How do I bridge a OPA549?

JojoD818 · 14th October 2003, 02:35 PM

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

hitsware · 14th October 2003, 03:16 PM

www.national.com/an/AN/AN-1192.pdf

See page 5 .............mike

millwood · 14th October 2003, 03:17 PM

would TI be of any help? Like the datasheet or application notes?

JojoD818 · 14th October 2003, 03:42 PM

thanks mike.

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

Best regards,
JojoD

hitsware · 14th October 2003, 04:34 PM

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

JojoD818 · 14th October 2003, 06:13 PM

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!
JojoD

hitsware · 14th October 2003, 06:26 PM

Yes the techniques are the same but the specs are differant for the 2 devices. Same basic circuit should work. (probably better

)

JojoD818 · 14th October 2003, 06:30 PM

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

Mad_K · 15th October 2003, 06:43 PM

have you searched?

this one is nice if you already have a balanced signal

sangram · 16th October 2003, 09:28 AM

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.

14th October 2003, 02:35 PM	#1
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	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

14th October 2003, 03:42 PM	#4
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	thanks thanks mike. So the OPA549 is just an opamp with high output current right? Best regards, JojoD

14th October 2003, 06:13 PM	#6
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	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! JojoD

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14th October 2003, 03:16 PM	#2
hitsware diyAudio Member Join Date: Mar 2002	www.national.com/an/AN/AN-1192.pdf See page 5 .............mike

14th October 2003, 03:17 PM	#3
millwood Account Disabled Join Date: Apr 2003 Location: US	would TI be of any help? Like the datasheet or application notes?

14th October 2003, 04:34 PM	#5
hitsware diyAudio Member Join Date: Mar 2002	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

14th October 2003, 06:26 PM	#7
hitsware diyAudio Member Join Date: Mar 2002	Yes the techniques are the same but the specs are differant for the 2 devices. Same basic circuit should work. (probably better )

14th October 2003, 06:30 PM	#8
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: searching...	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

16th October 2003, 09:28 AM	#10
sangram diyAudio Member Join Date: Sep 2002 Location: India	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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