Operating in class AB1, this high-fidelity amplifier was found in the 1961 RCA tube manual. The circuit has high input impedance and good gain.
In the figure we have an interface using an optical coupler and the comparator LM339 or any...
This circuit for cars with mechanical breakers (contact breakers) was found in the April 1969...
This circuit can be used to show the direction of current flow in semiconductors, such as LEDs....