Power supply for Amp 48v

scorp8669 · 11th August 2008, 01:42 PM

Recently I built a 60w amplifier for my bass guitar from this website: http://www.uashem.com/pageid-13.html

The only thing that I can't finf is the power source for it: 48v

220V Primary, 48-50V Secondary 75 to 150VA Mains transformer

Please help me, is there anyway I can build one?

burbeck · 11th August 2008, 02:04 PM

hi there,
this is a common enough transformer, it maby that the specifications of this part that they give is misleading.

here is my interpretation of the spec

Primary to suit your local mains supply (they specify 220V) check this.

secondary 48 or 50Volts, 75 to 150 VA (i would use 150VA)

the secondary can be 2 windings of 24 or 50 Volts joined together in series.

Hope this helps

jackinnj · 11th August 2008, 02:24 PM

If it's 48V single ended you may get lucky and find a telecommunications switching supply surplus -- this is still pretty common -- and the ones I have are actually pretty quiet. This type of supply in the surplus market may be less than the cost of a transformer.

11th August 2008, 01:42 PM	#1
scorp8669 diyAudio Member Join Date: Aug 2008	Power supply for Amp 48v Recently I built a 60w amplifier for my bass guitar from this website: http://www.uashem.com/pageid-13.html The only thing that I can't finf is the power source for it: 48v 220V Primary, 48-50V Secondary 75 to 150VA Mains transformer Please help me, is there anyway I can build one?

11th August 2008, 02:04 PM	#2
burbeck diyAudio Member Join Date: Aug 2004 Location: Ratae Coritanorum	hi there, this is a common enough transformer, it maby that the specifications of this part that they give is misleading. here is my interpretation of the spec Primary to suit your local mains supply (they specify 220V) check this. secondary 48 or 50Volts, 75 to 150 VA (i would use 150VA) the secondary can be 2 windings of 24 or 50 Volts joined together in series. Hope this helps __________________ regards bob

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11th August 2008, 02:24 PM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	If it's 48V single ended you may get lucky and find a telecommunications switching supply surplus -- this is still pretty common -- and the ones I have are actually pretty quiet. This type of supply in the surplus market may be less than the cost of a transformer.

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