Vitaliy wrote:
> Dave Tweed wrote:
> > My guess would be that the air conditioner controls the compressor with
> > a triac, and this is producing some high-frequency harmonics on the
> > power line. The compressor motor itself should be an induction motor,
> > and not producing harmonic distortion. A brute force low-pass filter on
> > the AC line, or maybe a ferroresonant transformer, would help confirm
> > this.
> 
> You mean, like a 0.1uF cap across the 110V lines? Maybe with a choke in 
> series with the load?

I was thinking of something involving chokes and capacitors (pi network?),
with a fairly steep cutoff above 60 Hz in both common and differential
modes.

> How about an off-the-shelf line conditioner,

Depends on what's inside. Just a handfull of MOVs for surge suppression
won't have any effect.

> ... or an online UPS? 

Only if it's pure sinewave output, otherwise it'll just confuse the
issue. Something like the Galaxy Audio "Far Outlet" would be ideal, but
unfortunately, it's been discontinued and is only available used.

-- Dave Tweed
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