Re: Home made AC-AC power supply question

In article <fifnd6$mmi$1@xxxxxxxxxxxxxxxxxxxxxxxxxx>,
"Clubsprint" <spamspamspamspam@xxxxxxxxxx> wrote:

What calculation do I use to work out the current requirements
on the primary? So if the seconday is 9vAC 2.5Amps how do I know
what the current rwequired for the 240Vac primary?

Volts * Amps = Volts * Amps (also equals Watts, but that's irrelevant
here)

So: 9 * 2.5 = 240 * X

so (9 * 2.5)/240 = X

so 22.5/240 = X

so 0.09375 = X but that's in Amps...

so about 94 milliamps, call it 100 or 125 mA (1/8 amp) to be on the safe
side (transformers are not 100% efficient).

Use a 1/4 amp fuse rated for 250V or more.

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