This interesting reflex receiver used a different component, which at the time was showing up. The receiver is from a 1924 documentation and used a sodion tube.
This circuit was found in the September 1984 issue of Radio Electronics magazine. The frequency is given...
We found this circuit in an Argentine documentation from 1973. The transistor admits a more modern...
This triac synchronized circuit was found in the July 1995 issue of Electronics Now magazine. The...