Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: fromnowon on December 19, 2018, 03:26:24 PM

Title: HLMP-6000 LEDs
Post by: fromnowon on December 19, 2018, 03:26:24 PM

I was thinking about ordering some spare LEDs, to have on hand in, just "in case".

Soldering this small LED to the 9-pin socket was probably the most challenging part of the Crack build, IMO.  I'm happy with how mine came out, and it works great, but having a spare around seems like a good idea. 

I'm curious about the note on the parts page:
"Store unused LEDs in a dry environment and install within one year of purchase."

Why do they need to be installed within a year - do they only have a shelf life of one year?
Is this a part that could wear out over time?  Does installing it somehow extend its life?  Is replacing the LED on my 9-pin socket every year preventive maintenance?

Just wondering! Thanks.

Title: Re: HLMP-6000 LEDs
Post by: Karl5150 on December 20, 2018, 03:51:56 AM

I believe it has to do with moisture absorption. If they have absorbed too much moisture there is a baking/drying protocol before use. Once installed, the heat from the amp should keep them dry, plus they won't be subjected to 600 plus degrees as in installation.

Title: Re: HLMP-6000 LEDs
Post by: mcandmar on December 20, 2018, 10:57:44 AM

As far as i know the only concern is oxidation on the leads, i.e. with high moisture they can oxidize and possibly lead to issues soldering.  If you order from Mouser they come in a sealed anti static bag with a silica bag inside, its all a bit belt and braces, they will be fine.

Title: Re: HLMP-6000 LEDs
Post by: Paul Birkeland on December 20, 2018, 01:13:39 PM

They do absorb moisture over time and if you solder one that is saturated with moisture, it will break (electrically). 

Here is the pertinent information:
https://docs.broadcom.com/docs/AV02-1298EN (https://docs.broadcom.com/docs/AV02-1298EN)

Technically all HLMP diodes are considered surface mount devices, we are just lucky that they make some with leads.

Title: Re: HLMP-6000 LEDs
Post by: fromnowon on December 21, 2018, 11:19:20 AM

Thanks!

I guess if I were ever going to store my crack, it would make sense to use a desiccant and some kind of bag for the amp to protect these moisture-sensitive parts.  That's good to know. 

Title: Re: HLMP-6000 LEDs
Post by: Paul Birkeland on December 22, 2018, 07:03:58 AM

Quote from: fromnowon on December 21, 2018, 11:19:20 AM

Thanks!

I guess if I were ever going to store my crack, it would make sense to use a desiccant and some kind of bag for the amp to protect these moisture-sensitive parts.  That's good to know.

No, that's absolutely ridiculous. 

If you're going to store a bunch of LEDs to solder into something later, they should be moisture protected.  Once they are installed, there's no issue. 

Title: Re: HLMP-6000 LEDs
Post by: fromnowon on December 24, 2018, 09:34:53 AM

Thanks, I'm glad it's not necessary.

ridiculous though, may be a poor choice of words ... The adjective ridiculous comes from the Latin word ridere, which means “to laugh,” but it's also related to the word ridicule, which means to mock in a cruel way. A mocking and cruel laughter, that's a common reaction to ridiculous situations.

I absolutely hope everyone at Bottlehead has a great Christmas.  I seriously appreciate this forum and the support you provide to all of us. 

Title: Re: HLMP-6000 LEDs
Post by: Paul Birkeland on December 24, 2018, 10:33:17 AM

From Merriam Webster:

"ridiculous adjective
ri·​dic·​u·​lous | \rÉ™-ˈdi-kyÉ™-lÉ™s  \
Definition of ridiculous
: arousing or deserving ridicule : extremely silly or unreasonable : ABSURD, PREPOSTEROUS"

Title: Re: HLMP-6000 LEDs
Post by: Natural Sound on December 24, 2018, 02:42:55 PM

Glad I live in the desert.  ;)