This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms and excites a load of 16 ohms. The integrated circuit of the time is the PA237.
This circuit is from 1983 documentation. The author shows us an experimental circuit of a siren...
This simple circuit indicates whether at a point in the wiring of a car 12 V is present. The clip...
This oscillator employs a Motorola operational amplifier common in the 70s. We can implement the...