opa541

sss · 6th August 2004, 09:14 AM

hello eveerybody

guys i wanna know if bridged opa541 can handle 8ohm speaker (not paralelled ) with max voltage supply (+-40V) without overheating

also
i read the whole datasheets and found nothing about thermal protection , so i guess there is no thermal protection , right?

carlosfm · 6th August 2004, 09:33 AM

Never use max. voltage on a power op-amp.
It will overheat.
Does true 8 ohm speakers still exist?
Speakers always have impedance dips across the range, some 8 ohm speakers can have impedance dips to as low as 3 ohms, usually in the bass, and specially bass-refex speakers.
I would use the 541 at +/- 30~32v, no more.

With two chips, I would prefer to parallel than bridge them.
Or bridge-parallel, but that's 4 chips per channel minimum.

sss · 6th August 2004, 10:23 AM

thanx for the reply Carlos
i guess its better to use the opa549 with ~28V supplies

gengcard · 6th August 2004, 10:27 AM

Hi

Oh

minimum 4 chips per channel.
I cannot build the high watts amplifier because my loudspeakers are just 100W

6th August 2004, 09:14 AM	#1
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	opa541 hello eveerybody guys i wanna know if bridged opa541 can handle 8ohm speaker (not paralelled ) with max voltage supply (+-40V) without overheating also i read the whole datasheets and found nothing about thermal protection , so i guess there is no thermal protection , right?

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6th August 2004, 09:33 AM	#2
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	Never use max. voltage on a power op-amp. It will overheat. Does true 8 ohm speakers still exist? Speakers always have impedance dips across the range, some 8 ohm speakers can have impedance dips to as low as 3 ohms, usually in the bass, and specially bass-refex speakers. I would use the 541 at +/- 30~32v, no more. With two chips, I would prefer to parallel than bridge them. Or bridge-parallel, but that's 4 chips per channel minimum.

6th August 2004, 10:23 AM	#3
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	thanx for the reply Carlos i guess its better to use the opa549 with ~28V supplies

6th August 2004, 10:27 AM	#4
gengcard diyAudio Member Join Date: Jun 2004 Location: Bangkok	Hi Oh minimum 4 chips per channel. I cannot build the high watts amplifier because my loudspeakers are just 100W

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