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Old 14th January 2006, 02:52 PM   #11
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nobody made this amp yet?
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Old 14th January 2006, 03:20 PM   #12
veteran is offline veteran  Poland
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Why not use a parallel configuration of two LM3886 or one LM4780 amp? No phase inversion needed and it can easily drive less then 8R speakers.

LM4780 stereo/parallel
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Old 14th January 2006, 03:51 PM   #13
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i need min 100W(max 200W) into 6-7ohm load(real values)
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Old 14th January 2006, 04:03 PM   #14
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Theoretically You should get 'real' 100W on 6R using this configuration of chip-amp. But if You wont more power - look for some discreet bipolar or mosfet amplifier.
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Old 14th January 2006, 04:05 PM   #15
XELB is offline XELB  Portugal
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Quote:
Originally posted by -_nando-_
NEVER drive loads bellow 8 Ohms with 3886 bridged !

I am driving 6 Ohms speakers with LM3886 bridged and they don't get very hot
My trafo is 20-0-20 .....


BTW, the LM3886 plays very well when it's hot
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Old 14th January 2006, 04:09 PM   #16
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Quote:
Originally posted by veteran
Theoretically You should get 'real' 100W on 6R using this configuration of chip-amp. But if You wont more power - look for some discreet bipolar or mosfet amplifier.
using +/-30V results 160Winto8Ohm load(using theOverture_Design_Guide13)
so i was hoping at least 120W
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Old 14th January 2006, 06:10 PM   #17
Bazukaz is offline Bazukaz  Lithuania
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Bridged amp will drive a load of 4 ohms , but the protection will not allow to reach the highest power levels.
To get 160 w RMS you will have to keep ur chip temperatores low.That means a large heatsink , and a fan. I think it is better to use 4 chips instead , and have 200 w RMS without a fan.
Did you read BPA - 200 app note ?
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Old 14th January 2006, 06:49 PM   #18
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i want to use just 2 chips,and i don`t intend to use 160W;100,at most 120W;although the speakers i`ll use are rated at 200W RMS
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Old 14th January 2006, 07:11 PM   #19
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So You don't have a choice Use both of them in parallel configuration.
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Old 14th January 2006, 07:37 PM   #20
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i only have 4 chips for a stereo amp,in paralel,they don`t give 100W/8ohm;i`ll stick with the bridge config;with a power supply of +/-30V
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