This 1.5W tube amplifier was found in an American documentation from 1947. It is a direct rectification circuit without the need for a power transformer.
This circuit is very interesting due to the range of practical applications it can have, from...
Originally, this circuit was created to monitor the liquid level in the reservoir of a car's...
We found this circuit in a 1977 Italian Elettronica Prática. BC107 can be replaced by BC547 and...