Compact VCO / LFO with a range of waveforms and modulation

The t01 VCO from Thonk Synth is a 4HP Eurorack analogue oscillator with triangle-core. This compact VCO packs in plenty of features including LFO mode, octave switching, hard sync and linear FM.

The t01 can track up to 8 octaves and has dedicated Sine, Triangle, Saw and Squarewave outputs (10Vpp). The pulse-width of the Squarewave can be modulated via CV and there are separate coarse and fine pitch controls for easy oscillator tuning.

The VCO core is based on the super stable SSI2131 chip from Sound Semiconductor. This module is part of a new range of DIY Eurorack designed in house at Thonk HQ.

Features:

• High quality triangle core oscillator
• Linear FM and 8 octaves of tracking
• Sine, Tri, Saw & Square with PWM CV
• LFO mode switch (200 secs to 80Hz)
• Coarse & fine pitch & Octave switch
• Hard Sync input
• Designed in-house at Thonk

Specs:

• Width: 4HP
• Depth: 37mm (including power connector)
• Power: +12V 30 mA, -12V 26 mA,
• VCO Range: 0.5Hz – 8Khz
• LFO Range: 200S (0.0047Hz) to 12mS (80Hz)

Build Document | User Manual

Calibration can be done easily using the AtoVproject Single Pass Oscillator Calibration Tool

https://www.thonk.co.uk/shop/thonk-synth-t01-vco-kit/