[sdiy] cheap sine wave osc

[Paul Perry]

Sergio Franco has quite an analog synth history, as it happens.
He did the electronic design for the Sal-Mar Construction
http://ems.music.uiuc.edu/~martiran/HTdocs/salmar.html
which I consider the high point of 'playable' e-music.

And he wrote the best college textbook I have seen on analog design,
"Design with operational amplifiers and analog integrated circuits".

Paul perry Melbourne Australia
 
-----Original Message-----

Take a look at Figure 13 in these college lab notes:
http://online.sfsu.edu/~sfranco/CoursesAndLabs/Labs/445LabsPDF/445Lab1.pdf
A sine osc with one opamp, two diodes, two caps and five resistors.
There is a pot shown, but this can be replaced with a selected resistor.
the frequency is set by R=R1=R2, and C=C1=C2, f=1/(2*pi*R*C).
P.S. the author wrote a very good paper on discrete OTAs and their use 
in filters years ago:
http://yusynth.net/archives/ElectronicDesign/S-Franco-OTA-VCF-1974.pdf