Cmos-flasher


Posted on Dec 6, 2012

Uses a low cost CMOS IC to tum four LEDs on and off at a rate that is set by the values of R1, R2, Cl, and C2. The pulse rate for the component values given for R1 and R2 is about one cycle every four seconds. By lowering the values of Rl and R2 to 220 KO, the pulse rate increases to 1Hz. The LEDs flash in pairs, with LEDl and LED4 turning together for one half of the time period, while LED2 andLED3 are on for the other half.


Cmos-flasher
Click here to download the full size of the above Circuit.

The on/off duration of each pair of LEDs can be increased or decreased by changing the value of one of coupling capacitors C1 or C2. Increasing either capacitor"s value by a factor of 10 will also increase the ON time of a pair of the LEDs for about the same factor.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Fastest Finger First project
DC to DC Converter
Tube Headphone Amplifier II
20W-audio-amplifier
1Khz Square-Wave Generator
project Huminator
hard disk switch schematics
pmw driver circuit class d amp
mini logger circuit
PIC IR Decoders
Transistor Tutorial Power Amplifiers Part 4
2.5V voltage regulator circuit
High-quality preamplifier



Top