If you are interested in analog synthesizers then a lot of the schematics and explanations of the circuits were published in magazines in the 1970's. I think E

If you are interested in analog synthesizers then a lot of the schematics and explanations of the circuits were published in magazines in the 1970's. I think ElectroNotes was one of the premier ones, but Radio Electronics, Polyphony, Elektor and others published circuits as well, with explanations of how they worked. Here are some leads: https://paia.com/polyphny/ https://paia.com/polyphny/ https://archive.org/details/radioelectronicsmagazine https://archive.org/details/radioelectronicsmagazine https://blog.adafruit.com/2022/02/07/70s-electronic-music-magazines-with-month-by-month-synth-projects/ https://blog.adafruit.com/2022/02/07/70s-electronic-music-ma... https://worldradiohistory.com https://worldradiohistory.com https://worldradiohistory.com/Elektor.htm https://worldradiohistory.com/Elektor.htm There are still some kits available as well to learn by doing: https://paia.com/p9700/ https://paia.com/p9700/ You can also get schematics for some classic synths: http://www.arpodyssey.com/schematics.html http://www.arpodyssey.com/schematics.html https://archive.org/details/arp_ARP_Quadra_Schematic https://archive.org/details/arp_ARP_Quadra_Schematic https://archive.org/details/ARP_Solina_Schematics https://archive.org/details/ARP_Solina_Schematics https://moogfoundation.org/schematics/ https://moogfoundation.org/schematics/