The integrated circuit used in this application is uncommon, but equivalent operational ones can be used. The circuit is from the Signetics integrated circuits manual from 1972.
This transistor tester was found in a publication by Gernsback from 1960. The circuit can be used...
This simple power supply, which is equivalent to 2 AAA or AA batteries, was found in an Elektor...
We found this circuit in an American publication from the 90s. The transistors must be provided with...