Found in a 1967 American electronics magazine, this circuit has an input impedance of 2000 ohms. The circuit can be built with modern equivalent transistors.
This instrument was found in a publication for radio amateurs in 1973. The tuned circuit consists of...
This circuit was found in an American documentation. Its purpose is to allow the use of a digital...
The sensor used in this transistor is a common silicon transistor and the operational admits...