LM3900 Amplifier (CB25165E)

This circuit with Norton operation is from an article in Radio Electronics magazine. The gain is given by the resistors.

Amplifier with Class B output (CB22234E)
This class B push-pull amplifier circuit with a few hundred milliwatts of power was found in an...
Window detector using one comparator (CB20901E)
In the figure we have a window detector that uses only a voltage comparator. The circuit can use...
Resistor voltage control (CB20758E)
This circuit was found in an old American documentation. The operational used is of the...