Does bridge of two LM3886 sound better? - Page 5 - diyAudio
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Old 29th March 2012, 10:21 AM   #41
AndrewT is offline AndrewT  Scotland
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no.
Go and read about DC servos.
Peranders has a good page.
This Forum has a very good thread.
There are many others, including the National Ap Note.
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Old 29th March 2012, 10:31 AM   #42
Roushon is offline Roushon  India
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Circuit A in post 32 is exactly the same as that given in the National
application notes except that I have to add the buffer before the amp.

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Old 30th March 2012, 10:13 AM   #43
Roushon is offline Roushon  India
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Old 31st March 2012, 07:10 AM   #44
Roushon is offline Roushon  India
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Default Final!

National AN-1192+T at output of servo
Attached Images
File Type: jpg MyGainClone-bridge-A.jpg (104.6 KB, 248 views)
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Old 14th August 2013, 06:17 PM   #45
jayadev is offline jayadev  India
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Undoubtedly Parallel sounds better.
my case is lm7293. they sound as smooth as butter.
reasons I percieve:
less heat generated on the die
more conduction due to additional parallels .
more current headroom hence higher dynamics from speakers
Higher damping.
less vulnerable to short circuits or overdrives.
Looks beautiful !
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Old 15th August 2013, 04:32 PM   #46
lgreen is offline lgreen  United States
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Default chipamps

I've made a single, a bridge and a parallel. Obviously the bridge runs very much hotter so you need good thermal sinking to have a reliable amp. I think they all sound pretty good, but I tend to use the parallel more probably because in the back of my mind I like the additional current drive. The bridge has more sparkle and the single is nice and crisp; bridge seems smoother.
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Old 16th August 2013, 05:12 PM   #47
jcx is offline jcx  United States
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unless you have 16 ohm speaker you really want to do both - always at least 2x parallel when bridging to keep current power proportionate to Vswing

in fact I'd probably over parallel for more current capability
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Old 16th August 2013, 05:41 PM   #48
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I found that the parallel sounded better -- but my implementation was via the LM4780 which is 2 lm3886 dies in one package.

One of the best things you can do with these chipamps was demonstrated at the NJ Audio Society by Bob Cordell -- he used a buffer/inverter to drive the inverting input of a LM3886. It really sounded nice driving 2 SEAS Thors which I had built, and a K-Works up-modded version of the Thors. I don't know whether he used his "Klever-Klipper" in between (as provisioned in his book.) Didn't ask him if he used a servo.
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Old 24th March 2014, 10:40 PM   #49
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Quote:
Originally Posted by Osvaldo de Banfield View Post
In any case the distortion will be multiplied: you have 2 amps generating noise and distortion compared to only one.
In a bridged circuit much of the common mode noise / distortion is cancelled. Distortion is lower on a bridged circuit.
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Old 24th March 2014, 10:44 PM   #50
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Quote:
Originally Posted by AndrewT View Post
Compare each to a single chipamp implementation.
Thats a good suggestion your ears would be the best judges.
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