Sunday, August 19, 2018
RH Electronics 5 Voice analog synthesizer - Major update
Published on Aug 18, 2018 RH Electronics
"It works! Well one voice does on breadboard.
Up and running are 2 oscillators (CEM3340 based, but using AS3340)
These go to a 4066 switch then the waveforms are mixed, so you can switch on all of them on both oscillators.
The oscillator is based on the Prophet 5 circuit, the voice chip is a CEM3372, which was £35 but worth it, as it has everything, 2 inputs voltage controlled mixer, a low pass filter with cutoff/resonance and a VCA
Then an envelope generator to control the filter and amp (test just the amp)
So one full voice will need
2x oscillators
1x Signal processor
2x Envelope generators
1x CV mixer for the envelope and cutoff (filter only) and LFO CV
Microcontroller will feed SPI DACs that will be the voice and control CVs, but then all the voice circuits are analog."
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