Tre Modular Alisa VCO

Tre Modular – Alisa VCO is based on one of the most unique soviet synthesizers Alisa 1377.

Alisa VCO offers three classic waveforms Triangle, Ramp and Pulse. In addition to those waveforms there is a waveshaped signal output that serves as a fourth waveform. Waveshaper is the most well known part of Alisa 1377. In Alisa VCO the shape of this signal can be manipulated with a knob or with Control voltage.

Alisa VCO has an exponential FM input, level of which can be controled with its dedicated control knob.

This VCO offers control of the pulse width of the pulse wave both manually and with Control voltage. Pulse width has two modes that are set on the back of the module with a jumper. In one mode it goes from 10% to 50% duty cycle and in the other it goes from 10% to 90% duty cycle.

Alisa VCO is temperature compensated using a transistor pair on a chip and a Tempco resistor that are thermally coupled. We chose both a transistor pair and Tempco resistor in the smallest package that we could get our hands on for additional temperature stability.