Garey Barrell <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Hubert -
I find it hard to believe that a cap is breaking down at 10V and not at
8V.........
What FET are you using? ALL FETs have a range of current (Idss), and
the MPF102 has a wider range than most. Perhaps a different FET?
Does the amplitude of the output change with the frequency change, or
frequency only?
Interesting problem......
73, Garey - K4OAH
Glen Allen, VA
Hubert ROTH wrote:
"Hubert ROTH" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Hi Garey
Thanks for the answer.
I checked that. Problem subsists even with a lab supply in place of
the 11V Stability turns to normal at 8V but than I have not enough
output to feed the mixer.
With a spectrum analyzer and a 10hz BW you see the signal playing rock
an roll until 8V
Changing fet and buffer transistor did not hel
BTW when I opened the can I noticed that the FETs Source lead was not
soldered was loose I told myself thats it !!
Hooked te supply and it was still there
I separated the PTO board from the slug oscillator runs than at
5330Khz just to make sure that its nothing mechanical but no!!
Could be a ceramic cap that I did not change as I dont know the value
and as I dont want to ruin temp comp. With the high Q voltage could be
high enough to render them unstable
All ideas are wellcome
73,s from Hubert F6DUK
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