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.
Found in a publication by Gernsback from 1960, this circuit makes use of germanium transistors of the time....
To control relays or DC motors safely with double isolation via the parallel port, we suggest the...
This circuit is from a 1975 Sperimentare (number 11). The circuit uses optical coupling for a...