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On Thu, 2007-07-05 at 13:26 -0400, Colin McGregor wrote:
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<FONT COLOR="#000000">> > So, why not use a battery?</FONT>
<FONT COLOR="#000000">> </FONT>
<FONT COLOR="#000000">> </FONT>
<FONT COLOR="#000000">> .... or an array of smaller capacitors in parallel,</FONT>
<FONT COLOR="#000000">> until you find the</FONT>
<FONT COLOR="#000000">> right size. This way you can test the design out</FONT>
<FONT COLOR="#000000">> and tweak it before</FONT>
<FONT COLOR="#000000">> committing to an expensive part. It's also the kind</FONT>
<FONT COLOR="#000000">> of thing you can do</FONT>
<FONT COLOR="#000000">> right now. </FONT>
<FONT COLOR="#000000">Attempting to find capacitors anywhere close to 0.33 F</FONT>
<FONT COLOR="#000000">is an issue, It isn't like I could painlessly find say</FONT>
<FONT COLOR="#000000">two 0.16 F capacitors and run them in parallel :-( . </FONT>
<FONT COLOR="#000000">Digi-Key looks like the route I will have to follow</FONT>
<FONT COLOR="#000000">:-( .</FONT>
<FONT COLOR="#000000">> Batteries would definitely be simpler, though I</FONT>
<FONT COLOR="#000000">> understand not wanting</FONT>
<FONT COLOR="#000000">> to keep replacing them.</FONT>
<FONT COLOR="#000000">Exactly, avoid batteries if at all possible is my view</FONT>
<FONT COLOR="#000000">in all of this :-) .</FONT>
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Actually, I think there's a way to avoid batteries and capacitors. There's already a whole whack of rails already built into your PC, so use them! Pull a line of off the power supply on either a spare drive connector and use the 5V rail from there. It won't be pretty, but it'll work a ton better than a huge cap.<BR>
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-kms<BR>
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