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A-111-3 is a high end VCO with a 4HP panel
The Doepfer A-111-3 is an extremely space-saving precision VCO/LFO with a 4HP panel only. Essentially it's the same basic circuit as the A-111-2 but with reduced features:
Exponential frequency section:
Pulsewidth section for rectangle output:
Waveform outputs:
Modifications version (prototype 2):