Penfold synthesiser

The Penfold synthesiser is a basic synthesizer based on the circuits described in the Babani book Electronic Synthesiser Construction by R. A. Penfold, published in 1986.

Description
The synthesizer has the usual VCO-VCA-VCF voice, the book also includes an ADSR envelope generator, several simple sequencer circuits and a pseudo-stereo circuit using a simple phase-shift circuit.

Modifications

 * 1M for RV101 and RV102
 * 2.2uF for C101
 * 10k for the volume pot
 * Op-amp buffer outputs
 * Add a unity gain buffer to the AR
 * Use star wiring for the power supply rails instead of daisy chained

YouTube

 * R.A.Penfold DIY synth by David Hewitt, May 2017
 * Home made analogue mono-synth from the R.A.Penfold book "Electronic Synthesiser Construction". by Techno Workbench, May 2012
 * Home made analogue mono-synth from the R.A.Penfold book "Electronic Synthesiser Construction". Vid2 by Techno Workbench, May 2012