This differential amplifier, found in a 1964 Electronic Design, has a gain of 30. The setting can be applied to modern equivalent transistors.
In the figure we have the way to use a voltage comparator powered by a voltage to control a...
This circuit was found in an old Poptronics but is still current as transistors can be replaced...
This dimmer for incandescent lamps is one of the many found in this section. This was obtained...