Trust me it's the phones auto correct turning opamp into obama :)
I think I had the timebase measurements AC coupled and there was no change
in level. I haven't checked the DC. I will do that tomorrow when I'm back
at the workshop.
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On Wed, 17 Mar 2021, 18:17 Ozan, <ozan_g@...> wrote:
I have cleaned thoroughly the entire area with IPA and now I have steady
-2950. This also resolved the problems at the Obama where now I have
Please no politics in the group :)
basically zeroes at pins 2 and 3 and 0.6V at pin 6, the grid bias seating
is changing the U1665 but has no visible impact on the trace.
It looks like your HV supply is in good shape now.
The Z out DC is now 16 to 165V when I regulate this but there is no
impact
on the trace
With these new measurements observations are pointing to faulty diodes.
Regarding the timing
I can see triangle wave and pulse on respective outputs and they change
shape /frequency as I change the timing basically making them narrower
but
this trend stops and they don't change shape in last few settings but
remain exactly the same.
Flat at what voltage level? Compared to good waveforms are these waveforms
at the max/min of the good waveforms are at a different DC voltage?
Ozan
