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 Forum index » DIY Hardware and Software
stupid question/ how to use a led on a doepfer bus ?
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citric acid



Joined: Jun 11, 2011
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Location: germany

PostPosted: Thu Sep 29, 2011 11:05 am    Post subject: stupid question/ how to use a led on a doepfer bus ? Reply with quote  Mark this post and the followings unread

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

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Tim Servo



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PostPosted: Wed Oct 05, 2011 2:57 pm    Post subject: stupid question/ how to use a led on a doepfer bus ? Reply with quote  Mark this post and the followings unread

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
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vladosh



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PostPosted: Thu Oct 06, 2011 12:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

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
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Blue Hell
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PostPosted: Thu Oct 06, 2011 12:28 pm    Post subject: Re: stupid question/ how to use a led on a doepfer bus ? Reply with quote  Mark this post and the followings unread

Tim Servo wrote:
Try posting to the main "DIY Hardware and Software" area instead[...]


Let's move it then Wink

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Blue Hell
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PostPosted: Thu Oct 06, 2011 12:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

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.

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diablojoy



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PostPosted: Thu Oct 06, 2011 3:17 pm    Post subject: Reply with quote  Mark this post and the followings unread

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

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citric acid



Joined: Jun 11, 2011
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PostPosted: Fri Oct 07, 2011 8:46 am    Post subject: Reply with quote  Mark this post and the followings unread

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..

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