AM8111 VCO & VCF (KIT)

£79.00 inc. tax

OVERVIEW This is a partial kit for building the AM8111 module, which is a replica of the Roland 100M 111 module, a prototype that Roland made in 1978 but without taking it into production. It is a combination of a VCO and a VCF in the same module. The original 111 has been re-imagined by using the oscillator from the SH-101 and the filter from the Korg Monopoly. New sounds!

DESCRIPTION The VCO is based on the Coolaudio V3340 chip with additional trimmers to enable easy setup, and precision voltage rails to ensure pitch stability. The VCO has three waveforms; Triangle, Pulse, Sawtooth along with a sub ocillator one octave below. The VCO has sync with two strengths (weak, strong) selected by a slide switch. The main outputs of the VCO are normalised into the signal inputs of the VCF.

The Korg Monopoly style VCF is based on the Coolaudio V2044 chip, with a slide switch to select whether the envelope input is inverted or not. Q compensation has been implemented to ensure there is no signal level drop at higher resonance settings. The filter is trimmed to go into self oscillation at the maximum resonance setting.

There are trimmer pots for the audio and CV inputs, slide pots for frequency cutoff and resonance, and a rotary controls for VCO range and pitch. The module is designed to work with audio signals up to 10V p-t-p and CV signals from 0 - 10V. There are green and red LED's on the VCF, which represent signal active and signal overload.

CONNECTIONS There are 16x 3.5 mm jack sockets on the front panel:

3x VCO CV inputs
1x Pulse Width input
1x VCO output
1x SUB output
VCO sync input & output
3x VCF audio inputs
3x VCF frequency cutoff CVinputs
2x VCF outputs

The module comes with a set of M3 mounting screws and washers, and a standard Eurorack 10-pin to 16-pin power cable.

KIT DETAILS The kit contains the powder coated panel, two PCB's with all the SMD components ready assembled including the V2044A and V3340 chips, a 100KA slide potentiometer, a red LED and a 6-way rotary switch. The customer needs to solder in the THD components; potentiometers, LED's switches and jack sockets.

IMPORTANT NOTE: A digital voltmeter that can measure down to 1mV and a frequency meter are needed for setup. A DAW based tuner can be used instead of a dedicated digital frequency meter.