I'm getting confused (was:"Power supplies: Sorry to be a pain, but I need more help!")

Hi again.....

I'm working through the design of my TDA1514-based power amp. I've been 
looking at http://www.dckits.com/app1.htm, and the author states that the 
power supply should be able to deliver 5 Amps. That seems an awful lot. 
Especially since I want to supply 5 amplifier circuits - meaning I need 
to supply 25A total.

I need +/- 23v or +/- 27.5v depending on the impedence of the speaker 
used.

I saw a circuit for a power supply which uses a step-down transformer 
with a centre-tap. Using this, I would have a 60vac transformer, through 
a rectifier which would give me +30v, 0v (from centre-tap) and -30v. 
There is an electrolytic capacitor between the +ve and 0v rails and 
between the -ve and 0v rails.

I then intend to use adjustable voltage regulators to give me 23 or 27.5v 
rails accordingly.

Am I right in thinking that the transformer's rating needs to be 1500VA 
(60x25)? This seems like enough to heat my house.

I have searched and searched on the internet, but noone seems to provide 
a generic circuit diagram for a power supply with a table of component 
values (or a formula) that I can use to provide the +ve and -ve supplies 
required by an ap-amp.

-- 
Regards,
       Dave

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