Doepfer A-111-2V

Module A-111-2 is the successor of the obsolete High End VCO I A-111-1.

Here are the most important features of the module:

• triangle core (i.e. all other waveforms are derived from the triangle by waveshapers)
• fully analog design
• min. 15 octaves pitch range (typ. 0.5Hz – 20kHz in VCO mode / 0.001Hz – 40Hz in LFO mode)
• perfect 1V/octave tracking over min. 10 octaves, typ. 20Hz – 20kHz (control LF has to be fully CW for perfect 1V/octave tracking)
• exponential frequency controls and inputs
• linear frequency controls and inputs
• Pulsewidth controls and inputs (for rectangle output)
• Hard Sync input (CEM3340 hard sync type)
• Soft Sync input
• Waveform outputs
• Range switch to select VCO/VCLFO mode, frequency relation between VCO mode and LFO mode about 500 : 1
• dual color LED display (to display low frequencies below ~ 25 Hz)
• Nearly “perfect” waveforms
• high end triangle to sine converter with excellent sine waveshape (thank’s to Tim Stinchcombe who recommended this circuit)
• the micro precision VCO A-111-3 uses the same VCO core as the A-111-2, but has less inputs, outputs and controls