The mki x es.EDU VCO is the first educational DIY kit in this series. It is an analog sawtooth-core oscillator with a reasonably accurate volt/octave tracking, made from just a handful of basic components. It features sawtooth and pulse outputs as well as 1V/oct, FM, and PWM inputs.
NB! All kits in these series are simple and come with extensive user manuals, therefore we will not provide customer support in case your DIY build fails to function or similar.
More information found here – Erica Synths