Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

how to dim an LED
how to dim an LED
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st July 2011, 11:57 PM   #1
jimbo1968 is offline jimbo1968  United Kingdom
diyAudio Member
 
Join Date: Nov 2004
Location: UK, bristol
Default how to dim an LED

sorry for off-topic, but I know someone here will know the answer.

I just bought a cambridge audio P500 amplifier, the single green LED is way too bright.

What size resistor should I put in series to dim it?
'Really dim' is what I'm aiming for.

If you need to know the voltage I will measure it.

thanks
  Reply With Quote
Old 21st July 2011, 11:59 PM   #2
Andrew Eckhardt is offline Andrew Eckhardt  United States
diyAudio Member
 
Join Date: Nov 2005
Nobody knows what really dim is going to take, but you'd be off to a decent start by finding the value of whatever dropping resistor is currently in series with it and replacing it with 4 or 5 times the resistance.

If you need it dimmer add more resistance.

Last edited by Andrew Eckhardt; 22nd July 2011 at 12:03 AM.
  Reply With Quote
Old 22nd July 2011, 12:11 AM   #3
jimbo1968 is offline jimbo1968  United Kingdom
diyAudio Member
 
Join Date: Nov 2004
Location: UK, bristol
Thanks,

I haven't opened it yet, but from this picture it looks like an easy job. even for a mechanical engineer.

Someone will probably tell me the resistor value before I can measure it
Attached Images
File Type: jpg pic_0203.jpg (153.8 KB, 117 views)
  Reply With Quote
Old 22nd July 2011, 12:15 AM   #4
danFrank is offline danFrank  United States
diyAudio Member
 
Join Date: May 2005
Location: California
how to dim an LED
Brown, Black, red? 1K ohms. Just put a small 5K or 10K trimmer in series with the resistor, adjust till you get the desired brightness and then forget about it.
Daniel
  Reply With Quote
Old 22nd July 2011, 12:19 AM   #5
jimbo1968 is offline jimbo1968  United Kingdom
diyAudio Member
 
Join Date: Nov 2004
Location: UK, bristol
Good idea. I can probably find one of those.
  Reply With Quote

Reply


how to dim an LEDHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
NAD Display Very Dim DQ828 Digital Source 28 2nd July 2014 09:19 AM
Very dim digital readout srinath Solid State 13 3rd April 2011 08:02 AM


New To Site? Need Help?

All times are GMT. The time now is 09:35 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki