alternating LED flasher using 12Vdc supply and 555 timer

tr1 · Mar 25, 2013

could some one direct me to a ckt. diagram please? I would like to assemble an alternating
LED flashing ckt. for use on a model railroad, your help is grately appreciated, thankyou,tr1.

CocaCola · Mar 25, 2013

Google "two transistor flasher" skip the 555 it's overkill..

tr1 · Mar 26, 2013

thankyou,cocacola,tr1

CDRIVE · Mar 26, 2013

We have one here.

https://www.electronicspoint.com/3v-2-led-flash-circuit-t247808.html#post1465558

Chris

tr1 · Mar 27, 2013

CDRIVE ,THANX, for your instructions, tr1

CDRIVE · Mar 27, 2013

Your welcome. Here's an updated version for 12V operation. The LEDs should flash at about 1 Hertz. Each LED is on for 1 second while the other is off. Please note that it's important to observe the polarity of the caps as shown.

Personally, I'd use a 555 because it would only need one timing cap and fewer components.

Chris

Dispatch32 · May 26, 2022

What would you need to adjust if you wanted to use Three instead of One 12 Volt Yellow LED's as Alternating Flashing Lights?

Could you please draw up a diagram for 12-14 Volt DC Input a using a 555 Timer IC and Three 12 Volt Yellow LED's on each half of the alternating Flasher circuit?

danadak · May 26, 2022

https://www.instructables.com/simple-alternate-LED-flashing-using-555-timer/

https://mechatrofice.com/circuits/555/led-flasher-circuit

Regards, Dana.

Dispatch32 · May 26, 2022

Thank you very much! I think the one using 12 volt input, 2 555 timers and 2 transistors, plus resistors and capacitors should work for my 12 volt LED's I plan to use on my vehicle for 2 sets of 3 Alternating Yellow Warning Lights. I just need to get a few items and start putting together a test circuit.

danadak · May 27, 2022

Protect the circuit from load dump -

https://m.littelfuse.com/~/media/el...n_automotive_environment_application_note.pdf

Also consider using a dual 555 timer -

https://www.ti.com/lit/ds/symlink/ne556.pdf?ts=1653639239224&ref_url=https%3A%2F%2Fwww.google.com%2F

Regards, Dana.

hevans1944 · May 29, 2022

Dispatch32 said:
What would you need to adjust if you wanted to use Three instead of One 12 Volt Yellow LED's as Alternating Flashing Lights?

Could you please draw up a diagram for 12-14 Volt DC Input a using a 555 Timer IC and Three 12 Volt Yellow LED's on each half of the alternating Flasher circuit?

SEE MY RESPONSE TO DANA, BELOW.

danadak said:
Protect the circuit from load dump -

https://m.littelfuse.com/~/media/el...n_automotive_environment_application_note.pdf

Also consider using a dual 555 timer -

https://www.ti.com/lit/ds/symlink/ne556.pdf?ts=1653639239224&ref_url=https%3A%2F%2Fwww.google.com%2F

Regards, Dana.

The two of you please note the date of the last posting to this thread: CDRIVE, Mar 26, 2013, post #6.

This thread is DEAD and it is quite likely that CDRIVE is too. The last time I tried to talk to him, his wife said he had suffered a stroke. I got the distinct impression that his wife was having a hard time coping with it, so I decided not to try to intrude on them any further. Back in the day, CDRIVE was a prolific contributor to this forum. I miss him a lot. Perhaps a moderator, or the owners of this website, could "look him up" and find out if he regained his health or, like @KrisBlueNZ, sadly passed away...

Hop -- AC8NS

Martaine2005 · May 30, 2022

Poor uncle Chris (CDRIVE), I miss him too.

Martin

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Uptowise · Thursday at 8:19 AM

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alternating LED flasher using 12Vdc supply and 555 timer

alternating LED flasher using 12Vdc supply and 555 timer

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Hauling 10' pipe on a Trek Shift3

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