Practical circuit help...

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Article #14935

#14935

From: H. C. Bowman
Date: Tue, 22 Dec 1992 14:43

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Hullo--

A practical circuit question: I've got a circuit that looks vaguely like
the following, and I wonder whether I need some additional decoupling on the
power supply line.  




  ------                              -----------                     --------
 |      |      14 Feet 20 ga         | TTL Logic |   6 Feet Ribbon   | 40 KHz |
 | 7805 |----------------------------|  Control  |-------------------| 400 mA |
 |      |                            |  Circuit  |                   | 10% on |
  ------                              -----------                      -------

My TTL components have .001 uF filter caps for high-frequencies, and
every-other one has a .1 uF cap for decoupling.  What I'm wondering is whether 
I need to compensate for the 400 mA current pulses, and if so, how?  If I hang
a gi-hugeous electrolytic on my TTL board, what do I do about current inrush?

I've not yet built this thing, so I don't have anything empirical to go by.
Manufacturing concerns dictate that any decoupling be done on the TTL board.

Many thanks!

--Cliff

-- 
| Cliff Bowman     |(501) 968-2232 Voice | As of 1 December, 1992, I was |
| Electronics Wonk |(501) 964-6118 Pager | approximately $1,017,077 shy  |
| Innovation Ind.  |(501) 968-7986 Fax   | of being a millionare.        |

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Message-ID: <1992Dec22.144348.3388@netcom.com>

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Newsgroups: sci.electronics
Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!umn.edu!csus.edu!netcom.com!hcb
From: hcb@netcom.com (H. C. Bowman)
Subject: Practical circuit help...
Message-ID: <1992Dec22.144348.3388@netcom.com>
Keywords: decoupling
Organization: Box of Rain Productions
Date: Tue, 22 Dec 1992 14:43:48 GMT
Lines: 32