This 3-digit digital gauge was found in the July 1900 issue of Radio Electronics magazine. The circuit is based on the CA3161 and CA3162 A/D converters of the time.
Found in a 1990s Motorola documentation, this high voltage circuit uses a PUT that is not a common...
This circuit was found in a Popular Electronics from the 90s. The frequency range generated...
This circuit was found in a 1963 magazine, but can still be easily assembled with some current...