Comments on: Simple 2 LEDs flasher

By: park

park — Fri, 26 Aug 2011 04:05:37 +0000

Thanks…tried many 2LEDs flasher circuits for my train crossing -signal light. Only this one work ( I’m new to elec. ) and your formula for flash timing & link to study more -very useful to me thanks again.

By: hasan

hasan — Thu, 14 Apr 2011 06:56:21 +0000

v good can u pest bakward photo?

By: Jimmy

Jimmy — Sat, 02 May 2009 14:19:24 +0000

Dear sir…
can this flasher flash more than 2 LEDs?
How to do?

By: Trimbitas Sorin

Trimbitas Sorin — Mon, 19 Mar 2007 17:20:03 +0000

To find the answer to your question just read the comments above yours
Hope this helps
Sorin

By: warren

warren — Fri, 02 Mar 2007 04:43:23 +0000

what are other applications of this circuit?

By: warren

warren — Fri, 02 Mar 2007 04:41:32 +0000

what is the use of the two trasnsistors in the circuit? what makes it blink?

By: Raed

Raed — Thu, 25 Jan 2007 12:28:19 +0000

no problem ,..anyway thans for ur interest…

By: Trimbitas Sorin

Trimbitas Sorin — Thu, 25 Jan 2007 07:56:02 +0000

Hi,
I’m glad that you are so curious
I’m not to deep into electronics (it is just a hobby for me, I work as a programmer in the real life).
I searched a little for you and here is what I found about the role of the capacitors in this circuit : http://www.play-hookey.com/digital/experiments/rtl_astable.html
HTH
Sorin

By: Raed

Raed — Wed, 24 Jan 2007 21:56:40 +0000

thanks.but i dont understan how the capacitors work in this circuit…?
which side of the polarized capacitors charge and discharge (positive or negative)??

By: Trimbitas Sorin

Trimbitas Sorin — Wed, 24 Jan 2007 12:52:11 +0000

Hi Raed,
This is just a a classic 2 transistor astable multivibrator.
An article about it : http://en.wikipedia.org/wiki/Multivibrator

By: Raed

Raed — Wed, 24 Jan 2007 10:44:47 +0000

dear sir..
what is the function theory of the design…?
how each capacitor effects the opposite transistor ? and why have you used polarized capacitors??