Cgs synth

bet you are glad you used a socket.
With no chip in the LM358 socket, check the voltage on pin 6 of the
socket and adjust the trimmer, does the voltage change? If so, at
least your CV input should be okay.

With the chip, if it gets hot, suspect a short somewhere or possibly
a resistor is incorrect.

Maybe it is worth mentioning, have you got the tube pins wired in
the right order? it can be confusing (I say this from experience :-
)) if you are new to tubes.

--- In cgs_synth@yahoogroups.com, "prophei" <prophei@...> wrote:
>
> --- In cgs_synth@yahoogroups.com, "bbluthang" <jumpswine@> wrote:
> >
> > Have you tried to set it up as per Ken`s instructions?
> >
> > SetInitial Gain pot to 0, no CV in, feed in an audio signal and
> > adjust the trimmer until you cannot hear anything on the output.
> >
> > Once you have done this, plug in a CV signal and adjust initial
Gain
> > to get it VCAing as you like.
> >
> > If you have tried all this, and still no effect. What voltage
are
> > you getting on pin 1 and does it change when you adjust the
initial
> > Gain pot? (It should!)
> > cheers
> > Andrew
>
> i just went to test pin 1 of the lm358, and found nothing there.
then i somehow blew the
> ferrite bead (i had a resistor here) located next to the cv inputs
to the board. i have no idea
> how i did this, and want to think it was pure coincidence (tho
this may be a rather unlikely
> thing). all i have ever been able to measure around this ic has
been positive and negative
> power (on pins 8 and 4 respectively).
>
> i replaced the blown bead (resistor) mentioned above and then
swapped the lm358 for a
> 5532 i had sitting here to see what would happen. this chip gave
me actual readings on
> the pins. pin one was registering a 12.5. i still was unable to
get anything to work
> properly, and noticed that the 5532 seemed rather warm, so i
pulled it and quit for now.
>
> i sit here scratching my head yet again.
>