Thread: microcontroller picking up noise?
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Unread 15-09-2007, 18:58
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Re: microcontroller picking up noise?
Quote:
Originally Posted by sciguy125 View Post
I'm guessing that it won't because the UPS I have on my computer doesn't filter out the noise. But can someone point me to a device that would?
Just a little factoid: none but the really *really* expensive UPSs actually do line filtering. The UPS on your computer probably doesn't filter the line at all, but will look filtered when disconnected from mains power supply. It might be a true sine wave, but I think that they generally use a stepped wave that bears similarity to a sine wave (that's the way most inverters work; and that is all a UPS is--a battery with an inverter and a charger in one box).

So it's not surprising that the UPS isn't filtering the noise. I'd be curious to know if the disconnected UPS (beeping away) would fix the problem with your circuit.

Good luck,
JBot
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Last edited by JBotAlan : 15-09-2007 at 19:00. Reason: said the opposite of what I meant to say...