Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
The frequency of this circuit, which uses one of the LM139 comparators, depends on C1. The circuit...
This circuit, which uses a planar silicon sensor, is from a 1964 Electronic Design. The component...
We find this circuit in a documentation for engineers from 1971. The circuit generates rectangular and...