Mods to a Jen SX1000

[Jezz]

I had my Jen SX1000 in work today to clean up the pots. Then I had a look
around with a scope and the circuit diagram and I noticed that the switch
for selecting noise (off/pink/white) has a unused pin when in the off
position that could be used to mix another signal in instead of noise.
There's a divider in the synth already built round a 4013. The output of the
first half feeds another divider but only on edges. This feeds some sort of
shaping circuit for the sawtooth. I was hoping to use it as a sub-oct but
the pulses are too small. So a quick look round produced a spare 4013 flip
flop as a divider circuit. Power taken from across the PW pot, input from
the first half of the existing 4013 and output to the noise switch off
position. Now the noise volume is a sub-oct level when no noise is selected.
And no destructive mods such as new holes.

jezz.

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   jezz at bluebear.freeserve.co.uk
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