Lm3886 Bpa - Page 3

thomasfw · 24th April 2005, 03:46 PM

Quote:

It go bewteen the + signal input and ground. I connect two of the pin of the trimpot together,that is connect to + signal input and the remaining pin is connected to ground. This is for inverted mode amp.

Would You please post the schematic !

Many thanks !

Thomas

jaudio · 24th April 2005, 08:13 PM

Here a schematic

jaudio · 24th April 2005, 08:49 PM

The trimmer value should be the same as feedback resistor in this case 470k. If you cant find a 470k trimmer,500k will do.

thomasfw · 25th April 2005, 03:50 AM

Thank You For Your Post !

Do you think the Rowland M12 is use invert connection
for all LM3886 and use DRV134 at the front ?

Thomas

jaudio · 25th April 2005, 11:08 AM

Your welcome

I dont know about the M12 but if it has the lm3886 and a trimmer more than like it's inverted.

I do know that the concentra is inverted and uses the drv134.

I think M12 uses more lm3886 and is monoblock.

jaudio · 25th April 2005, 11:36 AM

Here a picture of my ver.

jaudio · 25th April 2005, 11:38 AM

wired up

jaudio · 25th April 2005, 11:41 AM

Dc offset

thomasfw · 25th April 2005, 11:59 AM

Quote:

I do know that the concentra is inverted and uses the drv134.

Do you know they add "Buffer OP" in front of "DRV134" or after it ?

How do you calculate the feedback R (470k/16k) in your ver. ?
As shown in BPA 200 document, thet are (21.5K/1K).

Thanks !

Thomas

jaudio · 25th April 2005, 12:56 PM

Your welcome

I dont know if concentra uses buffer in front of drv134.

I have the gain 13 on the (+) side and 13 on the (-) that adds up the 26.

The example I post was just an example.

If you use bridged parallel, you must use a lower gain than normal because both side adds up.

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24th April 2005, 08:49 PM	#23
jaudio diyAudio Member Join Date: Oct 2004	The trimmer value should be the same as feedback resistor in this case 470k. If you cant find a 470k trimmer,500k will do.

25th April 2005, 03:50 AM	#24
thomasfw diyAudio Member Join Date: Jan 2005 Location: Hong Kong	Thank You For Your Post ! Do you think the Rowland M12 is use invert connection for all LM3886 and use DRV134 at the front ? Thomas

25th April 2005, 11:08 AM	#25
jaudio diyAudio Member Join Date: Oct 2004	Your welcome I dont know about the M12 but if it has the lm3886 and a trimmer more than like it's inverted. I do know that the concentra is inverted and uses the drv134. I think M12 uses more lm3886 and is monoblock.

25th April 2005, 12:56 PM	#30
jaudio diyAudio Member Join Date: Oct 2004	Your welcome I dont know if concentra uses buffer in front of drv134. I have the gain 13 on the (+) side and 13 on the (-) that adds up the 26. The example I post was just an example. If you use bridged parallel, you must use a lower gain than normal because both side adds up.

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