With this passive circuit it is possible to modulated in amplitude a low intensity RF signal. The circuit is from old American documentation and uses a germanium diode as its main component.
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...
Found in an Elektor from the 90s, this circuit triggers a Sonalert-type buzzer when the sensor is...
This two-digit (up to 99) circuit divides a signal by values programmed by the BCD switches. The circuit...