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Old 28th March 2006, 03:52 AM   #1
snkby is offline snkby  United States
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Default 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.
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Old 28th March 2006, 04:06 AM   #2
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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.
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Old 28th March 2006, 05:05 AM   #3
snkby is offline snkby  United States
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Default 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 ?
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Old 28th March 2006, 05:21 AM   #4
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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.
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Old 28th March 2006, 07:09 AM   #5
snkby is offline snkby  United States
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Default 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.
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Old 28th March 2006, 04:58 PM   #6
clucka is offline clucka  United States
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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
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Old 28th March 2006, 07:52 PM   #7
ped is offline ped  United States
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On my UcD 180's the blue leds turn off when in standby mode.
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Old 28th March 2006, 08:52 PM   #8
snkby is offline snkby  United States
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Default how do you put yours

into standby mode ?

is that just no signal present ?
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Old 28th March 2006, 09:51 PM   #9
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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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Old 28th March 2006, 10:12 PM   #10
snkby is offline snkby  United States
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Default 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.
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