This RF amplifier step has a dynamic range of 140 dB and can amplify signals from 0.5 to 40 MHz. FET is old, but modern equivalents can be used.
This simple medium wave receiver was sold in the 1960s in Japan. The circuit used germanium...
This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are...
This frequency divider circuit that generates a ladder-shaped signal was found in the June 1968...