LM 3886 kit recomendation

[pguerin]

Hello everybody,

Wich lm3886 stereo kit or bare PCB can you recommend ?

Modulus 86 boards seems interresting, but too expensive IMHO.

 

[Philfr]

Hi P....,
Modulus 86 is a very good way, maybe the best way for LM..
Cheaper, kit from Chipamp.com :
http://www.diyaudio.com/forums/chip-amps/265827-lm3886-fullrange.html
What is your speakers today ?
Phil.

 

[djonesii]

Having built one of the X-Y ebay kits, I can say that they do indeed function, and I'm pretty happy with the sound. There are probably 1000's of posts on the board about this.

In hind sight, I think I would have rather gone for the chipamp.com kit mentioned above as after all my readings, I think the PS board is better.

YMMV as they say on the boards.

Dave

 

[pguerin]

Hi Phil,

What is your speakers today ?

My speakers are still the Nomex 164 from TG.

I'm planning to build the Elsinore from Joe Rasmussen this summer, a kind of upgrade 🙂

Best regards,

Pascal

 

[Philfr]

Hi Pascal,
LM3886 "fullrange" will be fine with the Elsinore, it can get about 55 watts..
Total cost is between 200/300 euros, depends of quality of case, connectors and so.
Two guys built this amp with sucess, and I can help you to find components.
Regards.
Phil.

 

[John C]

Hi Pascal,

If you are going to build Joe's speakers..... then his "current" amplifier would be the logical or even the only choice....

I have a First Watt F1J current amp and it's just amazing.... my speakers are REF3A Episode and it works superbly with them. I will not change my amp....ever...

regards

 

[John C]

Here....

http://www.diyaudio.com/forums/chip...-watt-transconductance-current-amplifier.html

 

[Philfr]

Hi,
I don't knaw nothing about Joe Rasmussen "Trans-Amp", but it use LM3875, basically 3875 don't works with 4 Ohm load, except with very low power and low distorsion..
What power with Trans-Amp in 4 ohm load ?
Phil.

 

[pguerin]

I also own a linear 2X38v PSU And an 1U case, I'm thinking of buying two Hypex UCD 180 HG amp module has an alternative. Any advice ?

 

[xrk971]

Has anyone tried one of these Chinese amps from Aliexpress? I figured I would give the LM3886 a try with this $40 entry. This one has an OPA2604 and speaker protection relay.

Wholesale Product Snapshot Product name is YJ LM3886+OPA2604 68W+68W Amplifier completed board + sound effect +Speaker protect

 

[wdecho]

You may want to consider this from an American seller. Yuan-Jing has a good track record but I have never tried this board. I have built both the 3875 and 3886 amp and with my system the 3875 sounds better.

Yuan-Jing 2 x 68W LM3886 + NE5532 Audio Amplifier Board

 

[xrk971]

Thanks for the tip. The one I ordered uses a different op amp and has a relay for speaker pop protection. I ordered it already so just a matter of time before trying it.

 

[wdecho]

Thanks for the tip. The one I ordered uses a different op amp and has a relay for speaker pop protection. I ordered it already so just a matter of time before trying it.

For the money the 3886 is a good amplifier. It sounds perfectly fine on a pair of cone speakers I use in my kitchen. On my main horn system the 3875 sounds better. I used this preamplifier for a while with the 3886 and it makes for a good system. Not a bad preamplifier for the money.


Little Bear P3 6N3 Tube Valve Preamp Amplifier Preamplifier Class A New Ver1 2 | eBay

 

[redjr]

Not sure if there are any available still, but search for Pavel and the PA-03. There was a group buy several months ago. Not sure what the status is now. This is a very good implementation of the LM4780 (dual 3886), and the PCB has an excellent layout. I am very pleased with how it sounds.

 

[djoffe]

If you're looking for a complete kit (enclosure, regulated power supply, all connectors, screws, and fittings)...

GT-101 Stereo Power Amplifier

 

[xrk971]

Thanks for the tip. The one I ordered uses a different op amp and has a relay for speaker pop protection. I ordered it already so just a matter of time before trying it.

The amp arrived today, looks well made. It has a couple of Burr Brown op amps on the front end. I was thinking of powering it with two 19v SMPS laptop bricks - will that work to just try out, albeit not at max power capability?

There appears to be a 3-position jumper in front of the chip amps, I wonder if that is used to set the gain via resistor network?

 

[xrk971]

LM3886 Works Great with Dual 19v SMPS

I just hooked up a pair of $6 19v 4.65amp SMPS laptop bricks in series for a +/-19v dual rail supply. I had an old massive Pentium solid copper CPU heatsink lying around so drill & tap a couple of 8-32 threaded holes and screwed the chips on tight. Hooked it up to my full range PA130-8 drivers mounted in a Karlsonator. Listening to some Miles Davis right now. Sounds great! The speaker protection relay works - no popping. I think this is a great buy at $40. Skipping the big iron toroidal 24v trafo ($60) is a nice bonus. I think I have plenty of power with the two 19v bricks. 😀

Subjectively, this amp sounds very nice. 🙂

 

[xrk971]

Listen to this LM3886 amp in blind test

You can listen to this amp in a blind test of XO topologies here:
http://www.diyaudio.com/forums/multi-way/277691-s-harsch-xo-4.html#post4407112

Sound clips (change .asc to .mp3 to listen):
http://www.diyaudio.com/forums/attachments/multi-way/496341d1438327484-s-harsch-xo-clip-2-xo.asc

http://www.diyaudio.com/forums/attachments/multi-way/496342d1438327492-s-harsch-xo-clip-2-b-xo.asc

http://www.diyaudio.com/forums/attachments/multi-way/496343d1438327503-s-harsch-xo-clip-3-xo.asc

http://www.diyaudio.com/forums/attachments/multi-way/496344d1438327514-s-harsch-xo-clip-3-bxo.asc

Can you hear the difference between this:

and this:

given that their step responses look like this:

and phase looks like this?