Does the transformer ratio 240:15 or 240:30? It's a bit confusing
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\$\begingroup\$ 15-0-15V. So you can get 30Vrms from it but the centre tap allows 15V as here. \$\endgroup\$– user16324Commented Mar 29, 2021 at 13:05
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It's 240:30 with secondary centre-tap.
You might find it specified as "primary 240 V, secondary 15-0-15 V" which gives a clearer idea of how the secondary is configured.
answered Mar 28, 2021 at 22:04