Found in an April 1977 Radio Electronics issue, this circuit uses the well-known XR2206. The C1 values for the various frequency bands are given next to the diagram.
This game consists of a variation of the Nerve-Test with the difference that errors are indicated...
Found in a National Semiconductor manual from the 90's, this circuit uses components of the time,...
This bench power supply was found in Radio Electronics magazine from February 1962. The...