blue led off on 1 ucd180. the folks at

snkby · 28th March 2006, 03:52 AM

diycable.com told me this was a known issue and not to worry about whether it is on or off.

what gives ?

thanks.

classd4sure · 28th March 2006, 04:06 AM

Hm, sssstrange, and the module still works? My best guess at this point would be in may be in backwards. If it's a known issue as they say I'm surprised they didn't give you the obvious simple fix.

snkby · 28th March 2006, 05:05 AM

days now and just tonight the blue led on 1 module went out.

its on my right channel and compared to the left i can hear no difference.

i was also surprised when they told me it was a known issue and not to worry about it.

going to build another psu tomorrow.

going from current (lolool) 154va to 670va with 27kuf per rail.

hope it helps with them cutting out on the big transients.

eventually want to get my hands on a 1kva+ xformer with 33v secondaries or single 60v secondary.

do you know if pwm amps are like chip-amps(lm1875/3886/3875/etc) wrt soar ?

classd4sure · 28th March 2006, 05:21 AM

Did you not try the shorter wires first? I think both would help, and that you'd get more benefit from using shorter wires by far than you ever could from remote supply. Unless it's some crucial objective to be met in your particular case, at least consider trying it.

No point in further guessing what the problem with the LED might be, I'm sure the fix won't be much though, hopefully since it's a known problem and I trust a very minor one they'll let us in on the fix for it.

At any rate I don't believe it's a part of the signal path and would not influence the audio, so I'm sure you have not dreamt not hearing a difference.

snkby · 28th March 2006, 07:09 AM

cable but it will still be about 1m.

all my equipment power supplies are outboard and mechanically isolated except for the new(to me) cdp which is yba product.

cdp and dac are also isolated from analog by using 2 separate conditioners from welbourne labs.

hmmmm......................

which now makes me wonder about powering the ucd amps from the digital vs analog conditioner.

i will post tomorrow what i hear with the new psu.

thanks.

clucka · 28th March 2006, 04:58 PM

Interesting, I was just going to send an email to Hypex regarding the blue LED's. They turn on when the amp is turned on. Built my first stereo amp and now after several days, one is dimmer but there is no difference in sound. What is the purpose of these LED's? I thought maybe they would go out or change color when in standby, but apparently it is not.

Does anyone have any ideas?

Thanks

ped · 28th March 2006, 07:52 PM

On my UcD 180's the blue leds turn off when in standby mode.

snkby · 28th March 2006, 08:52 PM

into standby mode ?

is that just no signal present ?

classd4sure · 28th March 2006, 09:51 PM

Standby means disabled in this case. It's active low just like the /enable line. The LED is just an indicator of the amp being in the enabled state. Far as I know it serves no biasing function or anything at all.

What versions do you guys have?

snkby · 28th March 2006, 10:12 PM

the paperwork and i cant see 1 on either of the modules because they are attached to a heatsink and not easy to move around.

28th March 2006, 03:52 AM	#1
snkby diyAudio Member Join Date: Jun 2005 Location: northern california	blue led off on 1 ucd180. the folks at diycable.com told me this was a known issue and not to worry about whether it is on or off. what gives ? thanks.

28th March 2006, 05:05 AM	#3
snkby diyAudio Member Join Date: Jun 2005 Location: northern california	both blue leds have been on for days now and just tonight the blue led on 1 module went out. its on my right channel and compared to the left i can hear no difference. i was also surprised when they told me it was a known issue and not to worry about it. going to build another psu tomorrow. going from current (lolool) 154va to 670va with 27kuf per rail. hope it helps with them cutting out on the big transients. eventually want to get my hands on a 1kva+ xformer with 33v secondaries or single 60v secondary. do you know if pwm amps are like chip-amps(lm1875/3886/3875/etc) wrt soar ?

28th March 2006, 07:09 AM	#5
snkby diyAudio Member Join Date: Jun 2005 Location: northern california	will definitely use shorter power cable but it will still be about 1m. all my equipment power supplies are outboard and mechanically isolated except for the new(to me) cdp which is yba product. cdp and dac are also isolated from analog by using 2 separate conditioners from welbourne labs. hmmmm...................... which now makes me wonder about powering the ucd amps from the digital vs analog conditioner. i will post tomorrow what i hear with the new psu. thanks.

28th March 2006, 08:52 PM	#8
snkby diyAudio Member Join Date: Jun 2005 Location: northern california	how do you put yours into standby mode ? is that just no signal present ?

28th March 2006, 10:12 PM	#10
snkby diyAudio Member Join Date: Jun 2005 Location: northern california	i dont have a version# on the paperwork and i cant see 1 on either of the modules because they are attached to a heatsink and not easy to move around. __________________ if it aint broke.........tweak it !!


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28th March 2006, 04:06 AM	#2
classd4sure Account Disabled Join Date: Feb 2004	Hm, sssstrange, and the module still works? My best guess at this point would be in may be in backwards. If it's a known issue as they say I'm surprised they didn't give you the obvious simple fix.

28th March 2006, 05:21 AM	#4
classd4sure Account Disabled Join Date: Feb 2004	Did you not try the shorter wires first? I think both would help, and that you'd get more benefit from using shorter wires by far than you ever could from remote supply. Unless it's some crucial objective to be met in your particular case, at least consider trying it. No point in further guessing what the problem with the LED might be, I'm sure the fix won't be much though, hopefully since it's a known problem and I trust a very minor one they'll let us in on the fix for it. At any rate I don't believe it's a part of the signal path and would not influence the audio, so I'm sure you have not dreamt not hearing a difference.

28th March 2006, 04:58 PM	#6
clucka diyAudio Member Join Date: Feb 2006 Location: Chicago	Interesting, I was just going to send an email to Hypex regarding the blue LED's. They turn on when the amp is turned on. Built my first stereo amp and now after several days, one is dimmer but there is no difference in sound. What is the purpose of these LED's? I thought maybe they would go out or change color when in standby, but apparently it is not. Does anyone have any ideas? Thanks

28th March 2006, 07:52 PM	#7
ped diyAudio Member Join Date: Apr 2003 Location: PA	On my UcD 180's the blue leds turn off when in standby mode.

28th March 2006, 09:51 PM	#9
classd4sure Account Disabled Join Date: Feb 2004	Standby means disabled in this case. It's active low just like the /enable line. The LED is just an indicator of the amp being in the enabled state. Far as I know it serves no biasing function or anything at all. What versions do you guys have?

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