LM3900 Amplifier (CB25165E)

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

Automatic TV turn off (CB10090E)
This old circuit from a documentation from the 70s disconnects a TV from a signal obtained on the...
20 Wrms Transistor Amplifier (CB17226E)
This traditional complementary symmetry circuit provides 20 W of rms power at a load of 8 ohms...
Constant current source (CB21992E)
Using a CA3130 and a power transistor, this circuit can deliver a current of up to 500 mA with the...