Found in an American documentation from the 90s, this circuit has a configuration that has been extensively explored in other articles on this site. The FET can be the MPF102 or equivalent.
This circuit with 5 V power was suggested by Motorola's Linear Databook of 1990. The circuit has...
We found this circuit in a 1982 documentation. An intercom to be good must be sensitive and have...
This circuit is indicated to determine the flight time of an electric motor model airplane. The...