These are my build notes for the NonLinearCircuits Dual LFO & difference rectifier (Eurorack version).
It's a easy build as all parts are through the hole.
There are two op-amps used : a TL074 & a TL072
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Andrews build notes are here:
http://www.sdiy.org/pinky/data/WAMOD10%20dual%20LFO.pdf
and his blog notes are here:
http://nonlinearcircuits.blogspot.com.au/2015/03/dual-lfo-with-difference-rectifier.html
This LFO uses a combination of integrator & schmitt trigger. It's quite a commonly used combo.
Useful links.
+ Video - VCO using a Schmitt trigger & integrator.
+ Pdx.edu VCO
+ Falstad.com
+ Thomas Henry - The birth of a synth
+ The two amp oscillator
+ Circuits Today
+ What is a schmitt trigger and how it works
It's a easy build as all parts are through the hole.
There are two op-amps used : a TL074 & a TL072
Andrews build notes are here:
http://www.sdiy.org/pinky/data/WAMOD10%20dual%20LFO.pdf
and his blog notes are here:
http://nonlinearcircuits.blogspot.com.au/2015/03/dual-lfo-with-difference-rectifier.html
This LFO uses a combination of integrator & schmitt trigger. It's quite a commonly used combo.
Useful links.
+ Video - VCO using a Schmitt trigger & integrator.
+ Pdx.edu VCO
+ Falstad.com
+ Thomas Henry - The birth of a synth
+ The two amp oscillator
+ Circuits Today
+ What is a schmitt trigger and how it works