This circuit for signals up to 30 MHz can improve your reception in the medium and short-wave band. We found it in the Radio Electronics magazine of February 1989.
We found this circuit in the September 1985 issue of Radio Electronics magazine. It uses CMOS...
We find this circuit in an Electronic Design of the 90s. The used integrated circuit admits...
We found this circuit in English documentation for PCs from 1996. The ZN448 is a very uncommon...