
Would it be possible to make a much larger delay. Like for example a 3h delay? Also thank you for the good explanation this was just what I was looking for :)
Will the current drawn affect the amount of time of the relay stays on? For example, having more than 1 light Connected or something else that draws more current
You can't really use RC delays for things like 180 minutes because variations from temperature and supply voltage will affect the timing constant. You need an oscillator and a counter.
Your best bet would be to leave the resistors as in the video, but use a very large capacitor. It will still be very inaccurate and depends on the quality of the capacitor, it may destroy the switch when you press it ( add a resistor in series with the switch, maybe 100 ohm or so). The best solution would be to use a digital timer or microcontroller.
@@mkowitz Yes, Electrons are negatively charged, and collect or are condensed at a conductive surface creating a negative charge. When a battery is delivering its energy, the electrons are flowing from the negatively, electron rich side of the conducting material, toward the positively charged surface, that lacks electrons. They seek balance, that is the nature of electron interaction, to be surrounding a balanced conductive atom. To be conductive, suggests the electron cloud can easily accept and lose an electron. A string of these atoms allows electrons to easily jump from atom to atom in a steady flow, attempting to populate the moving electrons onto the material that lacks or is missing electrons at the end of the line; until an equilibrium is reached between the negative and positive sides. The simplest example is the voltaic pile. It uses an acid and two plates, one zinc and one copper. The acid dissolves the zinc which gives off two electrons, the zinc becomes an ion, travels to the copper, and steals two more electrons and brings them back to the zinc. Basically a build up occurs of electrons on the zinc plate. These electrons can be dumped back over to the copper plate through a circuit. Im not an expert, Im a tattoo artist, but thats the gist.
@@ludicscience LOL :) They're fun, a bit painful, but worth it if the design fits the body and is genuinely artistic. I like circuits... just learned to design pcb's in Eagle, working on a new product line of S.T.E.M. toys and gadgets! I enjoy your videos, I like to see the various ways components can function together to solve a problem.
JLCPCB is a great price if your ordering a lot of boards. If your just needing a quick prototype in the U.S., OshPark is a 5 day turn around. 3 boards, 1"square, about $5 total, free shipping.
I did try to make this circuit using a 5v relay and 5v input power but the circuit was unstable. The relay would not energize. I don’t understand how the second transistor with no base resistor can act as a switch. The rush of unrestricted current from the positive supply into its base when the first transistor turns on should send it into orbit not saturation. One downside of this author is that he rarely responds to your questions!!
Very clear explanation, thank you!
Thanks for sharing your knowledge!!
your explanation is great . thanks .
Excellent Explanation❤❤❤❤
thank you, very informative video
+subscriber
+today i learned why not to connect transistor Base directly from variable resister - to protect it.
+Why we need second transistor - to supply enough current to relay so it will work properly.
❤❤ thanks alot
neat little circuit! thanks ;)
I like it. Thanks.
Thanks for the good video
hey and thank for th vedio
I want the counter start to count when I relase my finger or cut the power?
I mean i want it delay off..
when i press power the light turn on and it countinus lighting until I cut power off then the light turn off after 5second
Can i make this circuit for 1 hour on time then what will be the capacitor or resistor value
Really nice video. I'm learning electronics and find videos like these a really useful way of getting a handle on component relationships.
I'm at the gear/steering wheel/brake/handbrake/clutch phase where if I focus on one all the rest go to pot.
Even though the circuit is quite basic the load/current flow needs a bit of thinking about..
Out of interest how would this circuit be different if a MOSFET were used instead of BJT. If in fact relevant in the configuration.
Just for interest, this is kinda how a 555 timer i.c. would work. (I don't know much about electronics stuff). I think it's basically a RC timer circuit, which you're probably familiar with.
For changing timd values
You can use this equation
T=5t
T=5(capacitor in farad * resistor in ohm)
T in seconds ?
@@MrYeshwanthlnyes
Would it be possible to make a much larger delay. Like for example a 3h delay?
Also thank you for the good explanation this was just what I was looking for :)
Hello. You have no Gerber file or the complete PCB to buy from you?
Can this circuit be adapted to turn on and off at set times? Every 5 seconds say? Thanks
Thanks.i need like it with triaks
Very cool.
