AC Transformer 18V-0-18V 1000mA Center-Tapped 220VAC Input
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Prices updated: 13 Oct 2026
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About this product
A 220 VAC mains step-down transformer with a center-tapped secondary rated 18V-0-18V at 1000 mA. It suits linear power supply projects and DIY circuits that need a dual-polarity supply after rectification and regulation. Mains wiring is dangerous, so use proper insulation and enclosure.
Specifications
- Input voltage
- 220 VAC
- Output voltage
- 18V-0-18V (center-tapped)
- Rated current
- 1000 mA (1 A)
- Typical application
- Linear power supply projects
Frequently asked questions
How do I get a ±18V DC supply from this transformer?
Use a full-wave bridge rectifier with the center tap as 0 V, then add filter capacitors and regulators. Unregulated peaks on each side are roughly 25 V under light load, so choose capacitors and regulators rated above that.
Should the center tap be connected to ground?
Yes. In a dual-supply circuit the center tap is the 0 V reference, so it is normally connected to the circuit ground that the positive and negative rails are measured from.
