This receiver was found in a Popular Electronics from the 90's. Its different configuration shows a tuning circuit after the tube that works as an aperiodic amplifier. Observe supply voltages.
Found in a Popular Electronics from the 90s, this circuit uses components that are still current....
This circuit is based on an operational amplifier that is uncommon today, but that can reach the...
The sophisticated white noise generator we present uses four 741 operational amplifiers. The...