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I want to make a variable VAC power supply, maybe using 3-5A transformer. I provide the simple circuit diagram below.

220 VAC to Variable VAC

What should I add to ensure its safety? Thank you.

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  • \$\begingroup\$ How about a fuse? \$\endgroup\$ – jwh20 Feb 23 at 23:36
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    \$\begingroup\$ Fuses on both sides. Switch to be break before make to prevent shorting the windings during switching. \$\endgroup\$ – Transistor Feb 23 at 23:37

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