opa549 sub amp prob

odysseybmx414 · 16th May 2005, 01:45 PM

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?

miguel2 · 16th May 2005, 01:56 PM

Are you using +/-42 VDC? The limit of the 549 is +/-30 VDC. That can be the cause.

Miguel

odysseybmx414 · 16th May 2005, 02:29 PM

no it is +-21vdc

odysseybmx414 · 16th May 2005, 02:33 PM

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

pinkmouse · 16th May 2005, 02:37 PM

For low impedance loads like 2 ohm, you need more current rather than more voltage...

miguel2 · 16th May 2005, 03:27 PM

Quote:

i have paralleled two opa549s

Have you tried each single chip by itself?

Miguel

Alcaid · 18th May 2005, 10:36 AM

How much gain are you using?

PKS · 19th May 2005, 05:29 PM

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.

gfiandy · 19th May 2005, 09:49 PM

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.

Regards,
Andrew

16th May 2005, 01:45 PM	#1
odysseybmx414 diyAudio Member Join Date: Feb 2005 Location: Watertown, NY	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?

16th May 2005, 02:37 PM	#5
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	For low impedance loads like 2 ohm, you need more current rather than more voltage... __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

19th May 2005, 05:29 PM	#8
PKS diyAudio Member Join Date: May 2005 Location: Dyri	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. __________________ PK; real norwegian noob.

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16th May 2005, 01:56 PM	#2
miguel2 diyAudio Member Join Date: Jun 2002 Location: Portugal	Are you using +/-42 VDC? The limit of the 549 is +/-30 VDC. That can be the cause. Miguel

16th May 2005, 02:29 PM	#3
odysseybmx414 diyAudio Member Join Date: Feb 2005 Location: Watertown, NY	no it is +-21vdc

16th May 2005, 02:33 PM	#4
odysseybmx414 diyAudio Member Join Date: Feb 2005 Location: Watertown, NY	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

18th May 2005, 10:36 AM	#7
Alcaid diyAudio Member Join Date: Nov 2003 Location: Klepp	How much gain are you using?

19th May 2005, 09:49 PM	#9
gfiandy Audio Engineer diyAudio Member Join Date: Jul 2003 Location: Cambridge UK	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. Regards, Andrew

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