This simple circuit for headphones or small speakers was found in documentation from the 90s. The circuit works with voltages from 5 to 9 V and has good gain.
This circuit is interesting for experiments and can be part of the bench in the form of a module. The...
This RF wattmeter was found in an American 1980s documentation. The components are common and the...
The configuration shown allows to obtain a high voltage gain for FETs. FETs can be BF245 or...