The Thomas Henry VCO1 is a [Voltage controlled Oscillator/VCO](vco) for the Eurorack modular system. It has a coarse and fine frequency control and can output 3 different waveforms (PWM, Sine and Triangle). The pulse width of the PWM-output can be controlled via knob or control voltage. The output of the oscillator is constantly on – this is typical for oscillators in modular synthesizers. This is why it might be a good idea to pair them with a [Voltage controlled Amplifier/VCA](vca) or a [Voltage controlled Filter/VCF](vcf), which enables us to play the oscillator with different volumes, envelopes and timbres.
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[Calibration](th-vco1-calibration)
## Resources
- Our [adapted Version of the Oscillator](https://code.hfbk.net/t6/sdiy/tree/master/th-vco1)
- Our adapted Version of the Oscillator: [look at the Project Repository](https://code.hfbk.net/t6/sdiy/tree/master/th-vco1)
- Original Design for ±15V by Thomas Henry on [birthofasynth.com](http://www.birthofasynth.com/Thomas_Henry/Pages/VCO-1.html)
- Eurorack Version on [Tom Whitwell's repository](https://github.com/TomWhitwell/TH-VCO1)
- Modified version of the boards for the workshop on [David's repository](https://github.com/atoav/TH-VCO1)
