Description
Module 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.
Features:
- Triangle core
- Min. 15 octaves pitch range (typ. 0.5Hz – 20kHz with appropriate external CV)
- Perfect 1V/octave tracking over min. 10 octaves (typ. 20Hz – 20kHz)
- Exponential frequency section:
- Tune control (~ 0.5 or ~ 2 or ~ 10 octaves range, selectable via internal jumper)
- 1V/octave CV input
- XM input with attenuator
- The XM input socket is normalled to a small positive voltage so that the XM control works as fine tune control when exponential FM is not in use (thank’s to Václav of Bastl Instruments for this tip at Superbooth in Berlin)
- Access to bus CV (via jumper, optional)
- Linear frequency section: LM input (without attenuator), DC coupled
- Pulsewidth section for rectangle output: PW (manual pulsewidth control from 0%/output = fixed at “low” state up to 100% / output fixed at “high” state)
- PWM input (without attenuator), about 5Vpp for full PW range
- Sync input (selectable hard or soft sync via internal jumper)
Waveform outputs:
- Sawtooth, output level ~ 8Vpp
- Rectangle (controlled from pulsewidth section), output level ~ 8Vpp
- Triangle, output level ~ 8Vpp
Nearly “perfect” waveforms (no glitches)
Modifications version (prototype 2):
- Range switch so that the module can be used as VCO or LFO (in LFO mode all frequencies about 1/100 compared to VCO mode)
- LED (for display in LFO mode)
- Smaller distance between the knobs and smaller knobs (because of the required space for the additional range switch)
Specs:
40 mA +12V
40 mA -12V
0 mA 5V
4hp
65 mm deep
