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.
This circuit controls the temperature of heating elements, which may be lamps covered with...
Obtained in documentation from General Electric this circuit consists of a biestable with...
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...