This circuit was found in a 90's EDN. The circuit provides two 15 V outputs and one 5 V output from the 12V voltage of a car battery. The components are from that time.
16 commercial test circuit for tubes and transistors appeared in Radio Electronics magazine in...
Suggested by an American publication, this circuit has 5 operating conditions indicated in the...
This circuit with an integrated circuit of the time was found in the magazine Radio Electronics of April...