With this circuit it is possible to select transistors and their compliant test. Or circuit consists of an oscillator. Or transformer of the type found in old transistor radios.
We found this circuit in a 1965 publication by General Electric. The zener is 8.2 V x 1 W and the...
This circuit was found in a 1994 documentation. The transistors can be BC558 and BC548 and the...
This amplifier stage, obtained in a 1980 publication, has a low input impedance and a high output...