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Old 3rd March 2007, 03:22 AM   #1
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Default Recommended Power Supply (3886)

Hey guys i will mount an 5 channels amp for my PC using LM3886, i want to know which are the best transformer that i can purchase, how much VA and How much Volts/rail, i need to power up an PCB with 5 Lm3886
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Old 3rd March 2007, 06:09 AM   #2
Arx is offline Arx  Canada
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Search around and see what everyone else is using for voltage with those chips. You would use the same voltage as on a stereo amp. You could probably cheat and look at one of the manuals from one of the sites that sells 3886 kits

As for VA rating, Ideally you would want 5 times the size as well, but in reality you probably won't be playing maximum output on all 5 channels at the same time, and most people tend to oversize their transformers a lot to begin with, so you can probably go a little smaller.

I'm building a 6 channel 3875 for tri-amping (tweeter, woofer, sub) and am using a 600VA transformer. I expect it to be tons more than I need.

As for where to buy from, I got mine from an ebay store, so I can't really make any suggestions there. if you search for toroid transformer, you'll see the place right away. It'll be the vast majority of the listings.

I haven't used it enough to comment on the quality, but it looks reasonable, and has been hum free, the small amount that I've played with it.

-Nick
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Old 3rd March 2007, 09:51 PM   #3
sek is offline sek  Germany
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Others and me replied in the other thread, no need to open up another one. You ask the exact same question in two different threads.

As Arx also pointed out, there's a lot about it that can be found by searching.
Don't get me wrong, I know searching takes time. But what does it take repliers to answer to questions that haven't been researched first? Right, their time...
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Old 5th March 2007, 01:38 PM   #4
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ok, already ordered the transformers, now need to know how much uf i need in my PSU.

4700UF X 50V caps are ok ? i can get these caps at 2 USD/pc (purchasing 500 pcs)
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Old 6th March 2007, 01:59 AM   #5
Arx is offline Arx  Canada
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Sure, that'll work. Those chips aren't too picky.

-Nick
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