Receiver for the 40m band LM602 (CB25305E)

This circuit uses an FM IF transformer for tuning. The circuit is from a Radio Electronics magazine from April 1990.

Neon high voltage regulator (CB8804E)
Found in a1969’s neon lamp documentation, this circuit uses a high voltage transistor. The output...
FET matching Impedance circuit (CB19551E)
This circuit is intended to match impedances for observing signals on an oscilloscope. The FET...
Variable Gain Instrumentation Amplifier (CB15876E)
This circuit, shown in the figure, consists of a variable gain amplifier with differential input...