A chip for rock

marginwalker · 30th April 2006, 06:47 PM

Hi everybody!

Here's Marco, a perfect newbie

I'm gonna make my first DIY Audio project and i'd like to know which chip is better for rock & groovy musics (ie electro, hard bop jazz) used with 8ohm 90-95db laudspeakers....

I'd (and i guess you too) like to listen to clear hi, open mid and punchy bass and I need a very fast amp too. To me, the matter is: LM3875 or 3886 (or something else) ?

I looked at Pedja Jfet buffer GC http://www.hificafe.net/diy/images/gc/jfet-reg-igc.pdf
and Mauro Penasa 3886 My "audiophile" LM3886 approach :
i guess they're both a very good approach, but i can't say myself which one would be better for my musical tastes!

Did anyone build these amps and would left a feedback?
Or maybe someone feels happy with another type of GC... please let me know or advise me a well detailed (don't forget i'm a total newbie) schematic

Thanks to you all in advance!

Ciao!

Marco

XELB · 30th April 2006, 10:59 PM

LM3886 with a good PSU and a decent source plus preamp or buffer, sounds very well in Rock, thrash metal and groovy musics(like bossa nova).
If you use a straight LM3886(just with a normal cd player), it will sound very crispy and without life....

LM3886 it's very accourate so, it will evidence all the defects of your source.
You must pay attention to your source if you want a very dynamic amp.

phn · 2nd May 2006, 01:02 AM

Unlike XELB, I cannot speak for the sonic characteristics, though the 3875 has great bottom-end from what I hear.

XELB may very well be right. But for 8 Ohm speakers I would probably go with the 3875. For 4 Ohms, the 3886 is the obvious choice. None of them will have any problem driving 90 db speakers at deafening levels.

Here's schematics for the 3875: RMJ Audio

mateo88 · 2nd May 2006, 03:07 AM

Both the lm3875 and 3886 will sound good as long as you use an active pre. Like XELB said, it will be very lifeless without one.

pwan · 2nd May 2006, 05:30 AM

You may wanna try OPA541 / OPA549 with big cap power supply.

marginwalker · 2nd May 2006, 10:31 AM

many thanks to you all!

This is my first DIY project amd I've realized that building a 'very cool' (snubber large caps, regulated, buffer input) GC would be expansive (at least for me), so i decided to build a very simple IGC -as Nick do on DecibelDungeoun- with good components (Black Gaqe caps, Riken Ohm Res) and use my Harman Kardon HK680 as preamp.

For the power supply i'm gonna use two Skynet 8080 bridged.

What do you think about this choice?

pwan · 2nd May 2006, 02:37 PM

Quote:

Originally posted by marginwalker
many thanks to you all!

This is my first DIY project amd I've realized that building a 'very cool' (snubber large caps, regulated, buffer input) GC would be expansive (at least for me), so i decided to build a very simple IGC -as Nick do on DecibelDungeoun- with good components (Black Gaqe caps, Riken Ohm Res) and use my Harman Kardon HK680 as preamp.

For the power supply i'm gonna use two Skynet 8080 bridged.

What do you think about this choice?

So, if I were you I would go for:

The NI config is better in my system.

Why don't you try using typical metal film 1% first and you can upgrade it later if you want. ( The difference is often unnoticable for some people in some system). In my case, I was using typical components except the input cap ( with typical 4,700x8 + 0.1x2 filter cap) I had saved lot of money for my next bi-amp projects.

phn · 2nd May 2006, 02:47 PM

I second pwan.

The 1000 uF/50 V Rubycon cap costs $3 and is one of the best. A bipolar 4.7 uF BG costs about as much and could be an alternative. At least to more expensive film caps like Auricaps.

The chip, if I'm correct, costs about €10. Don't spend much more than that on the rest of the components. And don't waste money on stupid "audio-grade" connectors and stuff.

The intestines of the Gaincard

30th April 2006, 06:47 PM	#1
marginwalker diyAudio Member Join Date: Apr 2006	A chip for rock Hi everybody! Here's Marco, a perfect newbie I'm gonna make my first DIY Audio project and i'd like to know which chip is better for rock & groovy musics (ie electro, hard bop jazz) used with 8ohm 90-95db laudspeakers.... I'd (and i guess you too) like to listen to clear hi, open mid and punchy bass and I need a very fast amp too. To me, the matter is: LM3875 or 3886 (or something else) ? I looked at Pedja Jfet buffer GC http://www.hificafe.net/diy/images/gc/jfet-reg-igc.pdf and Mauro Penasa 3886 My "audiophile" LM3886 approach : i guess they're both a very good approach, but i can't say myself which one would be better for my musical tastes! Did anyone build these amps and would left a feedback? Or maybe someone feels happy with another type of GC... please let me know or advise me a well detailed (don't forget i'm a total newbie) schematic Thanks to you all in advance! Ciao! Marco

30th April 2006, 10:59 PM	#2
XELB diyAudio Member Join Date: Dec 2004 Location: Lisboa	LM3886 with a good PSU and a decent source plus preamp or buffer, sounds very well in Rock, thrash metal and groovy musics(like bossa nova). If you use a straight LM3886(just with a normal cd player), it will sound very crispy and without life.... LM3886 it's very accourate so, it will evidence all the defects of your source. You must pay attention to your source if you want a very dynamic amp. __________________ If you want power you must add control

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2nd May 2006, 01:02 AM	#3
phn diyAudio Member Join Date: Oct 2004	Unlike XELB, I cannot speak for the sonic characteristics, though the 3875 has great bottom-end from what I hear. XELB may very well be right. But for 8 Ohm speakers I would probably go with the 3875. For 4 Ohms, the 3886 is the obvious choice. None of them will have any problem driving 90 db speakers at deafening levels. Here's schematics for the 3875: RMJ Audio

2nd May 2006, 03:07 AM	#4
mateo88 diyAudio Member Join Date: May 2004 Location: Argyle, Texas	Both the lm3875 and 3886 will sound good as long as you use an active pre. Like XELB said, it will be very lifeless without one.

2nd May 2006, 05:30 AM	#5
pwan diyAudio Member Join Date: Apr 2006 Location: Earth	You may wanna try OPA541 / OPA549 with big cap power supply.

2nd May 2006, 10:31 AM	#6
marginwalker diyAudio Member Join Date: Apr 2006	many thanks to you all! This is my first DIY project amd I've realized that building a 'very cool' (snubber large caps, regulated, buffer input) GC would be expansive (at least for me), so i decided to build a very simple IGC -as Nick do on DecibelDungeoun- with good components (Black Gaqe caps, Riken Ohm Res) and use my Harman Kardon HK680 as preamp. For the power supply i'm gonna use two Skynet 8080 bridged. What do you think about this choice?

2nd May 2006, 02:47 PM	#8
phn diyAudio Member Join Date: Oct 2004	I second pwan. The 1000 uF/50 V Rubycon cap costs $3 and is one of the best. A bipolar 4.7 uF BG costs about as much and could be an alternative. At least to more expensive film caps like Auricaps. The chip, if I'm correct, costs about €10. Don't spend much more than that on the rest of the components. And don't waste money on stupid "audio-grade" connectors and stuff. The intestines of the Gaincard