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Old 15th April 2005, 05:08 AM   #1
maxw is offline maxw  United Kingdom
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Question BPA-200 from BGT LM4780 kit?

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

BPA-200 Schematic:
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Old 15th April 2005, 05:10 AM   #2
maxw is offline maxw  United Kingdom
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BrianGT schematic:
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Old 15th April 2005, 05:13 AM   #3
maxw is offline maxw  United Kingdom
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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:
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Old 15th April 2005, 08:16 AM   #4
digi01 is offline digi01  China
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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
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Old 15th April 2005, 08:33 AM   #5
digi01 is offline digi01  China
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here is the connections,be careful physical balance in signal wiring from drv134 to 4780 should be maintained.

z
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Old 15th April 2005, 07:29 PM   #6
maxw is offline maxw  United Kingdom
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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
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Old 15th April 2005, 09:57 PM   #7
BrianGT is offline BrianGT  United States
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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

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Old 15th April 2005, 09:58 PM   #8
BrianGT is offline BrianGT  United States
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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.

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Old 15th April 2005, 10:16 PM   #9
jleaman is offline jleaman  Belgium
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Quote:
Originally posted by BrianGT


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

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You could send me 2 : O ) Please
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Old 15th April 2005, 10:35 PM   #10
maxw is offline maxw  United Kingdom
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Quote:
Originally posted by BrianGT


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

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