This shortwave preselector was found in the July 1994 issue of Radio Electronics magazine. The circuit is suitable for telescopic antennas, matching the impedance with the receiver used.
This simple charger for AA, C and D batteries was found in Elementary Electronics from 1977. The...
This analog video fader circuit smoothly transitions between two signals. It was found in the...
This circuit is based on an operational amplifier that is uncommon today, but that can reach the...