This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a carrier. The used components are not common today.
Other operational amplifiers of the same series can be used on this circuit found in Motorola's Linear...
This circuit uses a capacitor to store energy. The capacitor is charged by closing S1 by a moment. Them,...
Other amplifiers of the series like the MC3301, MC3401 and LM2900 can be used in this circuit. We found...