Skis kit

0,00 kr

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SKU: 270-0020 Categories: ,

Build your own synth modules. BASTL Effects offers synth modules and sound circuits as DIY kits.

Skis kit

dual decay + vca

In the front of every ski there is a curve similar to a decay envelope. Skis kit module has two channels A and B and each of them consists of a decay envelope with knob control and a VCA. There is a TRIGGER input to trigger the envelope, a buffered envelope output which is normalised to the CV input of the VCA. Than there is SIGNAL IN and OUT of the VCA.

There is also a CRUNCH switch which activates a special mosfet lo-fi VCA circuit inspired by designs of Standa Filip. This adds a slight crunchy character which changes with the decay of the envelope.

A typical application of Skis is to take two signals (noises for example) and generate drum sounds with adjustable DECAY from them with a TRIGGER signal. However, you can also use the two VCAs and two DECAY envelopes independently.


  • dual decay envelope with adjustable decay time (trigger input, CV output)
  • dual vca (signal IN, signal OUT, CV IN is normalized to CV output of decay envelope)
  • crunch feature inspired by circuits of Standa Filip
  • jumpers for changing the decay envelope to release envelope (vca is on full while there is a gate signal and than it decays)
  • jumpers for enabling the decay knob to completely mute the decay envelope
  • jumpers for selecting weird filtering of the output signal (also inspired by Standa Filip)
  • front panel from oak wood, handmade custom knobs

Technical details

  • 5 HP
  • current: +12: <30mA, -12: <20mA
  • 35mm deep (skiff friendly)
  • PTC fuse and diode protected 10 pin power connector


Level of difficulty:
Download the build instructions to Skis kit
Download the schematics to Skis kit
Download the user’s manual to Skis kit


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