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Old 14th October 2003, 02:35 PM   #1
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Default How do I bridge a OPA549?

Hi everyone,

I have a couple of OPA549 as samples and wish to build a bridge amp out of them. My purpose would be as a sub amp, nothing special, just want to bridge them for more power.

Any ideas, schematics, procedures are very welcome.

Thanks in advance, regards,
JojoD
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Old 14th October 2003, 03:16 PM   #2
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www.national.com/an/AN/AN-1192.pdf

See page 5 .............mike
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Old 14th October 2003, 03:17 PM   #3
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would TI be of any help? Like the datasheet or application notes?
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Old 14th October 2003, 03:42 PM   #4
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Default thanks

thanks mike.

So the OPA549 is just an opamp with high output current right?

Best regards,
JojoD
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Old 14th October 2003, 04:34 PM   #5
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http://focus.ti.com/docs/prod/produc...tNumber=OPA549

Yep ....... Jfet inputs so a little differant than the ubiquitous LMetc. Consider your load before you bother bridging. If you overtax (set off the protection), they don't sound too good.
........mike
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Old 14th October 2003, 06:13 PM   #6
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Default parallel only

Hi,

In the TI datasheet for the 549, I can only find a parallel setup. This is not the same as bridge right?

My other question is, can I use the application note AN1192 from National to a chip made by TI? I mean can I apply the techniques in the National appnotes to the TI chips?

Thanks!
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Old 14th October 2003, 06:26 PM   #7
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Yes the techniques are the same but the specs are differant for the 2 devices. Same basic circuit should work. (probably better )
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Old 14th October 2003, 06:30 PM   #8
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mike,

Alright! Thanks a lot! At least I know what I'm getting into. If you have any other ideas please let me know.

Cheers,
JojoD
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Old 15th October 2003, 06:43 PM   #9
Mad_K is offline Mad_K  Norway
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have you searched?

this one is nice if you already have a balanced signal
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Old 16th October 2003, 09:28 AM   #10
sangram is online now sangram  India
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For my subwoofer project I got a few OPA 549S chips, and some DRV 134 burr-Brown Line balanced drivers, nice if you only have a single-ended input and want to drive a bridged amp.

There is also a method of using a single resistor to bridge amps, Which I have found degrades sound in some cases and improves it on others. You may want to try this.

In addition if you have a buffer amp capable of driving low impedance ~100 ohms, you could drive one amp from its + input and other through the - input. I do not see any major advantage of doing this over the method explained in the much-quoted AN1192, but it is an alternative anyway.
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