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-   -   Class D bridging with this product (http://www.diyaudio.com/forums/class-d/52688-class-d-bridging-product.html)

jaychocolate 2nd March 2005 08:21 PM

Class D bridging with this product
 
First post here, so bear with me.

I am looking for a way to bridge two identical (car)audio mono aplifiers 1 ohm stable.
Is it possible to use such a product?

http://www.bmm-electronics.nl/Produc...roduct_ID=3224

I understood that there might be a problem to power the above article, but can't this be done with the dc/dc convert inside of the amp?

Also regarding the common ground for the bridging (if possible?) Can't this just be connected together from each amplifer?

Would be nice if anyone could answer, as ordinary car audio people don't seem to have that much knowledge about it.

If charts over the aplifiers pcb's is needed to answer, I'd be glad to provide them.

JohnW 2nd March 2005 09:52 PM

If I had to place a bet - I would say that the outputs of your amps. are already bridged - which means you cannot use 2 amps to increase power - unless you have a dual voice coil speaker - one amp per coil.

John

jaychocolate 3rd March 2005 02:51 PM

Hi there, the speaker is infact a 2 ohm dual voice coil woofer

UrSv 3rd March 2005 03:08 PM

If your amps outputs are completely floating with respect the ground and positive then it might be possible to run them in series on the outputs to obtain twice the output voltage. Check the manual.

jaychocolate 3rd March 2005 07:11 PM

It doesn't state anything in the manual. But I'd be happy to post the chart over the PCB. I am not really that good at reading it myself.

jaychocolate 4th March 2005 05:17 PM

Anyone got a clue, before I start spending? Or maybe even another way to solve my problem?

Workhorse 6th March 2005 11:13 AM

Quote:

Originally posted by JohnW
If I had to place a bet - I would say that the outputs of your amps. are already bridged - which means you cannot use 2 amps to increase power - unless you have a dual voice coil speaker - one amp per coil.

John


Hi john,
You are right about this amp, but there exist a way by which you can bridge an already bridged amp. but it requires seperate power supplies for the proper operation. Crown and Qsc [pl9.0] uses grounded bridge topology for this type of implementation.

regards,
kanwar

jaychocolate 6th March 2005 05:56 PM

Well, delighted to hear that it's possible with other products.
About the seperate power supply, what needs to be done? Can I use the above mentioned product, or are there any other ways to bridge an already bridged amplifier?

If anyone knows how to compress a pdf into a size that this forum allows, I'd be able to post the pcb chart. Unfortunately its 1,1 mb zipped.

Workhorse 8th March 2005 12:59 PM

Hi buddy
 
2 Attachment(s)
Quote:

Originally posted by jaychocolate
Well, delighted to hear that it's possible with other products.
About the seperate power supply, what needs to be done? Can I use the above mentioned product, or are there any other ways to bridge an already bridged amplifier?



Hi chocolate_jay,
Its not possible with the mentioned product.
See the picture for more clarification on QUAD BRIDGING TOPOLOGY.
Hope you understand it.

regards,
kanwar

jaychocolate 8th March 2005 01:32 PM

2 Attachment(s)
For those experienced enough, here's the chart over the PCB.

Sorry for the resolution


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