Looking for LM3886 project (100W @8Ohm)

[strsljen]

Hi,

I am looking for a DIY project based on LM3886 which could deliever 100W @8 ohm per channel.
There are some projects out there (for example: https://electronics-diy.com/100w-lm3886-power-amplifier.php), but they refer to 4 Ohm and 100W.

Is it even possibe to use LM3886 in some configuration which would be able to deliever requested output?
Apologies if this was already discussed here. I checked, but didn't find it.

Thanks in advance!

Best regards,

Mario.

 

[adason]

Yes, it is possible. Yes, it was discussed many times. Yes, you did not search right. But i will let Tom (tomchr) reply.
https://www.diyaudio.com/community/threads/rowland-lm3886.286969/
https://www.aliexpress.com/item/1005004918402838.html

 

[adason]

In the spec jeff rowland claims 350 watts with six lm3886.
https://skyfiaudio.com/products/jeff-rowland-model-12-four-piece-mono-block-amplifiers-wow

 

[Nisbeth]

You need to run more than one chip per channel, either in parallel or in bridge mode depending on you load impedance. You can refer to the BPA300 amplifier rapplication note for more information and of course to countless other threads here 🙂

 

[HAYK]

It is much easier with TDA7293X2 parallel. You can find by Google many public domain PCBs or board from Ali.
https://aliexpress.com/item/4000092889019.html

 

[tomchr]

In the spec jeff rowland claims 350 watts with six lm3886.

As do I: https://neurochrome.com/products/modulus-686

I suggest starting here, though: https://neurochrome.com/pages/output-power

Tom

 

[brunomiguel]

Hello
I develop very recently the pcb's witch I show here:

Or you may wanna check out my other solutions like PA150 or other here:
https://www.ebay.de/usr/dialedinmusic?_trksid=p4429486.m3561.l2559

 

[DaveFred]

https://www.aliexpress.com/item/1005004918402838.html

Have you seen any reports of a build of a build with that board?

 

[adason]

No.

 

[strsljen]

Thank you all for useful replies and links. I am starting with the ones Tom posted.

Mario.

 

[Berlusconi]

Have you seen any reports of a build of a build with that board?

No.

First, thanks @adason for mentioning this board.
Now, I have one channel based on this board and it looks like indeed a promising project. Right now it is on my test bench and I have completed prelimminary meassurements. It has great frequency response and incredibly good square wave response.
Now, I'm testing its endurance on 200W 7.3 ohm dummy load. For time being I was able to run it at 125W constant 1KHz signal. I do really push it at the limits of thermal endurance.
Otherwise, the board is a real beauty, very well designed with wonderful layout. It is going to have from me a beauyiful chasis.
I intend to start a new thread devoted to this project. It will be fun. Very soon, perhaps this weekend.
Untill then, have a pleasant time.