Parallel with different chips!

Matthewong · 9th October 2007, 08:59 AM

I would like to ask whether I can parallel LM3886 with TDA2050 together, Thank you.

SpittinLLama · 9th October 2007, 11:36 PM

I didn't look at the TDA datasheet but if both chips are the same type of output then as long as the gains are matched and use ballast resistors then it should work just like using two LM3886 chips.

-SL

tangmonster · 10th October 2007, 11:01 AM

I might be wrong but

building a car with two of the same type of engines connected to one gearbox seems like a possible solution to get more torque.

But building a car with two different sized engines connected to one gearbox seems to be just not a good idea. It will probably work, you may have a bit more power , but a single engined car will be so much lighter en simpler and easier to service...

just my feeling on this idea.

richie00boy · 10th October 2007, 11:22 AM

It won't work reliably, the LM chip is more powerful than the TDA and their frequency responses will be different which could cause problems.

SpittinLLama · 10th October 2007, 09:52 PM

OK, so I looked at the datasheets and it is not worth the trouble. The TDA2050 is not powerful enough. The TDA2050 can only be run as high as a +/-25 supply while the LM3886 can run up to +/-42V. Even if you parallel into 4 ohms so that each IC sees 8 ohms you still are limited to +/-25V maximum. This means no more power than the LM3886 by itself driving that same 4 ohms, and less because the LM3886 is rated at +/-28V for a 4 ohm load. Now if you're looking to drive <4 ohms then there might be some merit to it. Overall, get better matched ICs to do some parallel design.

-SL

Matthewong · 11th October 2007, 03:12 AM

Thanks a lot guys.

I_Forgot · 11th October 2007, 04:46 AM

Hey, I like this idea. This is thinking "out of the box"!

One chip has a nice beefy bass with an unassuming upper register and the other contributes overtones of nutmeg and dark chocolate. You'll never find that combination in a single chip design!

I_F

DigitalJunkie · 11th October 2007, 05:15 AM

Quote:

Originally posted by I_Forgot
Hey, I like this idea. This is thinking "out of the box"!

One chip has a nice beefy bass with an unassuming upper register and the other contributes overtones of nutmeg and dark chocolate. You'll never find that combination in a single chip design!

I_F

Could be good for a 2-way/bi-amped setup.

Speedskater · 11th October 2007, 05:34 PM

No, if the two chips don't have almost identical frequency and gain response they will fight each other every inch of the way. Each will try to force the other to whatever voltage that it thinks is correct at that instant.

I_Forgot · 11th October 2007, 10:27 PM

Quote:

Originally posted by Kevin Graf
No, if the two chips don't have almost identical frequency and gain response they will fight each other every inch of the way. Each will try to force the other to whatever voltage that it thinks is correct at that instant.

That struggle, like an artist struggling to master his medium, is the source of the flavor of the mixed parallel chip amplifier!

I_F

9th October 2007, 08:59 AM	#1
Matthewong diyAudio Member Join Date: Jun 2005 Location: KL	Parallel with different chips! I would like to ask whether I can parallel LM3886 with TDA2050 together, Thank you.

10th October 2007, 11:22 AM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	It won't work reliably, the LM chip is more powerful than the TDA and their frequency responses will be different which could cause problems. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

11th October 2007, 05:34 PM	#9
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	No, if the two chips don't have almost identical frequency and gain response they will fight each other every inch of the way. Each will try to force the other to whatever voltage that it thinks is correct at that instant. __________________ Kevin

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9th October 2007, 11:36 PM	#2
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	I didn't look at the TDA datasheet but if both chips are the same type of output then as long as the gains are matched and use ballast resistors then it should work just like using two LM3886 chips. -SL

10th October 2007, 11:01 AM	#3
tangmonster diyAudio Member Join Date: Jul 2007 Location: Cape Town	I might be wrong but building a car with two of the same type of engines connected to one gearbox seems like a possible solution to get more torque. But building a car with two different sized engines connected to one gearbox seems to be just not a good idea. It will probably work, you may have a bit more power , but a single engined car will be so much lighter en simpler and easier to service... just my feeling on this idea.

10th October 2007, 09:52 PM	#5
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	OK, so I looked at the datasheets and it is not worth the trouble. The TDA2050 is not powerful enough. The TDA2050 can only be run as high as a +/-25 supply while the LM3886 can run up to +/-42V. Even if you parallel into 4 ohms so that each IC sees 8 ohms you still are limited to +/-25V maximum. This means no more power than the LM3886 by itself driving that same 4 ohms, and less because the LM3886 is rated at +/-28V for a 4 ohm load. Now if you're looking to drive <4 ohms then there might be some merit to it. Overall, get better matched ICs to do some parallel design. -SL

11th October 2007, 03:12 AM	#6
Matthewong diyAudio Member Join Date: Jun 2005 Location: KL	Thanks a lot guys.

11th October 2007, 04:46 AM	#7
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	Hey, I like this idea. This is thinking "out of the box"! One chip has a nice beefy bass with an unassuming upper register and the other contributes overtones of nutmeg and dark chocolate. You'll never find that combination in a single chip design! I_F

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