[sdiy] Three more working PCB demos from this semester's synth class

Jeff Brown guitaricon at verizon.net
Tue May 5 03:08:17 CEST 2015

Wonderful stuff!  So where did you find the schematic for the 148?

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Lanterman, Aaron
Sent: Monday, May 04, 2015 4:32 PM
To: synth-diy List
Subject: [sdiy] Three more working PCB demos from this semester's synth

Though some of y'all might enjoy these.

Four-pole lowpass VCF with a 3D printed LED/LDR package (four LDRs around a
single LED) for the main filter blocks, with another LED/LDR combo for VC


A four stage wave folder in the style of Serge and Ken Stone, with the first
two stage having JFETs in the feedback loops of the op amps acting as
nonlinear variable resistors providing a weird control input:


The 3rd, 5th, and 7th harmonic wave shapers from the Buchla 148 (twiddled to
use a +15/-15 V supply)


I am so fortunate to be able to do this class! This is so much fun.

- Aaron
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