This circuit for the 40 MHz band was published in Radio Electronics magazine in December 1957. Its purpose was to monitor the signals of the Russian satellite launched at the time.
Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is...
This re-triggerable circuit was found in the April 1988 Radio Electronics magazine. Timings are...
This circuit is intended to switch high frequency antennas using common diodes. The circuit is from...