This 10 A solid state relay was found in a 1980s documentation. It can work as a shield and implemented with modern equivalent transistors.
With this simple circuit found in an American 1980s documentation, it is possible to determine the...
This page shows a crystal oscillator for 2 MHz. Other frequencies can be produced depending on the...
This is a converter stage found in old transistor superheterodyne radios. The circuit is for...