Using 2 chips to boost voltage handling

soundNERD · 31st January 2005, 12:03 AM

If I remember correctly, isn't there some way to hook two chips together to allow double the power supply voltage? What I want to do is power an OPA549 above +/-30 to allow higher voltage output and therefor higher wattage output.

Thanks!
-Mike

loong · 31st January 2005, 05:06 AM

Do you mean the bridge config? If so, you can see the AN-1192 App Note for some detail.

pinkmouse · 31st January 2005, 10:31 AM

Bridging will increase the voltage seen by the speaker, but not allow you to increase the psu rails, so you will still need the same transformer.

richie00boy · 31st January 2005, 10:42 AM

Also bear in mind that bridging causes the load seen by the amp to halve, thus you will be limited to 8 ohm speakers with most chips.

boholm · 31st January 2005, 10:42 AM

If you give your OPA549 more than +/- 30 volts, it will be destroyed.

Bridging is the trick to use: http://sound.westhost.com/bridging.htm

demogorgon · 31st January 2005, 10:51 AM

how about runing one chip on +60v and a nother at -60v, and running them as bridged?

just a quick thought from the top of my head..

richie00boy · 31st January 2005, 11:05 AM

Then you will have a nice 60 volt DC offset going though your voice coil and a nasty smell in the room, if not flames

azira · 31st January 2005, 03:34 PM

Quote:

Originally posted by demogorgon
how about runing one chip on +60v and a nother at -60v, and running them as bridged?

just a quick thought from the top of my head..

not bridged, parallel... I had an idea like this more than once. Probably need diodes in the output of each amp to prevent them from driving eachother... also would have to deal with crossover distortion.

ErikdeBest · 31st January 2005, 03:40 PM

Quote:

Originally posted by azira

not bridged, parallel... I had an idea like this more than once. Probably need diodes in the output of each amp to prevent them from driving eachother... also would have to deal with crossover distortion.

As Loong said: you can see the AN-1192 App Note for some detail.

It has been discussed, builded and tested through people from this forum...and...you can find AN-1192 at the website of national, I think it is www.national.com

AudioFreak · 31st January 2005, 03:55 PM

Quote:

Originally posted by ErikdeBest

As Loong said: you can see the AN-1192 App Note for some detail.

It has been discussed, builded and tested through people from this forum...and...you can find AN-1192 at the website of national, I think it is www.national.com

AN-1192 isn't going to help much is this situation.

31st January 2005, 12:03 AM	#1
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	Using 2 chips to boost voltage handling If I remember correctly, isn't there some way to hook two chips together to allow double the power supply voltage? What I want to do is power an OPA549 above +/-30 to allow higher voltage output and therefor higher wattage output. Thanks! -Mike

31st January 2005, 10:31 AM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Bridging will increase the voltage seen by the speaker, but not allow you to increase the psu rails, so you will still need the same transformer. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

31st January 2005, 10:42 AM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Also bear in mind that bridging causes the load seen by the amp to halve, thus you will be limited to 8 ohm speakers with most chips. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

31st January 2005, 10:42 AM	#5
boholm diyAudio Member Join Date: Apr 2004 Location: Copenhagen	If you give your OPA549 more than +/- 30 volts, it will be destroyed. Bridging is the trick to use: http://sound.westhost.com/bridging.htm __________________ Best regards Bo

31st January 2005, 11:05 AM	#7
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Then you will have a nice 60 volt DC offset going though your voice coil and a nasty smell in the room, if not flames __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more


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31st January 2005, 05:06 AM	#2
loong diyAudio Member Join Date: Feb 2004 Location: Earth	Do you mean the bridge config? If so, you can see the AN-1192 App Note for some detail.

31st January 2005, 10:51 AM	#6
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	how about runing one chip on +60v and a nother at -60v, and running them as bridged? just a quick thought from the top of my head..

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