how do I install an LED

jdbrocious · 29th February 2008, 12:33 AM

I am putting some finishing touches on my amp build, and I want to put an LED on the front panel when it is powered on. How do I wire it into the switch? I've never messed with one, so is it just inline with the power? or do they need resistance?

thanks

Original Burnedfingers · 29th February 2008, 12:39 AM

http://www.iguanalabs.com/1stled.htm

jdbrocious · 29th February 2008, 12:49 AM

that definately helps, but im still not sure how to do it with a switch.

I am not using a bread board for this part, this will be point to point wiring.

sorry for my ignorance.

from what i gather, a 2.2k resistor wired in line from the power will have the LED on all the time. Now how do I get it to come on and off with the switch.

thanks for the help

dark_avenger · 29th February 2008, 01:06 AM

put the led after the switch instead of b4

jdbrocious · 29th February 2008, 01:36 AM

does it still need a resistor?

despotic931 · 29th February 2008, 02:07 AM

yep

AndrewT · 1st March 2008, 10:38 AM

Hi,
you can wire the LED + resistor across the main smoothing caps.
As the caps charge up the LED lights and then brightens, no switch needed.
At switch off the LED will dim and eventually go out.
This LED current also discharges the smoothing caps (down to about 1.6V) after switch off.

Original Burnedfingers · 1st March 2008, 11:18 AM

Quote:

you can wire the LED + resistor across the main smoothing caps.

Do you need help in figuring the size of the resistor? What is your power supply voltage?

29th February 2008, 12:33 AM	#1
jdbrocious diyAudio Member Join Date: Mar 2005 Location: PA	how do I install an LED I am putting some finishing touches on my amp build, and I want to put an LED on the front panel when it is powered on. How do I wire it into the switch? I've never messed with one, so is it just inline with the power? or do they need resistance? thanks

1st March 2008, 10:38 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, you can wire the LED + resistor across the main smoothing caps. As the caps charge up the LED lights and then brightens, no switch needed. At switch off the LED will dim and eventually go out. This LED current also discharges the smoothing caps (down to about 1.6V) after switch off. __________________ regards Andrew T.

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29th February 2008, 12:39 AM	#2
Original Burnedfingers diyAudio Member Join Date: Nov 2002	http://www.iguanalabs.com/1stled.htm

29th February 2008, 12:49 AM	#3
jdbrocious diyAudio Member Join Date: Mar 2005 Location: PA	that definately helps, but im still not sure how to do it with a switch. I am not using a bread board for this part, this will be point to point wiring. sorry for my ignorance. from what i gather, a 2.2k resistor wired in line from the power will have the LED on all the time. Now how do I get it to come on and off with the switch. thanks for the help

29th February 2008, 01:06 AM	#4
dark_avenger diyAudio Member Join Date: Sep 2007	put the led after the switch instead of b4

29th February 2008, 01:36 AM	#5
jdbrocious diyAudio Member Join Date: Mar 2005 Location: PA	does it still need a resistor?

29th February 2008, 02:07 AM	#6
despotic931 diyAudio Member Join Date: Jan 2008	yep

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