LED strip with potentiometer howto

Thread Starter

zogorean

Joined Jan 12, 2013
11
Hello all.
I just purchased a 3m long LED strip and mounted it behind the bed hoping it would be a nice and cousy lightsource. However it shines too bright, and therefore I want to be able to adjust the brightness. The transformer outputs 12v 2amp max.

Can someone tell me what to do? Many thanks in advance.
 

MrChips

Joined Oct 2, 2009
22,872
You need a light dimmer circuit that uses pulse width modulation (PWM).

A 555 timer circuit driving a transistor would be one solution.
 

Alec_t

Joined Sep 17, 2013
11,867
I don't see how the circuit in post #3 provides PWM? The output from the 555 is constant-width pulses and Q2, although pulsed, is never switched fully on.
 

#12

Joined Nov 30, 2010
18,217
I don't see how the circuit in post #3 provides PWM? The output from the 555 is constant-width pulses and Q2, although pulsed, is never switched fully on.
Maybe that circuit is worthless. It's just something I picked up on AAC.
Then again, if O.P. never responds, it doesn't matter. :rolleyes:
If he does, I'll try to fix it.
 
Top