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Need Part# or Spec for LED's
Posted: Tue Oct 12, 2010 1:05 pm
by dvnt88
Need to replace the LED's in 1 of my TI 500.4's and can't find the info. I had laying around for the part# thru Digikey and the specs on the little suckers
. Any info would help and will apologize ahead of time
as I know this has been posted before, just don't have time to search as I'm at work
.
Posted: Tue Oct 12, 2010 2:41 pm
by ttocs
I was told one time that they like to use a 4.2v resistor, not sure if this is that case to be sure though....
Posted: Tue Oct 12, 2010 8:14 pm
by Thumper88
ttocs wrote:I was told one time that they like to use a 4.2v resistor, not sure if this is that case to be sure though....
What?
Posted: Tue Oct 12, 2010 9:54 pm
by valeks1
Posted: Tue Oct 12, 2010 10:11 pm
by Jacampb2
*Edit* What He said ^ answered while I was getting my long winded reply together...
Yeah, not sure what scott is getting at, but, most blue leds have a forward voltage of 3.2-3.8 Vdc. The truth of the matter is, just about any off the shelf 3mm blue led will likely work, unless you find something with a very unusual forward voltage. The biggest issue will actually be color match if you have other Ti amps. You may be wise to just replace the LEDs in all of them so that they match.
I have replaced the LED's in several Ti amps with just common run of the mill 3.4Vdc 3mm blue leds. The LED boards in the TI amps have a current limiting resistor(s) that will keep the brightness pretty uniform with a led swap.
If you want to know for sure what the old LEDs forward voltage is, you have to have a TI amp with working LEDs, power it up and measure the voltage across the LED, meaning, the red meter lead on the LEDs positive side and the black lead on the negative side, multimeter set to measure DC volts. The number displayed is your forward voltage. Alternatively, you can measure the voltage of the supply to the LED board, measure the voltage across the current limiting resistor and subtract the current limit from the supply voltage. If the LED's are all in parallel (two versions of the board) then the number you got is the forward voltage, if the LED's are all in series, then divide by three and you should have your forward voltage.
Good Luck,
Jason
Posted: Wed Oct 13, 2010 5:22 am
by dvnt88
Jacampb2 wrote:*Edit* What He said ^ answered while I was getting my long winded reply together...
Yeah, not sure what scott is getting at, but, most blue leds have a forward voltage of 3.2-3.8 Vdc. The truth of the matter is, just about any off the shelf 3mm blue led will likely work, unless you find something with a very unusual forward voltage. The biggest issue will actually be color match if you have other Ti amps. You may be wise to just replace the LEDs in all of them so that they match.
I have replaced the LED's in several Ti amps with just common run of the mill 3.4Vdc 3mm blue leds. The LED boards in the TI amps have a current limiting resistor(s) that will keep the brightness pretty uniform with a led swap.
If you want to know for sure what the old LEDs forward voltage is, you have to have a TI amp with working LEDs, power it up and measure the voltage across the LED, meaning, the red meter lead on the LEDs positive side and the black lead on the negative side, multimeter set to measure DC volts. The number displayed is your forward voltage. Alternatively, you can measure the voltage of the supply to the LED board, measure the voltage across the current limiting resistor and subtract the current limit from the supply voltage. If the LED's are all in parallel (two versions of the board) then the number you got is the forward voltage, if the LED's are all in series, then divide by three and you should have your forward voltage.
Good Luck,
Jason
Jason - Thanx for the heads up
and have already got the info. needed and will look at the 1200.1 I have and test the LED's.
Posted: Wed Oct 13, 2010 5:27 am
by dvnt88
Thanx much
...got a bid put in for these and will end up swapping out the LED's also in my 1200.1 so they both match
. Might as well do my ZX475 while I'm in a soldering mood.
Did you ever sell the Xenon 200.4?
I see ya have some of the isolators up on the bay, would you be open to me picking up 2 or 3 sets in person instead of shipping since we're in the same local?
Posted: Wed Oct 13, 2010 9:37 am
by valeks1
I still have about 10 -15 Xenon X200.4. I didn't selling on eBay now because I just don't have time to rework and upgrade. Yes you can pick up insulators, I think you know the address if not check
www.altser.com.
If LED too bright try adjust resistor.
Posted: Wed Oct 13, 2010 12:33 pm
by dvnt88
valeks1 wrote:I still have about 10 -15 Xenon X200.4. I didn't selling on eBay now because I just don't have time to rework and upgrade. Yes you can pick up insulators, I think you know the address if not check
www.altser.com.
If LED too bright try adjust resistor.
What day and time works for you?
I have tomorrow off as I work Fri-Mon or can schedule a time with you next week?
10-15 X200.4's
Gotta take a look at those when we meet up and maybe take 1 of 'em off your hands.