AM8125 VCO

AM8125 Minerva Voltage Controlled Oscillator

This is a traditional sawtooth core VCO similar to many designs of the 1970's using dual NPN transistors and a capacitor based integrator. The waveform converters are similar to those in early Roland designs, from the Modular 700 onwards. The AM8125 provides the rich sound of true analog oscillator but with the precision of the 21st century.

This 16HP wide module has an ultra stable VCO core with precision power regulation and the latest HF trimming design. The dual transistor exponential generator uses a modern SSM2210 with a 1K Tempco resistor for temperature compensation. There is a 5 octave range switch (32 to 2 feet) and a Pitch tuning potentiometer for+/- 7 semitones.

The VCO produces the usual waveforms; Sawtooth, Square with pulse width modulation and Triangle. There is a sync facility with Off, Strong and Weak settings on a 3-way toggle switch. Pulse Width is variable from 10 to 50%, and there is external pulse width modulation as well as 2x Frequency modulation inputs.

This VCO module is setup for accurate 1V/octave tracking, using the high precision voltage rails. Please use an accurate 1V/octave MIDI to CV converter with the keyboard pitch voltage connected to the standard Pin 13 and 14 of the 16-pin Doepfer bus.

The AM8125 was produced in 2014-2015 as a completed module and is now discontinued.
A new version will be available in 2019..

https://amsynths.co.uk/home/products/oscillators/am8125-single-vco/