This circuit from a 90s Popular Electronics, decodes the old analog TV signal. It works with a pilot frequency of 15 734 kHz from the scanning system.
This circuit locks when the sensors are opened. The relay can be 6 or 12 V depending on the power...
Found on an 80's Elektor, this circuit uses common components, being the diode a general purpose...
This circuit can either directly supply a piezoelectric transducer (BZ) or a stage with a...