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Chip Amps Amplifiers based on integrated circuits

lm3886 parallel
lm3886 parallel
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Old 21st March 2019, 06:08 AM   #11
rookiesparks is offline rookiesparks  Guernsey
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Originally Posted by asuslover View Post
You could easily bridge them, add drv134 and adjust the power supply voltage so it could go with your speaker impedance. Will give you 100w in 4 ohms and 120w in 8ohms.
Again , I donít think that paralleling 2 boards will work, the idea is to parallel the chips and not the boards.

thanks for your input ! i have previously made a bridge setup as you mention with drv 134 with good success ! to my ears parallell lm3886 may not be as powerfull as bridged but does have a fuller sound ( all subjected ) ime experimenting with these boards as they do sound sweet singularly ! and at the end of the day if this project is a no no i might go bridged
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Old 21st March 2019, 06:22 AM   #12
Mark Whitney is online now Mark Whitney  Netherlands
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It could be anything. Have you taken any measurements? Power supplies are only 4A. You are meant to twist the power leads. Not possible to adjust the offset of each chip independently. Do I need to go on? So many bad design choices.
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Old 21st March 2019, 12:43 PM   #13
viyohepav is offline viyohepav
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Lm3886, you can parallel but not recommended for bridge
Taming the LM3886 Chip Amplifier

Last edited by viyohepav; 21st March 2019 at 12:56 PM.
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Old 21st March 2019, 01:19 PM   #14
kokoriantz is offline kokoriantz  Lebanon
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If I understood , you are paralleling to drive 8 ohms load to have a higher quality rather than higher power .
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Old 21st March 2019, 01:39 PM   #15
asuslover is offline asuslover  Romania
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lm3886 parallel
Quote:
Originally Posted by viyohepav View Post
Lm3886, you can parallel but not recommended for bridge
Taming the LM3886 Chip Amplifier
Plz read LM3886 - Application Note 1192 - Reference Design here:

http://www.ti.com/lit/an/snaa021b/snaa021b.pdf

There are a lot of great designs around bridged lm3886 , even lm4780.
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Old 21st March 2019, 02:01 PM   #16
viyohepav is offline viyohepav
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You can do bridge, yes.
but it is not recomended because of the power consumption, its also in the link you provide section 3.
Better go for parallel or bridge parallel.
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Old 21st March 2019, 11:57 PM   #17
kokoriantz is offline kokoriantz  Lebanon
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Originally Posted by viyohepav View Post
You can do bridge, yes.
but it is not recomended because of the power consumption, its also in the link you provide section 3.
Better go for parallel or bridge parallel.
Yes , you dissipate four times more power than a single , but keeping the same load impedance. If when bridged the load is double impedance, than total Pd becomes twice higher then a single all providing twice more power . By this Pout/Pd remains the same , each IC dissipating the same as running in single. This why the load impedance when bridged must remain higher than 8 ohm.

Last edited by kokoriantz; 22nd March 2019 at 12:01 AM.
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Old 22nd March 2019, 11:12 AM   #18
pitbul is offline pitbul
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For parallel amps, resistors which defines amplification on the LM3886 should be 0.1%,
after that there are no problems with it. Load share resistors on the outputs are mandatory.
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Old 22nd March 2019, 11:16 AM   #19
scottjoplin is offline scottjoplin  Wales
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Quote:
Originally Posted by rookiesparks View Post
basically identical,,all matched on home made jig consisting of a low voltage through different resistors and taking mill / volt reading with dmm
Quote:
Originally Posted by pitbul View Post
For parallel amps, resistors which defines amplification on the LM3886 should be 0.1%,
after that there are no problems with it. Load share resistors on the outputs are mandatory.
Yes, it's not certain he's able to measure them accurately enough
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Old 22nd March 2019, 12:01 PM   #20
rookiesparks is offline rookiesparks  Guernsey
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