Cgs synth

Thanks Ken.

I have a spare CGS30 board already built, and I'm putting it in a
temporary housing ready for tomorrow's rehearsal/tryout. I'll add the
second capacitor, and probably a 2.1mm DC input jack as well if it'll
drink juice - my mate has a DC supply in his pedal board. I borrowed
the Cap value figure from the diystompboxes FAQ. seems a little high to
me, but i'm not a guitar guy really....

cheers,
Dave

On Nov 13, 2010, at 21:23, sasami@... wrote:

>
> >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/>
> Australian Miniature Horses & Ponies
> <http://www.blaze.net.au/~sasami/>
>
>
>