BPA-200 from BGT LM4780 kit?

maxw · 15th April 2005, 05:08 AM

I am wondering if it would be possible to make a BPA-200 from a BrianGT Kit.

BPA-200 Schematic:

maxw · 15th April 2005, 05:10 AM

BrianGT schematic:

maxw · 15th April 2005, 05:13 AM

And here is how I see it (unless Im totally missing something

)

Use values from the BPA-200 schematic (first pic), Match them very close as suggested, lift R3 and R5 to add Ci caps (eg here) and bridge R6 and R7 on one BGT PCB:

digi01 · 15th April 2005, 08:16 AM

I recommend you connect 2 BGT4780 unit through drv134,it is very simple to bridge.I have test this way with 2 BGT 4780 plus my BLD driver,the amp really sing

digi01 · 15th April 2005, 08:33 AM

here is the connections,be careful physical balance in signal wiring from drv134 to 4780 should be maintained.

z

maxw · 15th April 2005, 07:29 PM

Quote:

Originally posted by digi01
here is the connections,be careful physical balance in signal wiring from drv134 to 4780 should be maintained.

z

Thank you digi01, that is how I will do it then

BrianGT · 15th April 2005, 09:57 PM

Quote:

Originally posted by maxw
And here is how I see it (unless Im totally missing something )

Use values from the BPA-200 schematic (first pic), Match them very close as suggested, lift R3 and R5 to add Ci caps (eg here) and bridge R6 and R7 on one BGT PCB:

This will not work, as you can't invert the input by swapping the input/ground connection for the inverted board. You will need to create a inversion circuit, or used a balanced driver chip like the DRV134.

Quote:

Originally posted by digi01
here is the connections,be careful physical balance in signal wiring from drv134 to 4780 should be maintained.

Exactly! It should work fine, and be similar to the Jeff Roland Concentra design.
http://www.jeffrowland.com/images/review16d2.jpg

--
Brian

BrianGT · 15th April 2005, 09:58 PM

Quote:

Originally posted by maxw
Thank you digi01, that is how I will do it then

If you need and extra digi01 board for the DRV134, I can send you one.

--
Brian

jleaman · 15th April 2005, 10:16 PM

Quote:

Originally posted by BrianGT

If you need and extra digi01 board for the DRV134, I can send you one.

--
Brian

You could send me 2 : O ) Please

maxw · 15th April 2005, 10:35 PM

Quote:

Originally posted by BrianGT

If you need and extra digi01 board for the DRV134, I can send you one.

--
Brian

Yes, thanks. I have a few things I my "BGT" shopping list, will email you later

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15th April 2005, 08:16 AM	#4
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	I recommend you connect 2 BGT4780 unit through drv134,it is very simple to bridge.I have test this way with 2 BGT 4780 plus my BLD driver,the amp really sing