Timer LM555 Circuits


Posted on Oct 17, 2012

The following are LM555 timer circuits that have unusual functions. Designed to time a sports event; In this circuit the GREEN output is adjusted to be on for 3 minutes and then the RED output is set for 1 minute in a repeating cycle. Each time the light changes a buzzer will sound for about 2 seconds.


Timer LM555 Circuits
Click here to download the full size of the above Circuit.

The timing cycle can be stopped and reset/started with the push buttons shown on the schematic.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Tin Can Waveguide WiFi Antenna
Advanced Power Switcher
Changing the sensitivity of manual controls
Doorbell Phone
USB As A Power Source
HOW TO make a cheap narrowband A/F gauge
Quadraphonic Amplifier
Fly auto disinfestation effect circuit



Top