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Group Buy for Jan's high voltage regulator
Group Buy for Jan's high voltage regulator
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Old 17th September 2020, 12:00 AM   #251
Deke609 is offline Deke609  Canada
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Location: Toronto
Group Buy for Jan's high voltage regulator
No luck with the tests. All of the following failed: (1) parafeed load (amp as designed) with 50K resistor across T-reg output; (2) same as (1) but with addition of 110 uF cap in parallel with 50K resistor; (3) same as (2) but with output transformers disconnected. In all cases, the T-reg output was unstable - randomly bouncing around +/- 1V rms or so.

I will look into the motorboating issue. I think I will need to scope the amp to explore this. Without the reg, with the output stage fed directly from the CLCLC filter, I don't hear any motorboating, or hum/noise of any kind. But I suppose there could be inaudible oscillation. I need to read up more about this and do some scoping. This will have to wait a week or more -- but I will report back on what I find.

cheers and thanks, Derek
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