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DIY For Audio
Power supply, help please?
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<blockquote data-quote="JimGore" data-source="post: 463399" data-attributes="member: 3"><p>Your voltage sounds about right for that transformer with no load on it.</p><p></p><p>15VAC / 0.707 = 21.21VDC minus between 0.6 and 3V for the diode drop in the bridge.</p><p></p><p>It will probably go down a bit when you load it tho. You may want to use something like a 18V secondary transformer if the amp wants higher rails.</p><p></p><p>Also, if your amplifier is class A then you will want a bit higher VA rating for the current supply which will also have less rail sag under load.</p><p></p><p>Cheers,</p><p>Ian.</p></blockquote><p></p>
[QUOTE="JimGore, post: 463399, member: 3"] Your voltage sounds about right for that transformer with no load on it. 15VAC / 0.707 = 21.21VDC minus between 0.6 and 3V for the diode drop in the bridge. It will probably go down a bit when you load it tho. You may want to use something like a 18V secondary transformer if the amp wants higher rails. Also, if your amplifier is class A then you will want a bit higher VA rating for the current supply which will also have less rail sag under load. Cheers, Ian. [/QUOTE]
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DIY & Tutorials
DIY For Audio
Power supply, help please?
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