This circuit was obtained from an Electronics Design of 1964. The circuit makes use of tunnel diodes that are uncommon today. The circuit works with very weak signals.
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...