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 ... and created his two alternating 500 Hz square waves with a 555 timer and a 74HC74D dual flip-flop.

When the input is 1.25 V and the LEDs are connected, the voltage pulse level will be 23V. The LED driver uses a CMOS 555 timer since it operated with low voltages and can work for about 190 hours when ...

It’s a freeform circuit that synthesizes sound using 555 timers ... in the form of a RGB LED. One with a self-contained circuit to cycle through various colors and blinking patterns.