How to make a simple led traffic light circuit

[@OnboardingInformation]

Very cool project, loved the traffic lights

[@HandHjoinery5546]

Thanks

[@diegoalanis6283]

Could you explain how the circuit works? as in why the leds pulsate

[@HandHjoinery5546]

There are many videos on YT about these circuits.

[@Tch.SouravExperiment]

“I really enjoyed watching your video! It’s motivated me to create my own content in a similar style. Thank you for being such an inspiring creator!”

[@HandHjoinery5546]

Thank you and have fun making your own content.

[@Blacksheepishot]

LEDs need to be revised and bigger caps via 2000 uf 16 vdc slow it down nicely

[@HandHjoinery5546]

That's right, I didn't want to slow it down too much, the video would have got longer.

[@HannahSpring]

Hi, i am trying to nut out on how to have 2 sets of 4 green led lights work of a USB, can you please guide me as to how, and the correct resister needed please, and will i need a resister between each led?

[@HandHjoinery5546]

Hi, if you just want to light up these 2 banks of leds, then run them in parallel with a 100 ohm resistor on one end of the power source.

[@HannahSpring]

@@HandHjoinery5546 Thanks for your speedy reply, i will check that out tomorrow

[@ShivaniDuta]

Which transistor did you use

[@HandHjoinery5546]

It's 2N3904 transistor, but you can use any NPN transistor, like BC547 or BC548.

[@chelsiramadhani4584]

I wonder why does mine lights up all at the same time? what is the solution for this problem?

[@HandHjoinery5546]

Double check the capacitors are connected the right way.

[@projaxix]

Can I add more to the board like 10 total LED's or it is just limited to 3 LED's total?

[@HandHjoinery5546]

You can add more LEDs, connect them in parallel for each colour.

[@projaxix]

@@HandHjoinery5546 But for the added LED, do I have to add another capacitor and transistor? Cus my adviser uses your model as our guide but he wants a total of 10 LED and for each LED there should be one capacitor and transistor...

[@nadaa-0]

Hi, if the power source uses a 9 volt battery, will it work?

[@chelsiramadhani4584]

kiw

[@HandHjoinery5546]

It will work.

[@ark_mcmlix4181]

very cool thx

[@HandHjoinery5546]

Thanks

[@diegoalanis6283]

only the yellow one pulsated 😢

[@HandHjoinery5546]

If you disconnect all the capacitors and check all the LEDs light up without the capacitors, then install the capacitors, check the polarity when reinstalling them.

[@reyialexandergarcesmelenci2811]

I need 30 second green, 6 second yellow and 30 second red, can I do with the same circuit ?

[@HandHjoinery5546]

Yes you can, just change the 3 capacitors to different values to get your desired time output.

[@reyialexandergarcesmelenci2811]

Thanks u

[@reyialexandergarcesmelenci2811]

@@HandHjoinery5546 can I change resisitors value?, my problem is the value of my capacitors are really big.

[@JyoshnaVemula-p6c]

We dont have 16 kilo ohm resistor how to perform project

[@JyoshnaVemula-p6c]

We can change the 16kilo ohm resistor

[@HandHjoinery5546]

Use a 10k resistor.

[@JyoshnaVemula-p6c]

Thanks

[@abidalibalouchofficial1415]

​@@HandHjoinery5546may we use 15k ohm resistor instead of 16k

[@HandHjoinery5546]

You can.

[@mehmetadiguzel3641]

Is that a flip flop circuit?

[@HandHjoinery5546]

It works in a similar way.

[@HandHjoinery5546]

It works in similar way.

[@guidobarrionuevo7224]

Hola .Cuando termina el verde .No vuelve al amarillo

[@HandHjoinery5546]

Hello, sorry are you saying its not working, can you write in English?