You've reached the Synthesizer DIY pages of René Schmitz!
A word about analog music
If you are looking forward to build any of the stuff or if you have any questions regarding the material presented here, feel free to send me a mail (in English or German) I sometimes have ideas for little additions or improvements, but I don't have time to present all of them here.
The OTA tutorial by Gene Zumchak
An in depth look on OTAs by Achim Gratz.
Whats that exp and tempco stuff?