These are my build notes for the nonlinear circuits "Is Carp Lust Wrong?" module.
It's a eurorack module.
What exactly is it?
It's a module loosely based on the Karplus Strong algorithm.
Karplus Strong is a pretty obscure synthesis method developed in the 1980s and used in physical modelling mainly of plucked strings
It was named after its principal inventors, Kevin Karplus and Alex Strong.
Think about how a acoustic string instrument works.
When you first pluck the string it vibrates like mad. It has waveforms which are rich
in harmonics. These initial waveforms are determined by the mass and tension of the string.
After being plucked, the string looses energy over time and becomes less complex, resulting in a "purer" tone with fewer harmonics. Eventually, the vibration stops, when all the energy is gone.
Basically the module works by exciting the delay with a burst of noise and running the feedback up...& changing the delay time to change the pitch and tone.
Links
+ Wiki
+ BOM..
Some of the parts aren't super common so I'll probably need to do a order from mouser
(or your fav supplier) I think.
LM78L05 - +5V voltage regulator
LM13700M... yes
555 timer .... its a NE555 (yes)
BC857 x5 , BC847 x4
S1JL rectifier (the dot is the cathode)
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Waiting for parts....
V3207 or V3205 BBD chip ... order ... you only need one of these !!!!
The V3207 is a cool audio replacement for the 1024-stage BBD analog delay Panasonic MN 3207 chip.
I ended up buying a DIP 8 coolaudio V3205 chip on ebay.
5v1 zener...on order ... tayda
I ended up using a 5V6 zener
J309 FET
CD 40106
..
.
