Bubblesound VCOb – Full DIY Kit

£113.00 (Excl. VAT)

Triangle Core Analog VCO with FM, Sync and PWM

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SKU: Kit_Bubblesound_VCOb Categories: , , Brand:


The VCOb is a voltage-controlled analog oscillator based around a classic triangle core VCO. The range of the VCOb is one of the widest in the analog modular world. And like all triangle cores the real fun is in the FM. Since we’re starting with a triangle core it’s easy to produce a real Sine wave output. There is also Saw and Pulse outputs. The Pulse will almost become fully positive or negative with the pot, and will go all the way open and closed with CV.

The VCOb offers FM in both the Linear And Exponential varieties. With FM set to full in Expo mode this will act as a second 1V/Oct input for things like transposing. The tracking is all analog and will give 4-6 octaves, depending on how picky you are. It is very stable and they do track together very well.

VCOb Build Document – Assembly Guide


  • Outputs: Saw, Pulse, Sine, Triangle
  • Range: 10 Second cycles – 21.4K Hz
  • FM input with linear and exponential mode
  • Pulse Width Modulation & Sync inputs
  • Width: 8HP
  • Depth: 40mm
  • Current draw: 100mA@ +12V , 100mA@ -12V , 0mA@ +5V

Additional information

Weight 0.215 kg
HP Size

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