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.
This circuit encodes the two channel signals from an amplifier for a multiplex-stereo...
The purpose of this circuit, which we found in the November 1986 Radio Electronics issue, is to...
This circuit is from an old American documentation. In it we have a simple way to fire an SCR from...