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How to read toroidal transformer label
How to read toroidal transformer label
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Old 25th April 2020, 03:47 PM   #1
cchean is offline cchean  United States
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Default How to read toroidal transformer label

Looking at a Holden and Fisher toroidal transformer, the label says "Rating 30". Its a 15-0-15V transformer, not to big and I was wondering whether the 30 means 30VA or 30 amps???
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Old 25th April 2020, 04:04 PM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
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You can tell by size of transformer.
It would be very big to pass 30 amps at 15 volts.
The rating is probably VA so 1A per winding max current.
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Old 25th April 2020, 04:20 PM   #3
cchean is offline cchean  United States
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Thanks Nigel. I thought the same. Your answer pretty much confirms what I suspected before.

I wonder whether it would be safe to use in circuits requiring more than 15V DC. I mean, after rectifying bridge, capacitors and all, if I build a regulated power supply.
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Old 25th April 2020, 07:59 PM   #4
nigelwright7557 is offline nigelwright7557  United Kingdom
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By the time it is rectified and smoothed it will be around 21 volts.
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