These are my build notes for the Bi-Di chopper.
This is a dual stripped down version of the original Chopper.
Chopper/Bi-Directional switch - Build notes
It is a very easy build with few components.
It's a analog switch, with a difference.
The signals being switched also control the switching,
so things happen that you might not expect.
It can be used to process CV and audio signals.
The basic idea for the Chopper is from a 1975 paper titled – ‘A nonlinear modulator using delta principles’
by S.K. Mullick and K.R Srivathsan, although this version drops the comparator output, makes the slew stage adjustable, converts
the 2 inputs so they can also be outputs and adds an in/out stage before the slew section.
Links
+ Wiki
+ BOM
Andrew's got some similar modules:
+ Chopper
+ Chopper Bi-di (silver Panel).
NLC words of wisdom
Resistors & caps first
RL Leds - using 4.7K
DG213 - on order from mouser
to be continued ...
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You can find more NLC builds here.
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