LED power on light? - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > Tubelab

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 6th March 2010, 09:16 PM   #1
newtube is offline newtube  United Kingdom
diyAudio Member
 
Join Date: Mar 2009
Default LED power on light?

Hi guys, i built a simple se amp last year and i'm very happy with the whole thing. . .
However, i fitted a yellow led light into the front panel as a power on indicator but never got round to wiring it in, my question is how?

What do i wire the two leads to and is there a resistor needed etc?

Thanks.
  Reply With Quote
Old 6th March 2010, 11:24 PM   #2
rknize is offline rknize  United States
diyAudio Member
 
rknize's Avatar
 
Join Date: Feb 2009
Location: Chicagoland
Send a message via AIM to rknize Send a message via Yahoo to rknize
All depends what you want to wire it to. If it is a typical yellow LED, figure 2.2V @ 20mA or so. You can wire it to a 6.3VAC heater wiring using a 220 ohm resistor. It will flicker at 60Hz. If that bothers you, you'll need a low voltage DC supply of some kind.
  Reply With Quote
Old 7th March 2010, 12:48 AM   #3
diyAudio Member
 
Join Date: Nov 2009
Location: Wichita, KS USA
If you can't tap from a DC point in the circuit and don't want the flicker use a full-wave bridge and a cap...(don't forget the led series resistor as well)... or, you could use a resistor and a dual color led (say red and green) wired in anti-parallel. It'll glow "yellow" on AC...

If you want to run off the line voltage (120VAC) use a 0.47uF, 200V cap in one leg of the AC line. Put a 1K resistor in the other AC leg. Use a 1N4004 (or such) diode wired in anti-parallel with the led. Put one leg of the AC on one side of the diode pair and the other AC leg on the other side of the diode. Still going to "flash" at 60 Hz (though you'll only see the flash if you wave your fingers in front of it or shake your head around while staring at it)...
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
turned on Aleph 1.2,but LED doesn't Light up Steve Fay Pass Labs 13 27th November 2004 11:37 AM
LED light on car amp but no power up tristen Car Audio 4 22nd February 2004 05:09 PM


New To Site? Need Help?

All times are GMT. The time now is 02:49 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2