This circuit uses common components at the time of its publication in the 1980s. The circuit can be made with modern equivalent transistors. The input signal is sinusoidal.
This circuit was obtained from Dutch documentation from 1967. It uses transistors of the time...
This very low resistance meter was found in the February 1995 issue of Electronics Now magazine. The...
This 700 Hz centered high selectivity circuit was found in the 1980s Magazine Magazine for Amateur...