Found in Popular Electronics from the 90s, this circuit uses still common components. Its power is 20 W, requiring care when winding the transformers.
This voltage amplifier with operational amplifier was found in an old documentation. However, it can...
This circuit was found in a 1967 US documentation. The FET is general purpose and the 6V zener....
This common configuration is one of many that can be found in this section using the 555. The...