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, with adjusted sensitivity, can use common general-purpose transistors. The circuit is...
This circuit was found in a 1967 RCA documentation. The semiconductor components are from the...
This is the traditional configuration of na Astable Multivibrator using two NPN ttransistor....