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Old 16th May 2005, 01:45 PM   #1
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Default opa549 sub amp prob

i have paralleled two opa549s for a 2 ohm sub i have. everything on the circuit is what it should be except the rin is 68K instead of 47K because this is what i had. the music is very distorted. i am using 42dcv anybody know what it could be?
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Old 16th May 2005, 01:56 PM   #2
miguel2 is offline miguel2  Portugal
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Are you using +/-42 VDC? The limit of the 549 is +/-30 VDC. That can be the cause.

Miguel
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Old 16th May 2005, 02:29 PM   #3
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no it is +-21vdc
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Old 16th May 2005, 02:33 PM   #4
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i also have another question my transformer has two outputs: +-42vdc and also it has other secondaries of +9v,-9v i was wondering if i can use the +42v and the -9v to get a total of 51vdc a little more for my amp because i have a fully working 2 channel amp each channel consists of 2 opa549s bridged
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Old 16th May 2005, 02:37 PM   #5
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For low impedance loads like 2 ohm, you need more current rather than more voltage...
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Old 16th May 2005, 03:27 PM   #6
miguel2 is offline miguel2  Portugal
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Quote:
i have paralleled two opa549s
Have you tried each single chip by itself?

Miguel
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Old 18th May 2005, 10:36 AM   #7
Alcaid is offline Alcaid  Norway
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How much gain are you using?
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Old 19th May 2005, 05:29 PM   #8
PKS is offline PKS  Norway
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Default opa 541 paralleled

Hello.

I just wondered if anybody could help me:
Im building a mono power amp using two paralleled opa 541.
any recomendations(sorry my poor english! I am a norwegian)
sould i use one as a slave?
Or two paralleled circuits with the same gain?

And... Recomended gain? recomended opa in gainstage?

Regards

PK.
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Old 19th May 2005, 09:49 PM   #9
gfiandy is offline gfiandy  United Kingdom
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The most likely reason for this is instability. Make sure all the power supply decoupling capacitors are connected as close as possible to the power pins on the chip.

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Andrew
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