This input circuit for an oscilloscope was found in Radio Electronics from the 90s. The operating circuit is from that time, and a modern equivalent can be tried out.
This 5.1 MHz circuit was found in a 1980s documentation. The frequency is given by the crystal and...
This radiation sensor circuit was found in the January 1994 issue of Electronics Now magazine. It is...
This project was found in a 1982 documentation. Super-regenerative receivers can combine great...