diy - DIY & Electronics

>>1301
There is too little information available to give an exact answer. It depends on what the electrical circuit that makes up the led tape looks like.
0-12V regulators are probably not what you want anyway, leds are not like incandescent bulbs in the way that the light output can be easily regulated with a variable voltage.

If it's just something like leds and resistors you might be able to dim the colours by e.g. individually PWM-ing the r/g/b power connections. If you want to string together a few 555's and passives, or go full arduino is up to you.

>>1302
Actually there is no reason you can't do it via varied voltage, that's just not true. The brightness to voltage might not be linear but you can certainly do it.

Though it is probably easier to do it with a PWM. If you want to use 555s use one as a an astable oscillator and have another one set up as a one shot. By varying the resistance on the one shot via a potentiometer, you can change the duty cycle.

>>1301
>>1303
>do it with a PWM

This...
3x http://www.ebay.com/itm/PWM-DC-6V-12V-24V-28V-3A-Motor-Speed-Control-Switch-Controller-/221714218228?hash=item339f327cf4:g:PzwAAOSwNSxVAnlB

and you will have lots of colours!

>>1303
I did not claim it to be impossible, what I meant is that due to the diode I-V "knee" it is not as easy as regulating an incandescent lamp, especially if the datasheet for the diodes are not available as I would guess is the case for a ropelight.

I do wish that linear dimming of led lights were more common though, or at least done using /high/ frequence pwm. I've seen too many car back/brake lights that appear as multiple lights during eye saccades.