👍
bom trabalho
Will the current drawn affect the amount of time of the relay stays on? For example, having more than 1 light Connected or something else that draws more current
No
i just got a burned bjt , isn't the second bjt getting 12v on the base with this set up ? correct me if i'm wrong . i used a BC547
I think your resistor you used in the base are lower than 40k
does it work with 12 volts too???
Pretty much useful....
Thanks
like
@@ludicscience Hello Sir, can you show the exact connection on the breadboard please? Thank you for the reply 👍🏽
how to order pcb
it is confusing vedio .the diagram does spicify were the input will also where the load be connected. i tried it failed why?
Great . hello everyone wish you all the best
Greetings from Brazil to all. I have BC546 transistors. should work well. or not??? very good. success.
yes they work abração!
on bc547?
What is the value of caps and resistance for a delay ie on time for 3hrs ie. 180mins/ 10800sec
Thanks in advance😊😊
Use a microcontroller instead for large time.
You can't really use RC delays for things like 180 minutes because variations from temperature and supply voltage will affect the timing constant. You need an oscillator and a counter.
Thanks for the replay@@keepcool5945 but I need things to be in analog.
Thanks @@Peter_S_ Can u please explain it, if possible with ckt, keeping in mind that we are working with only analog.
Your best bet would be to leave the resistors as in the video, but use a very large capacitor.
It will still be very inaccurate and depends on the quality of the capacitor, it may destroy the switch when you press it ( add a resistor in series with the switch, maybe 100 ohm or so).
The best solution would be to use a digital timer or microcontroller.
Please explain how electrons flow from the positive to the negative terminals of the battery (?)
If you want to learn about the electron paths through various components of circuitry, check out this guy:
ruclips.net/user/EugeneKhutoryansky
My point exactly! He shows current (electrons) from the negative terminal of the battery, through the circuit, to positive!
@@mkowitz Yes, Electrons are negatively charged, and collect or are condensed at a conductive surface creating a negative charge. When a battery is delivering its energy, the electrons are flowing from the negatively, electron rich side of the conducting material, toward the positively charged surface, that lacks electrons. They seek balance, that is the nature of electron interaction, to be surrounding a balanced conductive atom. To be conductive, suggests the electron cloud can easily accept and lose an electron. A string of these atoms allows electrons to easily jump from atom to atom in a steady flow, attempting to populate the moving electrons onto the material that lacks or is missing electrons at the end of the line; until an equilibrium is reached between the negative and positive sides.
The simplest example is the voltaic pile. It uses an acid and two plates, one zinc and one copper. The acid dissolves the zinc which gives off two electrons, the zinc becomes an ion, travels to the copper, and steals two more electrons and brings them back to the zinc. Basically a build up occurs of electrons on the zinc plate. These electrons can be dumped back over to the copper plate through a circuit.
Im not an expert, Im a tattoo artist, but thats the gist.
I like tatoos
@@ludicscience LOL :)
They're fun, a bit painful, but worth it if the design fits the body and is genuinely artistic.
I like circuits... just learned to design pcb's in Eagle, working on a new product line of S.T.E.M. toys and gadgets!
I enjoy your videos, I like to see the various ways components can function together to solve a problem.
what if it will automatically on? instead of automatically off
make it so that it turns off for a set time and put a buzzer on the output.
Your ad for JLCPCP shows zero shipping, this is not the case.
I´ll check that
Thanks
JLCPCB is a great price if your ordering a lot of boards. If your just needing a quick prototype in the U.S., OshPark is a 5 day turn around. 3 boards, 1"square, about $5 total, free shipping.
I did try to make this circuit using a 5v relay and 5v input power but the circuit was unstable. The relay would not energize. I don’t understand how the second transistor with no base resistor can act as a switch. The rush of unrestricted current from the positive supply into its base when the first transistor turns on should send it into orbit not saturation. One downside of this author is that he rarely responds to your questions!!
I wish you built this circuit exactly like the drawing. Too hard to tell where your leads are. The potentiometer wasn’t in the drawing at all. Fail.
Please explain in hindi.
You’re not going to show us how to set it up? Smh
Are you a native English speaker?
I am not, and I can easily say that this guy is not as well. Like wtf?