This converter has coils according to the reception and converted frequency bands. We found it in the October 1989 Radio Electronics magazine in an article that teaches its construction.
This 1995 circuit directly controls a triac. The triac, in turn, controls the external load. Times...
We found this circuit in a documentation from the 50's. The transistors are germanium types. The...
Found in Linear Technology documentation from the 90's, this circuit mixes two analog video...