We found this circuit in an English publication from the 60's. The transistors are of germanium of the time and the headphones must be high impedance magnetic.
Found in National Semionductor documentation this circuit combines a tone control with an...
This circuit was found in American documentation from the 90s. It serves as an amplifier for a...
With a coil formed by 7 turns of 26 AWG wire this circuit operates in the 27 MHz range. But you...