What would happen with a 45V transformer???

camshaft · 27th February 2007, 07:56 AM

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?

http://cgi.ebay.com/TOROID-TRANSFORM...QQcmdZViewItem

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,
Austin

digi01 · 27th February 2007, 08:21 AM

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

Z

boholm · 27th February 2007, 01:26 PM

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 . . . ?

camshaft · 27th February 2007, 06:04 PM

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.

Austin

27th February 2007, 07:56 AM	#1
camshaft diyAudio Member Join Date: Dec 2006	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? http://cgi.ebay.com/TOROID-TRANSFORM...QQcmdZViewItem 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, Austin

27th February 2007, 08:21 AM	#2
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	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 Z __________________ 2010 DIY ALBUM UPDATED UCPv1(preamp) & DUAL(power supply)

27th February 2007, 01:26 PM	#3
boholm diyAudio Member Join Date: Apr 2004 Location: Copenhagen	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 Bo

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27th February 2007, 06:04 PM	#4
camshaft diyAudio Member Join Date: Dec 2006	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. Austin

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