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Re: AID: RE: Re: News from AID Development

From: Christian Klippel   ckmamalala.de
Date: Wed, 26 Jan 2005 06:29:38 -0800

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hi all,

Am Dienstag 25 Januar 2005 21:30 schrieb robc@citytv.com:
> : Sent via the Art Interface Device mailing list: aid@interaccess.org
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>
> I played around a bit, (after re-reading the previous post, and realizing
> that you had done this already) and made up a test with 8 270 ohm
> resistors, and found that yes, the regulator does get uncomfortably hot. I
> made a small heatsink from a chunk of aluminum, and bolted it on, this
[...snip...]

what is the circuitry around the regulator ? do you have propper capicators at 
its in- and output ? if not, the regulator may swing at a high frequency, and 
thats what heats it up possibly......

at the input, use a 100µF electrolytic cap _plus_ a small plastic cap of a few 
hundered nF, put that small cap _close_ to the input legs.
on the output side again a small cap close to the pins, plus something around 
10 - 47 µF electrolytic.

im always this configuration in my circuits and so far never had any problem 
with the regulator getting hot, even without heatsink, at a few 100 mA ...

hope that helps, greets,

chris





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