This circuit is from an article in Radio Electronics magazine from October 1958. The circuit is for testing electrolytics that operate at high voltages depending on the source.
This receiver for listening to the TR-23 phone was manufactured in Japan in the 1960s. The circuit is...
This circuit is from a 1992 documentation, but the components used can still be easily assembled. The...
This circuit was found in the SGS manual of linear integrated circuits of 1982. The circuit...