What would happen with a 45V transformer??? - diyAudio
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Old 27th February 2007, 07:56 AM   #1
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Default What would happen with a 45V transformer???

Hey guys,
I'm looking around for a transformer to build my first lm3886 amp, but since I'm not in a rush I just keep waiting around hoping a nice deal will pop up sometime. So right now there's a 45V toroid on ebay with a current bid of $10. I know this voltage is higher than what's normally used, but what would actually happen by using that high of a voltage. I'm assuming the actually chip could handle it since I think it's rated max is like 85V, but what about the sound?


Although by my luck I'm sure just by posting this here a bunch of people from the forum will bid it up, but whatever...

Thanks guys,
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Old 27th February 2007, 08:21 AM   #2
digi01 is offline digi01  China
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single 45VAC?I believe it is ok for LM3886.it's rated should approach to 45*1.2=54VDC.
you may use it build a OTL amp

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Old 27th February 2007, 01:26 PM   #3
boholm is offline boholm  Denmark
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It saya "Tandem", so I take as meaning 2 x 45 V AC out on secondary.

Which is too much for the LM 3886: 2 x 45V x 1,4 = 126 V.

Taken from datasheet:
Supply Voltage |V+|+|V−| (No Signal) 94V
Supply Voltage |V+|+|V−| (Input Signal) 84V

Unless - of course - you put in a regulated power supply too . . . ?
Best regards
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Old 27th February 2007, 06:04 PM   #4
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Thanks guys. When I saw max of 84V on the datasheet, I was thinking + and - 84V, not a combined max of 84V as boholm pointed out.

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