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The theory behind the idea is sound...

But the problem is how the typical computer UPS works. The typical UPS box has some filtering and surge protection that is applied to your household AC current but the regeneration part of the equation is not kicked in until the AC voltage drops below a certain threshold.

The turntable boxes mentioned by another poster uses the same technology that a computer UPS uses when it kicks into regeneration mode but the turntable box runs like this full time. The computer UPS will not go into AC regeneration mode unless you lose AC power or it drops below a threshold.

The computer UPS concerns itself with providing clean power and uninterruptable power. It does so by charging its battery, filtering and passing along the AC power when that AC power is available and depending on its battery and AC regeneration circuitry to provide the AC power when the household power drops. Some computer UPSs do the filtering and surge suppression better than others but by design they allow less than perfect power through assuming that power is good enough to keep the average computer operational.

You are better off buying one of the turntable speed control boxes that are available. It will do the job you want full time.


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Life is analog...digital is just samples thereof

Edits: 05/29/12

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