PC Light Bus

[kd7jur]

Ok so here's my delema...

A few years ago i found a really nice lighting kit (clicky) but never had a reason or the funds to buy it... Now i do the only problem is it is no longer available...

So my idea is to build something that works like this controlling the LED's w/ rheostats. I just cannot find a circuit design to control an LED w/ a rheostat.

the only circuit i've found says 330ohm resistor and an led off of 6V.

The circuit i want to build Will have 4 Tri color LED's (R/G/B) each color controlled by a seperate Channel (by 3 rheostats). This is all powered by a 12V from a PC power supply

Can anybody give me any help with this. I will actually get a chance to test this friday when i go to class and have the test equiptment and my instructor to possibly help me, but i'de like to go in with an idea...

Thanks for any and all help

 

[duffy]

It's that same as the other circuit, you just replace the resistor with a rheostat. Actually, you still want to have that fixed resistor in series with the rheostat, so that if you turn the resistance down to zero it won't ruin the LED. Use a 360 ohm resistor as the fixed resistor, that will limit the max brightness to less than 30ma off the 12V supply. Use like a 1k or 10k rheostat, the best value depends on the led and how you have them set up.

 

[kd7jur]

Ok so i know this is bumping back to the top but i really need some advice (didn't get anything outa my instructor). The concept is to build my own **broken link removed** so any advice would be really appriciated. Also i think i found the LED's i want to use HERE.

So a quick Reference on what i want to be able to do...
-Powered by 12V from PC Power Supply
-Individually Control Each Color Channel (R/G/B) by Pots
-Maybe add support for other features
-Hook up to HDD light on MoBo for when HDD thinks the lights Flash
-Any other ideas?

I need a rough idea of how to design
-is it series or parrallel
-how do i figure what resistors i need

Again thank you for any help provided.