OPAxxx chip series

soundNERD · 26th March 2004, 01:20 AM

how much power can the opa541 deliver? how about the other OPA chips?

I want to power an 8" 8ohm sub with it.

the chip I would use is the plastic package.

thanks!
-Mike

loong · 26th March 2004, 04:32 AM

My friend just tried the OPA541 because he thought the JFet input might be good. Using the same circuit as 3875 (25Vdc,22K/680 R) on 8Ohm speaker, the sound not much different as expected. Particularly compared the cost (US$16.xx for OPA541 compared US$4.xx for LM2875). Probably, it might be good for 4 Ohm speaker I guess.

Alcaid · 26th March 2004, 07:46 AM

OPA541AP can deliever 5A continously and 10A peak.
[5A/(sqrt2)] * 8ohm = 100W RMS
[5A/(sqrt2)] * 4ohm = 50W RMS

This is just theoretically though. Max voltage for the AP version is +/-35V and it svings to approx. [rail - 4,5V].

The OPA549 can deliever 8A continously, but here the max voltage is lower (+/-30V).

Alcaid · 26th March 2004, 07:50 AM

Would have been fun though if the OPA512SM wasn't NRND. +/-50V and 15A peak

soundNERD · 26th March 2004, 11:42 AM

If I were to use the 549 with an appropriate voltage, what kind of power levels can I expect?

soundNERD · 26th March 2004, 11:43 AM

Quote:

Originally posted by Alcaid
Would have been fun though if the OPA512SM wasn't NRND. +/-50V and 15A peak

and what does NRND mean anyway?

Alcaid · 26th March 2004, 01:46 PM

Not Recomended for New Designs.
That means that they have decided to stop producing them
They don't deliever samples when a device is NRND

till · 26th March 2004, 09:15 PM

Quote:

If I were to use the 549 with an appropriate voltage, what kind of power levels can I expect?

I made some measurements with a lower voltage version, my computer speaker amp : http://www.diyaudio.com/forums/showt...842#post351842

voltage should be somthing less +-(15V * 1,4)

The amp:

till · 26th March 2004, 09:19 PM

The only expensive part on this amp was the transformer, 17,95€ Reichelt.

Connectors and Aluminium was from junk / University. Everything inside is point to point with 0,8 mm silver plated solid CU. Some steel between transformer and cicuit. Rectifier is made from some TO247 discrete diodes. Gain is 10, standart 1% metalfilm resitors used.

soundNERD · 27th March 2004, 01:08 AM

ok looks like im leaning toward the 541 for my sub amp?

26th March 2004, 01:20 AM	#1
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	OPAxxx chip series how much power can the opa541 deliver? how about the other OPA chips? I want to power an 8" 8ohm sub with it. the chip I would use is the plastic package. thanks! -Mike

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26th March 2004, 04:32 AM	#2
loong diyAudio Member Join Date: Feb 2004 Location: Earth	My friend just tried the OPA541 because he thought the JFet input might be good. Using the same circuit as 3875 (25Vdc,22K/680 R) on 8Ohm speaker, the sound not much different as expected. Particularly compared the cost (US$16.xx for OPA541 compared US$4.xx for LM2875). Probably, it might be good for 4 Ohm speaker I guess.

26th March 2004, 07:46 AM	#3
Alcaid diyAudio Member Join Date: Nov 2003 Location: Klepp	OPA541AP can deliever 5A continously and 10A peak. [5A/(sqrt2)] * 8ohm = 100W RMS [5A/(sqrt2)] * 4ohm = 50W RMS This is just theoretically though. Max voltage for the AP version is +/-35V and it svings to approx. [rail - 4,5V]. The OPA549 can deliever 8A continously, but here the max voltage is lower (+/-30V).

26th March 2004, 07:50 AM	#4
Alcaid diyAudio Member Join Date: Nov 2003 Location: Klepp	Would have been fun though if the OPA512SM wasn't NRND. +/-50V and 15A peak

26th March 2004, 11:42 AM	#5
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	If I were to use the 549 with an appropriate voltage, what kind of power levels can I expect?

26th March 2004, 01:46 PM	#7
Alcaid diyAudio Member Join Date: Nov 2003 Location: Klepp	Not Recomended for New Designs. That means that they have decided to stop producing them They don't deliever samples when a device is NRND

27th March 2004, 01:08 AM	#10
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	ok looks like im leaning toward the 541 for my sub amp?

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