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Key Features
The Doepfer A-111-3v Micro Precision VCO Vintage Edition is a compact VCO with the capability of being an LFO too. The A-111-3 uses a triangle core to get the different waveforms and has a fully analog design for a distinctive tone. This module features exponential and linear frequency modulation for extra tone shaping as well as pulse width modulation for the rectangular waveform. This features the same basic circuits as the Doepfer A-111-2 with reduced features in order to fit this into a small 4HP worth of space.
The module outputs a triangle wave, a sawtooth wave and a rectangle wave (the pulse width is modulated with PM). This module can take control voltages to modulate the XM, LM and PM. It also takes 1V/Oct for sequencing or playing with a keyboard. The waveforms can also be synchronised with the SY input and a hard of soft sync can be selected with a jumper on the back.
Product Ref: 220498
The A-111-3 has a fully analog triangle core circuit. It can be used in VCO mode for audio signals and LFO mode for modulation. The rates of each mode are:
These modes can be switched between using the switch on the front panel. The LFO mode's frequencies is about 1/500 of the VCO's. The oscillator can pitch track at 1V/Oct for 10 octaves. The available outputs are sawtooth, rectangle (controllable with PW) and triangle. There are several options for experts such as a DC offset for the triangle wave that can be accessed with the jumpers and trimming potentiometers on the back of the module.
There are 3 ways to modulate this oscillator. There are exponential and linear frequency modulations and for the rectangular waveform the pulse width can also be modulated. The main tune control can have its range altered using jumpers on the back. The options for this are:
There is an exponential frequency modulation input with an attenuator on the front marked XM. There is also a linear frequency modulation input marked LM. This is DC coupled so audio rate signals can be patched in as well. The pulse width can be manually adjusted using the PW knob from 0 percent (constantly at low) to 100 percent (constantly at high). The pulse width can also be modulated with the PM input, there is no attenuator for this input. There is a sync input that can be changed between hard and soft sync via a jumper at the back.
Please note: Images of the circuitry are of the A-111-3 and may look slightly different on the vintage edition