AudioCircle

Industry Circles => Sonic Craft => Topic started by: OSIB16 on 23 Jan 2022, 08:38 pm

Title: RE: LM3886 BASED POWER AMP FOR ACTIVE SPEAKERS
Post by: OSIB16 on 23 Jan 2022, 08:38 pm

I need some guidance with an active loudspeaker project (Bang Olufsen BEOVOX CX100) that I intend to put together; which uses multiple LM3886 power amps. I need separate ones to power the tweeter, midrange and woofer. The photo below shows the actual LM3886 board that I intend to use. I’m going to swap the caps to Sonicap Platinum, Elna Silmic II, Mundorf AG with Mills resistors…
(https://www.audiocircle.com/image.php?id=235865)

Title: Re: RE: LM3886 POWER AMP FOR ACTIVE SPEAKERS
Post by: OSIB16 on 23 Jan 2022, 08:43 pm

Here is the suggested transformer…

(https://www.audiocircle.com/image.php?id=235869)

Title: Re: RE: LM3886 POWER AMP FOR ACTIVE SPEAKERS
Post by: OSIB16 on 23 Jan 2022, 08:49 pm

The suggested power regulator board…


(https://www.audiocircle.com/image.php?id=235870)

(https://www.audiocircle.com/image.php?id=235871)

(https://www.audiocircle.com/image.php?id=235872)

Title: Re: RE: LM3886 POWER AMP FOR ACTIVE SPEAKERS
Post by: OSIB16 on 23 Jan 2022, 08:54 pm

I would like to use a similar layout to this photo of a setup shown on YouTube…
(https://www.audiocircle.com/image.php?id=235873)

Title: Re: RE: LM3886 POWER AMP FOR ACTIVE SPEAKERS
Post by: OSIB16 on 23 Jan 2022, 08:57 pm

Here is a diagram that I created on an art software; which shows how I intend to put the project together ((it’s not perfect. Help needed))


(https://www.audiocircle.com/image.php?id=235880)

Title: Re: RE: LM3886 POWER AMP FOR ACTIVE SPEAKERS
Post by: dburna on 23 Jan 2022, 09:02 pm

One suggestion -- rather than spend big $$$ (and effort) on replacing caps with expensive variants -- an endless chase -- take a good look at Neurochrome amps: www.neurochrome.com (http://www.neurochrome.com). Those amps are much better than the ones you have listed and won't require the time/effort to modify. Plus, after you spend all the time/money on the caps, I bet the net cost is about equal. And you'll end up with a much better amp to boot.

Read about Neurochrome on their website and read comments on DIYAudio. You can thank me later.

Best, -dGB

P.S. Just re-read your post. If the boards are already a sunk cost for you -- looks like that is the case -- then, as Emily Latella used to say, "Nevermind".  :lol:

Title: Re: RE: LM3886 BASED POWER AMP FOR ACTIVE SPEAKERS
Post by: OSIB16 on 23 Jan 2022, 09:15 pm

Thanks, the Neurochrome stuff looks amazing. Unfortunately I have already purchased six of the black LM3886 (ready built boards) for a total of $80.