RE: [AVR-Chat] Fan Controller
2005-05-24 by Claxton, Dean J
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. I've got a diode (reverse polarity) across the load - was hoping that would have sorted out the transients and back EMF. Thanks for that guys :)
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-----Original Message----- From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Bruce Parham Sent: Tuesday, 24 May 2005 11:57 AM To: AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] Fan Controller You may need a stiffer power supply. Fans typ pull 100-200 ma, a stalled hobby motor can be a lot more, easily 1-2 Amps. Peter Gargano wrote: > Switching transients and back EMF noise. > > Claxton, Dean J wrote: > >>It would give a short burst, then reset (motor would run for a little >>bit - maybe a quarter of a second). >> >>Does anyone have any idea what could be causing it? As I said it works >>fine with the fans. Output is via logic level MOSFET's. > Yahoo! Groups Links