4hp Dual Voltage Controlled Oscillator

The Dual VCO is a 4hp dual voltage controlled oscillator. Each VCO has square, triangle, and sine wave out, coarse and fine tuning controls, a control voltage input, and a switch for selecting exponential or linear cv in.

When a control voltage is inserted, the fine tune control becomes an attenuator for the incoming voltage. In exponential mode, when the attenuator is fully clockwise, the VCO will track around 5 volts per octave.

Each VCO runs from 5 seconds a cycle up to 18k hz

Very Stable, Temperature compensated

There are two main flaws to this 8038 oscillator design

Below 400 hz the waveform symmetry is a bit off. the further down you go in pitch, for example, the triangle wave will start looking like a saw wave shape, the sine will get a little floppy, and the pulse width narrows a bit for the square.

Also it doesn’t track 1 volt per octave perfectly. usually the 2nd and 4th octave will be a couple cents off.

Other than those idiosyncrasies, it is a powerful, stable dual oscillator in a small footprint with no cross talk between oscillators. It’s great for: drones and beating sine or triangle waves, cross modulating itself for interesting clocks/LFOs, creating complex waveforms/timbres through lin/exp frequency modulation.

DIY kit: $145
Pcb/panel: $35

http://zlobmodular.com/

• 20 mA +12V
• 38 mA -12V
• 0 mA 5V
• 45 mm Depth

Available as an assembled Module and as a DIY project.

This Module is currently available.