It actually consists of a tunable field strength meter. The circuit is of an old documentation and the circuit must be tuned to the frequency to be monitored. The circuit offers the option to use a headset.
In the figure we have a way of obtaining a 13,2 V with current up to 5 A using an integrated 7812...
This switch is triggered by the touch of the sensors, which can be two metal plates. These plates...
This traditional doubler configuration with the 555 IC can be found in other articles on the...