Found in documentation from the 1980s, this circuit can have several adaptations to use modern transistors and LEDs instead of the lamp. The power supply voltage can also be changed.
The power of this small amplifier reaches 150 mW depending on the voltage and the load impedance,...
This circuit drives an old tape recorder when an audio signal is received. The circuit is...
Critical components of this project are the Geiger tube and the 300V battery. The battery can be...