CMOS 7555 Core VCO

VCO / LFO

It features Linear AC and an Exponential FM inputs with attenuators, one Hard Sync input and a 1V / Octave tacking input, output and offset switch.

Connecting a signal to the EXP FM input will change the pitch of the oscillator.

The H-Sync and FM functions produce a full sound, and it octave tracks very well.

This VCO features four waveforms: Sine, Triangle, Ramp and Pulse wave.

There are trimpots for 1Volt / Octave tuning, High Frequency tracking, and Ramp wave connection. There are two trimpots for the sine wave: one for roundness and one for symmetry. The roundness trimmer also adjusts the amplitude of the sine wave a little.

This 7555 VCO also features a 3-way switch providing 3 frequency ranges: MID, VCO and LFO.

The back of the module allows you to 'pre patch' various functions.