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Invoke: Tyop and any other electronic experts... by mekkanik_mike 2008-01-17 02:39:22
Take a look at this thingy.

I agree it's a pretty basic circuit, but I do have one question. I intend to use this circuit to power 4 sets of LEDs that operate in pairs (think turn flashers). I have the circuit largely figured out to use only once pair of ICs. The final setup will consist of five boards, one driver and four holding the LEDs. However, I do have the following questions;

  • My supply is 12v DC. Can I simply use a 5V power FET to drop the voltage to 5V, and still get it to work? Are there any pitfalls in using a power FET?
  • What are the precautions to be taken of one set of leads from the 4017 turn out to be approximately 3-4 feet long? Would dropping the voltage to 5V have an adverse effect?
  • Would it be best to have a 4017 mounted on each display unit and let the driver unit carry only the 555?

[ Reply ]
  IMHO a 7805 would be a better option for +5v by karl-henrik2008-01-17 02:51:05
    datasheets by karl-henrik2008-01-17 03:19:20
  I'll have to get back to you. by Tyop2008-01-17 02:52:42
  Don't use the FET! by ideur2008-01-17 02:59:50
    That wouldn't work. by AndyA2008-01-17 08:29:26
  My point(s) of view: by EnzoMatrix2008-01-17 03:07:45
    3-4 feet = 1m by AndyA2008-01-17 09:04:29
  <Deleted><Deleted>2008-01-17 03:46:28
    Gaaaaa!!! Mods!! by mekkanik_mike2008-01-17 03:17:36
      How did you manage to do that? (n/t) by hax80r2008-01-17 03:46:39
        No clue... by mekkanik_mike2008-01-17 03:48:11
    Mod'd: M-M-M-M-Multipost. (n/t) by Tyop2008-01-17 03:47:09
  <Deleted><Deleted>2008-01-17 03:44:57
  <Deleted><Deleted>2008-01-17 03:45:19
  <Deleted><Deleted>2008-01-17 03:45:30
  <Deleted><Deleted>2008-01-17 04:53:44
  Thanks for all the advice guys... by mekkanik_mike2008-01-17 03:46:17
    the most expencive 4017n i found was 1 USD by karl-henrik2008-01-17 03:20:55

 

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