Found in an old American documentation this FM modulator makes use of a varactor diode. The circuit can be easily implemented given the small number of components used.
This circuit triggers a relay when the phone rings. An application is like remote doorbell. The circuit...
This charger sources currents in three ranges: 10 mA, 25 mA and 50 mA; Current is sellected...
In this circuit we show how it is possible to control a high power load (which depends on the...