This is an amplifier circuit intended for modulating transmitters. The 5-tube circuit is from an American manual from 1947. The power supply uses a transformer.
This circuit was found in National Semiconductor documentation from the 90s. The circuit uses two...
We found this circuit in the March 1984 issue of Radio Electronics magazine. The module used is a...
This circuit was obtained in an old Elektor and can be adapted to use white power LEDs. The...