This LED flasher was described in the Radio Electronics Experimenter magazine special issue of 1989. It was designed to be assembled with SMD components.
Found in a Philips documentation from 1968, this circuit detects the trimpot set input voltage....
This circuit can be connected to the output of alarms or sirens with the 555, CMOS or TTL,...
This simple capacitor tester, already covered in other articles in this section and on the...