This circuit for a frequency of 40 kHz was found in an old Electronic Design. There were no constructive data for the transformer used in the output.
Found in a 90s Popular Electronics, this circuit checks if a remote-control transmitter is...
This circuit for a decorative robot was found in the April 1988 Radio Electronics magazine. The...
This siren circuit was found in a Popular Electronics from March/April 1969. We can easily...