[sdiy] Power Supply Questions

[Harry Bissell]

VA rating of a transformer is usually thermal limited and assumes some typical voltage drop. In the case of a SMALL
transformer (like 30VA) the transformer regulation is poor (not much core there) and you should use the .83A rating.
Draw more and the transformer output voltage will probably drop (quickly), and become very non-sinusoidal.

For a transformer that small, cut-and-try is the way to go...

H^) harry


----- Original Message -----
From: Oscar Salas <osaiber at yahoo.es>
To: synth-diy at dropmix.xs4all.nl
Sent: Wed, 16 Mar 2011 12:55:20 -0400 (EDT)
Subject: [sdiy] Power Supply Questions

Hello,

In a 2X18 30VA transformer, so each secondary (15VA) is current rated 0.83A at 18V, how much current rated will be in each secondary after a regulator that provides 15V?

VA=V*A; VA/V=A; 15/15=A=1

It is 1A... or it can not be considered after the regulator and remains 0.83A?





      
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-- 
Harry Bissell & Nora Abdullah 4eva