This 455 kHz IF calibration circuit uses a 4,096 MHz crystal. The circuit can be powered by voltages from 5 to 9 V.
This circuit with integrated TTL 7400 has a good teaching purpose, drawing one of two LEDs. The...
Found in American documentation from the 70s, this circuit uses components of the time, uncommon...
This circuit makes use of a diac to stop the activation of a sensitive reed relay 1 mA. The trip...