BASTL Dynamo – Full DIY Kit

£85.00 £72.25 (Excl. VAT)

Envelope Follower, Comparator & Voltage Controlled Switch

This module has an Oak Wood Panel

In stock


BASTL Dynamo is combination of 3 utility functions: an envelope follower, a comparator and voltage controlled switch. Dynamo combines its envelope follower and comparator to extract gates from envelopes. On top of that there is full-wave rectifier output |EF IN| and compressor CV curve generator. When the Compressor CV is plugged into the CV input of a VCA featuring offset and attenuator controls then you get a compressor! The threshold knob on Dynamo sets the compressor threshold, offset on the VCA sets the gain and the attenuator on the CV input sets the ratio of compression (which can also go negative). This allows you to create compression style effects from anything: VCAs, tube modules, VCFs or anything else that comes into your rack!

The other feature of the Dynamo is it’s voltage controlled switch section in combination with the full-wave rectifier and comparator. All pre-normalised and for what reason? Make “fake thru-zero modulation” with anything you like! Define what happens when the negative modulation is happening and adjust the zero crossing point with CV. A whole world of very deep modulations is waiting for you now… and it’s totally bonkers!


  • Two passively connected Envelope Follower inputs (multiple)
  • Inverted and non-inverted Envelope Follower Output
  • Full-wave Rectifier Output |EF IN|
  • Compressor CV Output with indication LED (only negative voltage when envelope is greater than the threshold)
  • THR-EF output is similar to compressor CV but can go to positive voltages – it tilts the whole compressor dynamics curve (not only the part above threshold)
  • selectable Envelope Follower Release time (Short, Mid, Long)
  • Output of Envelope Follower is normalised to Comparator Input
  • Comparator with Threshold knob, Threshold CV, Input and Output
  • Output of Comparator is normalised to the Gate of VC Switch
  • Voltage Controllable Switch is bi-directional (non-buffered) A or B switch
  • VC Switch Gate threshold is around 1.5 volts
  • On high gate the B signal is connected with A or B connector (otherwise it is A)
  • Signal on A is inverted and normalized to B (easy to achieve bi-polar VCA emulation or other waveshaping)
  • Width: 5HP, Depth: 35mm
  • PTC fuse and diode protected 10pin power connector
  • Current consumption: +12V: <30mA, -12V: <35 mA


  • complete assembly guide pdf
  • schematics pdf
  • board diagram pdf


Additional information

Weight 0.1157 kg
HP Size

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