[sdiy] What's wrong with this picture?

[Hallvard Tangeraas]

At 23:34 +0200 22-06-02, René Schmitz wrote:

>The circuit needs to be run from a bipolar supply. You tied ground and -15V
>together.
>This won't work.

Bipolar power supply? You mean like +15V, -15V and 0V?
I tried running it off a 9V battery (thinking this should work since the
operating range of the TL-082 is 4-15V and the LM-741 is 5-18V).


>(Pin 5 and 4 are tied tothether on IC 1, break up that
>connection,

OK. No problem.

>and
>use the trace in the middle where the R2, R6, and the diodes meet as your
>GND.)

In other words:
After separating pins 4 and 5 of IC-1 (TL-082), should I connect pin 4 of
the same IC to -15V and leave the rest as it is (connected to the "-" power
supply pin, but instead feeding 0V/GND to it?).

What about IC-2 (LM-741)? Should I remove pin 4 from the GND tracks on the
PCB as well, and instead connect it to -15V?

Is there any way I can use the circuit with a battery (i.e. a 9V battery as
mentioned above)? Alternatively I can use the vocoder's power supply as it
has +12, -12 and 0V lines.

Thanks for looking into it!


Hallvard
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