Cgs synth

>As noise levels are not critical for his intended use, for power, I
>guess I could use a resistor divider with a 9V battery to, generate
>±4.5V, with the centre tap to GND on the PCB, and something like a 47uF
>cap between the centre tap and 0V on the battery (which is now -4.5V on
>the PCB)

You would need two capacitors, one across each leg of the voltage divider.
It would not be particularly kind of batteries though.

>I 'll need to attenuate the level after the effect, which will have
>quite a lot of gain, in order to approach unity gain. Question is,
>keeping a 1K output impedance, how could I alter values in the circuit
>to achieve this? I don't understand the circuit , and I guess I could
>always do the obvious, and use a voltage divider at the output using
>the 1K final output resistor as one half, and a pot or fixed resistor
>to GND as the other half of the voltage divider, but I suspect that
>might have a big effect on the output impedance - I don't know if
>that's a real problem or not. The output will directly drive a guitar
>combo input.

You will find that with a reduced input, the output of the filter will not
be that high either, so chances are you will not need any output divider at all.

Ken
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
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