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.
November 2016 - Already available from Mouser Electronics on Texas Instruments' new DS280BR820...
This circuit found in a 1988 documentation consists of a timer or sequential timer controller. The...
This astable multivibrator has an emitter coupling between the transistors. The circuit is from...