Current chip favorite ?

la9 · 13th August 2004, 03:44 AM

I've built an lm1875 amp and am very happy with it. I built it on perfboard so I'm thinking of getting a kit and building another one with a printed circuit board. At the same time I'd like something one notch louder.

Is there another chip that is louder but has the same low distortion characteristics ? I'm more interested in very low distortion rates than wattage.

Looking for opinions before I get started.

Thanks

thomas997 · 13th August 2004, 05:56 AM

LM3875 and LM3886 are the favorites.

3886 has a fair bit more power.

I was originally planning on using the 75 but a lot of people are saying theres not much difference in quality, so im switching to the 86.

Couldnt tell a difference in the prototypes I made.

la9 · 13th August 2004, 06:57 AM

I have also been looking at the LM12 but it seems everyone is getting away from that chip, any reasons ? Price ?

gengcard · 13th August 2004, 07:49 AM

For TI, OPA541, OPA548, OPA549.
For National, LM3875 and LM3886.

For me, LM3875 is my favorite because I can make the feedback resistor is so short.

soundNERD · 14th August 2004, 04:52 AM

which ti chip puts out more wattage? the 548 or 549?

about the best chip... the opa549. great bass, low distortion, and decent clarity. The 3875 is second, not the 3886 since its got that stupid mute thing that messes with the sound and needs more parts. I think the 3875 sounds much better.

thomas997 · 14th August 2004, 04:55 AM

Quote:

Originally posted by soundNERD
which ti chip puts out more wattage? the 548 or 549?

about the best chip... the opa549. great bass, low distortion, and decent clarity. The 3875 is second, not the 3886 since its got that stupid mute thing that messes with the sound and needs more parts. I think the 3875 sounds much better.

Do you know why the OPA549 costs so much more than nationals chips?

Yeah that mute thing looks annoying..

thx

soundNERD · 14th August 2004, 05:03 AM

probably since they can push more current, therfore lower impedence, and higher power (nearly 80W into 4ohm).

I haven't figured out why th metal can version is SO expensive tho

MWP · 14th August 2004, 07:44 AM

Quote:

Originally posted by soundNERD
I haven't figured out why th metal can version is SO expensive tho

Probably because its military grade or similar.

matjans · 14th August 2004, 12:40 PM

so far i've only used lm3875's in my stereo amps. After hearing an opa549 based amp by a friend of mine i'm going to build one based on the texas chip.

It has lots more control in the lower regions. And it seems to go a little deeper. Somewhat less clear but on the other hand, my lm3875 tends to be a little sharp.

pinkmouse · 14th August 2004, 01:59 PM

My favorite is still the 549, after two years or so of mucking around with chip amps. However, I do have a regulated LM4780 implementation nearly ready for testing, so maybe that will change my opinion, who knows!

13th August 2004, 03:44 AM	#1
la9 diyAudio Member Join Date: Aug 2004 Location: ?	Current chip favorite ? I've built an lm1875 amp and am very happy with it. I built it on perfboard so I'm thinking of getting a kit and building another one with a printed circuit board. At the same time I'd like something one notch louder. Is there another chip that is louder but has the same low distortion characteristics ? I'm more interested in very low distortion rates than wattage. Looking for opinions before I get started. Thanks

14th August 2004, 01:59 PM	#10
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	My favorite is still the 549, after two years or so of mucking around with chip amps. However, I do have a regulated LM4780 implementation nearly ready for testing, so maybe that will change my opinion, who knows! __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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13th August 2004, 05:56 AM	#2
thomas997 diyAudio Member Join Date: Feb 2004 Location: Vancouver	LM3875 and LM3886 are the favorites. 3886 has a fair bit more power. I was originally planning on using the 75 but a lot of people are saying theres not much difference in quality, so im switching to the 86. Couldnt tell a difference in the prototypes I made.

13th August 2004, 06:57 AM	#3
la9 diyAudio Member Join Date: Aug 2004 Location: ?	I have also been looking at the LM12 but it seems everyone is getting away from that chip, any reasons ? Price ?

13th August 2004, 07:49 AM	#4
gengcard diyAudio Member Join Date: Jun 2004 Location: Bangkok	For TI, OPA541, OPA548, OPA549. For National, LM3875 and LM3886. For me, LM3875 is my favorite because I can make the feedback resistor is so short.

14th August 2004, 04:52 AM	#5
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	which ti chip puts out more wattage? the 548 or 549? about the best chip... the opa549. great bass, low distortion, and decent clarity. The 3875 is second, not the 3886 since its got that stupid mute thing that messes with the sound and needs more parts. I think the 3875 sounds much better.

14th August 2004, 05:03 AM	#7
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	probably since they can push more current, therfore lower impedence, and higher power (nearly 80W into 4ohm). I haven't figured out why th metal can version is SO expensive tho

14th August 2004, 12:40 PM	#9
matjans diyAudio Member Join Date: Aug 2003 Location: Utrecht, NL	so far i've only used lm3875's in my stereo amps. After hearing an opa549 based amp by a friend of mine i'm going to build one based on the texas chip. It has lots more control in the lower regions. And it seems to go a little deeper. Somewhat less clear but on the other hand, my lm3875 tends to be a little sharp.

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