Hi, thanks for the reply,
yup, i used the 2n2222 & 2n2907; any chance i fried them when i
reversed the power supply?
I'll check it like you suggested with a higher res pot.
When this "works" (other res pot); it means i have too much gain in
the output stage, yeah? which component can be held responsible for
this? or am i jumping ahead too fast now?
thanks, marcel
yup, i used the 2n2222 & 2n2907; any chance i fried them when i
reversed the power supply?
I'll check it like you suggested with a higher res pot.
When this "works" (other res pot); it means i have too much gain in
the output stage, yeah? which component can be held responsible for
this? or am i jumping ahead too fast now?
thanks, marcel
--- In cgs_synth@yahoogroups.com, sasami@h... wrote:
> Were the specified transistors used? It sounds like you have too
much gain
> in the output stage. Try replacing the 1k pot with something
higher and see
> if it makes a difference.
>
> Ken
>
> >hi, i've recently built the steiner vcf; but it hasn't been
working
> >properly. when i first tested it i connected the power backwards,
and
> >now when i use it it constantly oscillates even with resonance
turned
> >completely down. the sound is like a standard feedbacked signal,
loud,
> >and high-pitched. when i turn the cutoff i can heare some
filtering
> >through the screaming feedback though.
> >The tl071 is still fine, and i've checked+reflowed the solder
joints;
> >my question is, any of you smart people know where the problem
most
> >likely would be/ where i should start troubleshooting?
> >should i replace (test?) transistors, caps?
> >
> >any help is welcome
> >
> >cheers, marcel
>
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