Go Down

Topic: UNO + unstable PWM + Linear Led Drive (Read 4410 times) previous topic - next topic

yabbasha

bit flickery still
moving on to RC filter tomorrow

pwillard


yabbasha

is fun...but still not working properly... for some reason I  still cannot figure out, when I follow the last schematic don't get a result. Tying to figure out why.

Grumpy_Mike

But what result do you get? Can't help if you don't say what is happening.

yabbasha

On a white only LED thru the circuit, any input from the Arduino causes a flicker: with no input shines at 60%, any input (even what would be a 255) dims it, flickers and when the signal is gone, it goes back to a steady glow. And even better, when I use colour LEDs, the colour changes on top of the flicker.

Grumpy_Mike

Well it looks like you cannot dim that strip with a PWM signal. Probably due to the beating between the PWM frequency of the arduino and the PWM frequency of the strip.

So what capacitors have you tried and where?
I would suggest that you have one between the base and ground. Start of with 10uF or so. Be prepared for your transistor to get hot because it will be working in the linear mode.

Go Up