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Old 13th February 2003, 07:33 PM   #1
rdunnit is offline rdunnit  United States
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Default Lm3886 (bpa-200)

I was wondering if anyone has built the bridge-parallel amplifier (BPA-200) that is on the National Semiconductor website. I was curious also as what voltage should the mute pin have applied to it. I have been reading a lot on here and other sources and I am ready to build an amplifier system. I was wanting to build the BPA-200 for subwoofer and then use 4 minimized gainclone amplifiers in a bi-amp configuration. So effectively I would have a tri-way system utilizing an electronic crossover design that I would build. Any help on the BPA-200 would be appreciated!

Thanks!!!
Robert


http://www.national.com/an/AN/AN-1192.pdf
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Old 14th February 2003, 02:49 AM   #2
rdunnit is offline rdunnit  United States
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Has anyone had much success with the LM3886? I did a search and found where people had used the IC's before but could not find out much info about what resistor value (ie voltage value)should be on the mute pin. Any help would be appreciated.
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Old 14th February 2003, 03:17 AM   #3
Hamish is offline Hamish  Australia
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there is info on the voltage around here somewhere....i just can't remember where. try ampchip diy forum if you can't find it here. or then again, check the data sheet at national. those datasheets are full of useful info like that
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Old 14th February 2003, 07:40 AM   #4
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I am playing with some LM3886. Currently I'm using 1k between - and mute. I've also tried with 3k ohm both works fine with +-25v rails.


The datasheet states that if you draw 0.5 ma or more from the mute pin then the mute is disabled.
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Old 14th February 2003, 08:20 AM   #5
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du er bare go'...........
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Old 14th February 2003, 08:41 AM   #6
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I'm even using 47 kOhm between mute and -, and it works fine.

/Chris
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Old 14th February 2003, 04:45 PM   #7
rdunnit is offline rdunnit  United States
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Thanks alot for all of your help. It will help me out immensely.
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Old 14th February 2003, 05:46 PM   #8
JohnG is offline JohnG  United States
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Please look at this thread for a lot of info:

LM3886 Parallel Use
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