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.
The frequency depends on C, which must have the indicated value ratio, and also on R, which can be...
Found in American documentation from the 1970s, this circuit is intended for amplifying analog TV...
This configuration makes use of an integrated circuit of the time having been found in a 1976 NASA...