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Old 31st October 2007, 02:47 AM   #1
bojo2 is offline bojo2  Australia
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Default paralled/bridged LM3886

Howdy.

Does anyone have any experience with this design?. The National semiconductor datasheets show it.

The one i'm thinking about building is shown on page 15.

It doesn't seem to hard to build. Anyone know what it sounds like or has built one before?.

Either that or i will build a simpler bridged version, but ideally i'd like to run a sub of it, so the more oomph the better.
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Old 31st October 2007, 03:01 AM   #2
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Parallel ( 2 chips ) if you want to drive low impedance loads like 4 ohms at full supply voltage . Bridged ( 2 chips) for 8 ohm and more power . Bridged/ parallel ( 4 chips ) for more power into 4 ohms.
All seem to be good as you can see many people selling pcb's for these applications.
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Old 31st October 2007, 03:08 AM   #3
bojo2 is offline bojo2  Australia
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howdy thanks for killer quick response.

i haven't seen many sites selling pcbs for bridged & paralled mode.
(eg 4 lm3886s driving one channel).

Any links or sites?, would be easier than me designing one myself lol
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Old 31st October 2007, 05:57 AM   #4
CJ900RR is offline CJ900RR  Sweden
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The BPA300 (found here at alex88's website) is one of the best sounding I have ever heard.

I've made my own boards and still have some left. But they need to be modded cause of oscillation issues. After some testing I've come to the conclusion that alex88's setup is better, two PA150-boards.

Click the image to open in full size.
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Old 31st October 2007, 10:38 PM   #5
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Quote:
I've made my own boards and still have some left.
I'll take them ! Learning by burning, but at the end a really great result.

Really serious Calle i'll take them

Regards
artQuake
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Old 1st November 2007, 02:21 AM   #6
bojo2 is offline bojo2  Australia
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It's a shame your boards have some problems.

I really like the look of yours better haha.
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Old 19th November 2007, 01:01 PM   #7
h3ad is offline h3ad  Australia
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how many of those boards do you have??
and if you have any spares would u sell/donate any?

i have never built a parallel/bridged CG before and it would be extra fun having 2 troubleshoot the circuit aswell
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Old 19th November 2007, 02:25 PM   #8
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Does anyone run their BPA100 ( 2x LM3886 in parallel )at +/- 40 Volts ( no load voltage ) ? Using a 4 ohm load of course !

I tried mine at +/- 40 Volts that drops to about +/- 35 volts on load ( clipping ) and gets very hot . Any long term problems possible ?

Distortion seems slightly lower at higher voltage operation ( on the FFT ).
Cheers.
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Old 20th November 2007, 06:58 AM   #9
CJ900RR is offline CJ900RR  Sweden
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Quote:
Originally posted by h3ad
how many of those boards do you have??
and if you have any spares would u sell/donate any?

i have never built a parallel/bridged CG before and it would be extra fun having 2 troubleshoot the circuit aswell

Hi.

I had 8 boards but they are allready given away. Sorry. But im working on a updated version, but I have splitted them into PA150-config instead.

I may be order some boards soon, but they are also made for surface components mostly.
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Old 20th November 2007, 09:38 AM   #10
h3ad is offline h3ad  Australia
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oh ok thats allright then
i cant solder SMD's... i tried once... didnt go 2 well lol

regards haydn
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