Click here to view a PDF of all the Design Ideas from this issue. Using a CMOS 555 timer and a single NPN transistor, you can drive as many as seven LEDs using a minimal amount of voltage and power ...

You know how it is. You’ve got that new project running, and while it doesn’t consume much power, it also doesn’t give much indication of whether it’s functioning or just sitting there ...

This is a small size led flasher built with the 555 timer IC that is powered from 2 x 1.5V batteries. The circuit can be used as a flashing metronome, dark room timer, memo-reminder or other similar ...

Finding that his recently purchased LED Christmas lights defaulted to an annoying blinking pattern that ... alternating 500 Hz square waves with a 555 timer and a 74HC74D dual flip-flop.

About my book to help teach those young and old about 555 timers. element14’s 555 timer contest ... to know programming languages. A blinking light led to an electronic switch to storing ...