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Re: HP200CD oscillator


 

Thanks Jim. I have made plenty of typos don¡¯t worry, I said 132V below but meant -132V.

I replaced C12 to no effect, it measure fine can you believe it.

The last thing I decided to check tonight was the AC voltage from my variac transformer because I am seeing low voltages all through the circuit. Guess what, my variac is way off at 115Vac, it measures about 85Vac. I have never had to check it as it is spot on at 240Vac which is fine for Australia. I am starting to look like a real amateur, not something I even considered checking. Anyway, the voltage at R30/31/40 is now -172Vac. I will check the other voltages as per recommendations below. The device is working really well, lovely clean sine wave across the spectrum. It¡¯s just R30 that has me worried. Perhaps I will replace it to see if that helps.?

Cheers

Richard

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