stupid question/ how to use a led on a doepfer bus ?

[citric acid]

Hi,

i have a stupid question , i wan´t to use an led behind a passive module to iluminate it from behind ( in this case a multiple/ patch matrix ).

How can i put a led directly on the doepfer bus.

Ok i know that i need in minimum a resistor ..do i have to go on the 5v line of the doepfer buss ?

thanks

[Tim Servo]

Hi Citric,

I think you won't get very many replies to your question in the "Layout Factory" sub-forum, as this is meant as a place for posting PCB layouts. Try posting to the main "DIY Hardware and Software" area instead and I bet you'll get much more help for general DIY questions like this.

Cheers,

Tim (spends a lot of time in the DIY area) Servo

[vladosh]

Here is some led driver ideas on the MFOS site but these are for different purpose i guess ..
http://www.musicfromouterspace.com/analogsynth_new/HOT_TIPS/PDF/led_driver_ideas_assembly.pdf

[Blue Hell]

[Blue Hell]

A resistor, yes .. and Ohms law, and an idea about how much current you want to run through the LED and the voltage you want to connect the thing to, doesnt matter really on what bus ... in reversed order :

5V

2mA

The LED itself needs about 2V, which Leaves 3V for the resistor.

V = I × R or R = V ÷ I or R = 3 ÷ 0.002 which yields 1k5.

When you choose another voltage just recalculate with this and when the LED is too dim to your taste lower the resistor, when its too bright use a larger one.

[diablojoy]

backlit panels always look cool
be interesting to see how you are planning to implement this.

[citric acid]

thanks for the replays... i found 2 brackground lights from pc case mod.

i Think this is better than use power from the bus.. i will make some pics later.

thanks..