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Topic: help with : shiftregister + fading (Read 3663 times) previous topic - next topic

Grumpy_Mike

#45
Jun 17, 2011, 07:14 am Last Edit: Jun 17, 2011, 07:21 am by Grumpy_Mike Reason: 1
That look fine if a bit over complex.
However the LEDs will be on when not addressed by the 138, so all you will do is to be able to turn one off.
You need to have the transistor acting as a top switch, that means they all have to be PNP transistors with the emitters to +5 and the collectors going to the LED / resistor to ground.
And attach the PWM signal to one of the enable lines of the 138 like you did before.

stregoi

Now it is working and thanks alot again Mike .. that was a great help !

this my finished project :

http://www.youtube.com/embed/_alfuhazGJE

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