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Re: microcontroller picking up noise?
Phil,
Most consumer "UPS"s are, in fact, "SPS"s. Standby Power Supplies. So while there's still adequate power available from the mains, the SPS only filters it slightly before passing it along. A true UPS is always running its inverter from the DC supply that's charging the battery. FYI, anything that's going to really filter your power is going to run you around $100. That said, you're looking for a power conditioner or line conditioner. Be suspicious of anything that looks like a standard strip-plug.
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