This simple circuit found in a 1968 EEE was intended for data transmission over the telephone line. The components are from that time, some are uncommon today.
This LCD driver circuit uses a common component today. The circuit is from 90's documentation....
This circuit converts signals from 0 to 19 kHz into voltages from 0 to 1 V. The circuit is from a...
This simple 555 component tester was found in the November 1992 issue of Radio Electronics...