This circuit was found in an English magazine from 1977. Signal inputs and outputs must be shielded, and the circuit can be powered by battery, since its consumption is low.
This project makes use of a technology without many digital components and that can be easily...
This configuration was found in an English magazine from 1965. It is valid for any junction FET. The...
We found this circuit in a Radio Electronics from October 1963. The circuit uses an output...