First from scratch mic build, AKG C12/414 capsule, JFET and transformed circuit based on u87 PCB. Never soldered a circuit board before but now I'm hooked. I could build 6 of these
Classic Schematics
AKG C12 / Siemens SM204 help needed | GroupDIY Audio Forum
AKG C12 VR och Telefunken ELA M250/251
AKG C12 VR och Telefunken ELA M250/251
ELEKTROAKUSTIKA® AKG C12 - condenser microphone
The AKG C 12 and the Telefunken ELA M 250, M 251
M12 DIY Microphone Kit - Vintage C12 Inspiration - Mic & Mod