[sdiy] 9V battery vs. 9V psu power

[harrybissell]

Best bet is to connect the base of the noise transistor to
-9V.  That would allow up to 18V across the transistor, minus diode
drops.

If you get (teehee) NOISE pickup from the -9V you could duplicate the
4.7K / 100uF filter on the base as well. Might need to play with the
bias resistor.

Note that PAiA used to run the noise generator from the 18V supply...
not
the 9V. True of the 'surf synth' as well

H^) harry

Scott Gravenhorst wrote:
> 
> Prolly a silly question, but just in case, I assume you are
> connecting ground to where the two 9 volt batteries are
> connected together?  Seems to me that this should work, esp.
> if it works with a PSU of the same voltage.
> 
> Karl Ekdahl <elektrodwarf at yahoo.se> wrote:
> >I have a noise source that refuses to work from a dual
> >9V battery split supply, but that works perfectly with
> >a +-9V psu. I can't for my life figure out what to do
> >to make it work, the only difference i can see is that
> >the batteries will drop in voltage a little after
> >usage. I used this shemo by René Schmitz:
> >(http://www.uni-bonn.de/~uzs159/noise.png)
> >
> >thanks
> >
> >Karl
> >
> 
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