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From: heck@babcock.cerc.wvu.wvnet.edu (Michael Adam Heck)
Newsgroups: sci.electronics
Subject: Re: IR Reception - Modulation and Quality
Message-ID: <1542@babcock.cerc.wvu.wvnet.edu>
Date: 4 Apr 91 18:23:48 GMT
References: <160142@felix.UUCP>
Sender: news@cerc.wvu.wvnet.edu
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	Just thought I'd offer another solution...instead of trying to filter
the supply to the whole circuit, why not just filter the supply to the module.
This requires a smaller capacitance for the same level of filtering.
I don't know offhand how much current the module pulls but I'm sure it
is probably small compared to the rest of your circuit.  Maybe try this...


		+5v
		|
		R
		|
	      	_________________________
		|                       |+
	     _________                 ---
	     |module |                 ___
	     |	     |                  |
	     _________                 gnd
		|
		|
	       gnd


 As long as R is small enough to avoid any apreciable voltage drops
due to the steady-state current of the module, the module should still
function properly.  C will supply any instantaneous current needs of the
module as well as filter the noise from the 5 volt supply.  I've seen
this used in the low-level stages of high-gain amplifier modules to
filter noise from the more sensitive stages of the circuit.

	Anyway, just a thought I had.  Hope it can help.


Mike