This telephone recording circuit was found in the June 1979 issue of Radio Electronics magazine. The components are common at the time and the power is supplied by the power grid.
Applying a high voltage to a mixed lamp can obtain a bluish light with a decorative effect. This...
We found this transistorized AM receiver of the regenerative type of excellent quality in a...
This circuit indicates the logical level of a CMOS circuit, extracting the power from the circuit...