This 10 A solid state relay was found in a 1980s documentation. It can work as a shield and implemented with modern equivalent transistors.
This is the receiver for the previous transmitter, also using a transducer not very common in our...
Here we have a transceiver for the amateur radio range, which operates in the 40 m band (7 MHz),...
The integrated circuit used in this circuit is not very common, but an equivalent one can be...