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 was obtained in a Motorola documentation from 1966. The circuit can use a common FET...
Found in Electronics Now from the 90s, this circuit can use any general-purpose transistor. The power...
The integrated circuit used in this trigger is uncommon today. We found it in a documentation from...