This circuit was found in a Popular Electronics from the 90's. It consists of the solid-state variation of the well-known grid-dip meter. MOSFET is a component not very easy to obtain these days.
This converter has coils according to the reception and converted frequency bands. We found it in...
This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is...
This circuit uses common components in our market, despite being from a 1996 publication. The...