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Old 11th August 2008, 01:42 PM   #1
diyAudio Member
Join Date: Aug 2008
Default 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?
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Old 11th August 2008, 02:04 PM   #2
burbeck is offline burbeck  United Kingdom
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
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Old 11th August 2008, 02:24 PM   #3
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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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