up down fading led


Posted on Feb 5, 2014

These two circuits make a LED fade on and off. The first circuit charges a 100u and the transistor amplifies the current entering the 100u and delivers 100 times this value to the LED via the collector-emitter pins. The circuit needs 9v for operation since pin 2 of the 555 detects 2/3 Vcc before changing the state of the output so we only have a maximum of 5. 5v via a 470R resistor to illuminate the LED.


up down fading led
Click here to download the full size of the above Circuit.




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