Can someone explain this tranformer?

dvdwmth · 9th September 2004, 04:25 AM

I am reposting this from another thread because its important I get this question answered before I carry on with my project.

I had mistakenly been using an over powered transformer in my last project and I'm now building an lm3876 Amp that I need a new power supply for.

I went to the surplus store and spotted a couple of 24V 75VA transformers and figured they'd do the trick.

I've just unpacked them and now I see there are three primary wires

. They are labelled:

120 V 1-------------)
95 V 2-------------)
0 V 3-------------)

the label says

PRI 95/120, 60Hz
SEC 24V, 75VA

So why are there three primaries. Im hoping that this is a supply for EITHER 95V or 120V and that I can just connect the appropriate wire, but I'm not going to assume that.

Can I use this thing or do I have to go buy yet another pair or transformers.

phase_accurate · 9th September 2004, 05:19 AM

It is exactly how you assumed: You'll have to connect 3 and 2 for 95 Volts or 3 and 1 vor 120 Valts and you'll be happy !

Regards

Charles

BTW: Where, for heaven's sake, is 95 Volts used ?

runebivrin · 9th September 2004, 06:04 AM

Quote:

Originally posted by phase_accurate
BTW: Where, for heaven's sake, is 95 Volts used ?

On the far end of a really bad power distribution line?

Rune

JojoD818 · 9th September 2004, 06:09 AM

Your replies make me laugh literally.

dvdwmth · 9th September 2004, 07:33 AM

Thats a relief.

Im started to collect a bit of a pile of transformers that didn't work out for some reason or another.

I wondered exactly the same thing about the 95V.

phase_accurate · 9th September 2004, 08:03 AM

The answer from our friend from the Philipines leads to the assumption that mains voltages below 100 volts are (unintentionally ?) used there.

Regards

Charles

9th September 2004, 04:25 AM	#1
dvdwmth diyAudio Member Join Date: Apr 2004 Location: Toronto	Can someone explain this tranformer? I am reposting this from another thread because its important I get this question answered before I carry on with my project. I had mistakenly been using an over powered transformer in my last project and I'm now building an lm3876 Amp that I need a new power supply for. I went to the surplus store and spotted a couple of 24V 75VA transformers and figured they'd do the trick. I've just unpacked them and now I see there are three primary wires . They are labelled: 120 V 1-------------) 95 V 2-------------) 0 V 3-------------) the label says PRI 95/120, 60Hz SEC 24V, 75VA So why are there three primaries. Im hoping that this is a supply for EITHER 95V or 120V and that I can just connect the appropriate wire, but I'm not going to assume that. Can I use this thing or do I have to go buy yet another pair or transformers.

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9th September 2004, 05:19 AM	#2
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	It is exactly how you assumed: You'll have to connect 3 and 2 for 95 Volts or 3 and 1 vor 120 Valts and you'll be happy ! Regards Charles BTW: Where, for heaven's sake, is 95 Volts used ?

9th September 2004, 06:09 AM	#4
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: diyAudio Special Operations Center	Your replies make me laugh literally.

9th September 2004, 07:33 AM	#5
dvdwmth diyAudio Member Join Date: Apr 2004 Location: Toronto	Thats a relief. Im started to collect a bit of a pile of transformers that didn't work out for some reason or another. I wondered exactly the same thing about the 95V.

9th September 2004, 08:03 AM	#6
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	The answer from our friend from the Philipines leads to the assumption that mains voltages below 100 volts are (unintentionally ?) used there. Regards Charles

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