This circuit is from an American 1964 documentation. Transistors of the time are used, but modern equivalents can be employed.
This 9 W amplifier with transistors from the 60's was found in documentation of the time. The...
This circuit was found in an Elektor from the 90s. The circuit is critical, requiring a very...
In the figure below we have a simple way to perform a function test for a solar cell. The circuit is...