AVR-Chat

At 12:47 PM 5/24/05 +1000, Claxton, Dean J wrote:
>Interesting - yes there is a good chance that is causing it. I didn't
>even think of that. I'll try a bigger supply and see if that fixes it :)
>
>I usually test it with a PC PSU, but was using a 12V plug pack last
>night - I think it is rated at 1A, so if the hobby motors pull more than
>that they that will most likely be the problem. The PC supply should be
>fine, so I'll try it with that.

Consider adding a diode and holdup cap to your logic supply.  If your cap 
is large enough it'll help you ride through momentary drops from motor 
acceleration.  A monitor circuit to guard against sustained drops from 
stalls would not be a bad idea if that turns out to be sufficient.  Also if 
you are drawing that much more with the motors as opposed to the fans keep 
an eye on your FET temperature.

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,   be 
they legal, genetic, or physical.  If you don't believe me, try to chew a 
radio signal. "  -- Kelvin Throop, III
http://www.aeolusdevelopment.com/