Published in the September 1973 issue of Radio Electronics magazine, this diagram may be useful to restorers, since the integrated circuit is no longer manufactured.
This circuit was obtained from an American publication of 1982, but can be assembled with ease...
This simple test for general purpose NPN and PNP transistors was found in a 1974 publication....
This circuit was obtained in an American documentation from the 80's. The transistors can be...