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.
PCB = USD15
panel = USD20
assembled = USD160