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 1970 General Electric circuit is an equivalent configuration to the previous one with PNP...
This circuit was obtained in a Texas Instruments 2012 documentation, which consists of a current...
We obtained this circuit in a Maxim documentation from the 90s. The circuit is based on the...