UL-01AN what the heck is it?

banana · 31st May 2007, 05:28 PM

Just opened a DAC from a friend of mind and found this, UL-01AN.
This should be a single opamp, but there seems to be no information about it on the internet. Not from search here, google or alldatasheet.com...

Anyone have information on it, please help

peranders · 2nd June 2007, 09:06 PM

Interesting, never seen this logo before.

CJ900RR · 3rd June 2007, 10:13 AM

What is the manufator name of the dac? My guess is that its either a circut made by, or on order by, the manufactor, or that its just a standard op-amp with a new print on to make it harder to copy the design.

And i think that the seccond option is the most likely one.

banana · 3rd June 2007, 01:39 PM

It's Assemblage DAC2.6 bought from second hand market. I have the schematic, the original opamp should be OPA604.

The previous owner have changed the I/V opamp into OPA627, and the LPF opamp into this unknown creature... I guess it won't be cheap, considered he can afford OPA627

badgerboy · 3rd June 2007, 02:16 PM

My guess is possibly a BUF-01 precision buffer/voltage follower, from the BUF-01/02/03/04 family that were designed for high-end audio applications. UL prefix - ???

arthur · 3rd June 2007, 02:51 PM

it is an average single op amp ,remaked by hk diy shop that wholesale holco resister yrs ago in hk

djQUAN · 3rd June 2007, 03:32 PM

from what I have seen before, remarked IC's and transistors have the labels printed on using easily removable ink.

try rubbing a cotton bud with some acetone or lacquer thinner on it and if the markings come off, then it is a remarked chip.

2nd June 2007, 09:06 PM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Interesting, never seen this logo before. __________________ /Per-Anders (my first name) or P-A as my friends call me

3rd June 2007, 02:16 PM	#5
badgerboy diyAudio Member Join Date: Mar 2004 Location: Kingston upon Hull, UK	My guess is possibly a BUF-01 precision buffer/voltage follower, from the BUF-01/02/03/04 family that were designed for high-end audio applications. UL prefix - ??? __________________ Overlord of the stuffed attic.

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3rd June 2007, 10:13 AM	#3
CJ900RR diyAudio Member Join Date: Jan 2006	What is the manufator name of the dac? My guess is that its either a circut made by, or on order by, the manufactor, or that its just a standard op-amp with a new print on to make it harder to copy the design. And i think that the seccond option is the most likely one.

3rd June 2007, 01:39 PM	#4
banana diyAudio Member Join Date: Feb 2003 Location: Hong Kong	It's Assemblage DAC2.6 bought from second hand market. I have the schematic, the original opamp should be OPA604. The previous owner have changed the I/V opamp into OPA627, and the LPF opamp into this unknown creature... I guess it won't be cheap, considered he can afford OPA627

3rd June 2007, 02:51 PM	#6
arthur diyAudio Member Join Date: Oct 2001 Location: .	it is an average single op amp ,remaked by hk diy shop that wholesale holco resister yrs ago in hk

3rd June 2007, 03:32 PM	#7
djQUAN diyAudio Member Join Date: May 2004 Location: manila	from what I have seen before, remarked IC's and transistors have the labels printed on using easily removable ink. try rubbing a cotton bud with some acetone or lacquer thinner on it and if the markings come off, then it is a remarked chip.

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