Disappearing opamp alert!
Mar 22, 2006 at 1:38 AM Thread Starter Post #1 of 16

funch

Headphoneus Supremus
Joined
Jan 14, 2004
Posts
2,040
Likes
228
Location
Au Canyon
It seems as Digikey is going to stop selling some of our more popular opamps individually. Once current supplies are gone, we'll have to buy them in quantity. They are: AD845 and the AD8065/66. The AD843's are already gone. So far the 132/134, 227/627/637, and 823 are safe, but for how long? Sorry if this has been posted before, but as I'm starting to configure a PPA v2, I am just noticing it.
 
Mar 22, 2006 at 2:37 AM Post #3 of 16

ericj

Headphoneus Supremus
Joined
Aug 2, 2005
Posts
8,262
Likes
142
Possibly the non-ROHS versions are disappearing? The compliant versions of the AD chips have a different suffix, iirc.
 
Mar 22, 2006 at 3:32 AM Post #6 of 16

Nerull

100+ Head-Fier
Joined
Jun 14, 2005
Posts
344
Likes
10
I just ordered some of those lovely AD8065's
smily_headphones1.gif

From Digikey, that is.
I understand your opamp problem, as I was in the same boat.
~Tom
 
Mar 22, 2006 at 3:42 AM Post #7 of 16

rickcr42

Are YOU talkin' to me?
Joined
Jun 21, 2001
Posts
13,874
Likes
14
Quote:

Possibly the non-ROHS versions are disappearing? The compliant versions of the AD chips have a different suffix, iirc.


As the RoHs compliant parts fill the voids in available stock those parts will forever be off my personal "for audio use" list.Not buying in to the sham and will not use inferior parts.Period
I would rather pay extra for NOS if I must (or shoot straight to Mil-Spec
wink.gif
) and when mosfets,jfets,transistors,caps,resistors begin to gradually also be replaced same thing.Leaded or they can stick it
mad.gif
 
Mar 22, 2006 at 4:49 AM Post #9 of 16

tyre

100+ Head-Fier
Joined
Oct 9, 2004
Posts
483
Likes
16
Quote:

Originally Posted by rickcr42
and when mosfets,jfets,transistors,caps,resistors begin to gradually also be replaced same thing.Leaded or they can stick it
mad.gif



I'm not really familiar with the manufacturing processes of opamps and transistors, but how much of the internals are actually composed of lead (versus silicon and other metals)?
 
Mar 22, 2006 at 4:54 AM Post #10 of 16

rickcr42

Are YOU talkin' to me?
Joined
Jun 21, 2001
Posts
13,874
Likes
14
Quote:

I'm not really familiar with the manufacturing processes of opamps and transistors, but how much of the internals are actually composed of lead (versus silicon and other metals)?


Lead free is all about the bonding process being questionable to say the least and with the combination of increased soldering temp,iffy joints and heat sensitive parts nearby not a pretty picture.

there is a boatload of content right here at headfi on this but for an example of our own first casualty in the "lead wars" read this page.Not pretty man :

http://www6.head-fi.org/forums/showt...=166960&page=9

begin at post #171
 
Mar 22, 2006 at 5:41 AM Post #12 of 16

tyre

100+ Head-Fier
Joined
Oct 9, 2004
Posts
483
Likes
16
Quote:

Originally Posted by rickcr42
begin at post #171


Ugh, I guess I should probably hang on to whatever opamps I have, considering that they might become scarce sometime in the near future.
 
Mar 22, 2006 at 4:11 PM Post #13 of 16

Ikon

100+ Head-Fier
Joined
Nov 21, 2004
Posts
269
Likes
11
I use quite a lot of the popular Intersil HA-5002 buffers in my amps. I never noticed any difference when soldering, I even had to re-check the packaging because I wasn't sure, but it turns out they are the lead-free version.
Mind you that I use standard 60/40 solder and a cheapo soldering iron.
Hell, some of these chips are even the SO-8 (SMD) version and I didn't notice the slightest difference.

I haven't tried lead-free solder yet (simply because it can be quite expensive), but the leaded solder + lead-free parts combo worked just fine for me.
In fact I am very happy to have a little less heavy metal around me.
 
Mar 22, 2006 at 4:15 PM Post #14 of 16

rickcr42

Are YOU talkin' to me?
Joined
Jun 21, 2001
Posts
13,874
Likes
14
Quote:

In fact I am very happy to have a little less heavy metal around me.


bookmark this thread and in two years when the close to organic solder joint melts away at the microscopic level leaving cavities behind tell me how you feel then.

Less metal ?

How about orders of magnetude more metal as the diposable/built in lifespan products begin to pile up in the landfills to be replaced with more junk every two years.

RoHs is a sham based on bad science
 
Mar 23, 2006 at 1:20 AM Post #15 of 16

Nerull

100+ Head-Fier
Joined
Jun 14, 2005
Posts
344
Likes
10
That's very interesting Rick. Do you have anymore details or information on this, because this sounds like a good thing to investigate for something at school.

~Tom
 

Users who are viewing this thread

Top