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Here's my version




Hi Dave. I was waiting for a post from you before I jumped in.

I also built one in conjunction with Dave's construction (we commisserated on several things along the way). I would say that it is not a kit for a beginner, and some knowledge of what you are doing besides being ablt to handle a soldering iron would be beneficial. In my implementation I am not using a 12V DC battery, but rather an AC to DV 12V laptop power supply. My costs came in at about $400, about half of a used SDS, but the time it took to build was not insignificant.

I agree with Dave's assessment of the level of improvement. Fundamentally I noticed that the image and soundstage are very stable now (they were pretty good before, but this is rock solid now). The 10W VPI motor that I have, in its housing, didn't seem to vibrate very much. However, when removed from the housing and held in the hand you can feel the vibrations clearly. This is due to phase problems with the AC coming in.

Mark's controller, aside from maintaining a stable frequency for speed control, does a wonderful job of synchronizing and stabilizing the 2 phases of AC power to the motor thereby making it very quiet. There is a truly noticeable improvement of how quiet the motor rund when in the hand, and a quiet motor will not transmit vibrations through the belt to the platter.

Enjoy,
Bob


A gentleman is best defined as someone who knows how to play the accordion ... and doesn't.

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