Low cost DIY kit to build a full-fledged analog synthesizer. The kit is made of an assembled and tested pc board that includes all that is necessary to build a standard analog synthesizer.
The version without temperature compensation is fine for experimental sounds or drum/percussion applications where the exact 1V/oct scale of the VCO is not essential. For applications where the synth has to be played by a CV keyboard or Midi/CV interface the version with temperature control is recommended. This version has a good 1V/octave tracking over about 6 octaves in the range 40Hz ... 5kHz after ~ 20 minutes heating period.