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Old 6th August 2004, 09:14 AM   #1
sss is offline sss  Israel
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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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Old 6th August 2004, 09:33 AM   #2
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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.
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Old 6th August 2004, 10:23 AM   #3
sss is offline sss  Israel
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thanx for the reply Carlos
i guess its better to use the opa549 with ~28V supplies
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Old 6th August 2004, 10:27 AM   #4
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Hi

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