This circuit keeps a set of lamps permanently on, even when there is a power cut. The circuit can be adapted to use LEDs and the 12 V battery can also be changed according to the lamps or LEDs.
This circuit, which appears elsewhere in this section, was taken from McGRAW documentation from...
This modulator circuit can be used in AM transmitters up to about 10 W of power. The TDA2002 must...
This circuit with low-slip characteristics uses an operating system that is not very common today....