This wired control circuit serves both volume and balance between channels. We found it in Radio Electronics magazine from August 1968. Transistors are common general-purpose types
This is a basic version of the Tesla coil that does not use semiconductor devices, found in an old...
This oscillator uses germanium transistor avaialble in 1958 when the project was published....
This circuit amplifies signals from low impedance sources as microphones, transducers, etc. For...