This circuit triggers an alarm when the mains power is cut off. The circuit was found in the July 1990 issue of Radio Electronics magazine.
This 32 A circuit uses SCRs of the time. We found it in a 90s General Electric documentation. The...
This amplifier stage with 1 power transistor was found in the Radio Electronics magazine of...
This transceiver is also low power, but this time, it can generate signals in the 144 MHz band. In the...