:? Hi everyone, I am looking for ideas or help for a project to wire up some RGB LED's I need to create a 3-channel circuit that continuously and randomly varies the voltage on each channel up and down (smoothly) from 0 to 5 VDC fed from a 12VDC supply. If anyone has any thoughts they would be most welcome.
Cheers all
J M West

 

so you mean that you wanna use random voltages for each channel so you can get lots of colours randomly?
why random?
maybe better if you can use a potentiometer to vary the voltage for each channel and produce the light colour you want.

 

I am planning to use this as a method of getting a custom motorbike fuel tank to randomly change colour at night, I can cover the tank OK and have tried this with single colour LED's, using a manual method of changing colour would have me trying to ride the bike and pick a nice colour at the same time - not very safe.
Cheers
J M West

 

Hi,

i build a cricuit that does what you want. It consists of 3 triangle oscillators running freele at different frequencies. The effect is a slowly changing color pattern.

Just have a look at my website - it's in german, but the picutres speek for themselves .

http://www.quantensingularitaet.com/...all/color.html

DoS

 

o, i like your idea very much!!!
but maybe you can explain in english how the circuit works, and about the other thing that you heve build.....the cuant beam rezonator(Quantenresonanzbeamer-did i get the translation right?)
what is it really?

 

Hi,

the circuit is pretty simple. Just build a triangle oscillator (1/2 LM324) for each color channel. I stole the schematics for that anywhere on the net ;-)
Build three of them using different time constants (== Cs) for each channel.
The output transistor works as a current amplifier.

I wanted to have two changing lights, but was to lazy to build the circuit twice. So I put two leds with different color in series for each channel. This results in two rgb lights changing color with different "phase".

When i have time, i´ll translate that page of mine.

The other "project" - the name is just for fun. Is just the way i light my living room ;-)

DoS

 

ok, i got the idea about the seond project...
il looks quite strange, "alienish"..

 

Hi,

yes it looks strange - but it was meant that way. As you can see there are two light "modes". One uses two compact flouresecent lights to illuminate the ceiling.
The other one uses a "down spot" and in addition to it illuminates those funny red cylinders (done by leds)...

DoS

 

what did you put in the cilinders....?

 

@bogdanfirst:

They are made from red acrylic glass and are illuminated by high efficient red leds.
But this is only looking great if the "main" illumination (via ceiling) is off.

DoS

 

i can imagine. where did you get that from?

 

Those things are sold at IKEA. They are use at the end of the curtain rails as a closing end. That's as well the source for the "Color Balls".

DoS