This circuit is from Delco Radio found in a 1968’s documentation. The transistors are of the time and are not given information about the driver transformer. Note the high supply voltage.
The integrated circuits used in this 1989 project are uncommon today, including the IF coil that...
This negative bias circuit provides negative voltages from 3.5 to 6.5 V sources. The circuit was...
This low noise, low frequency instrumentation circuit was found in a 1976 NASA circuit manual. The...