How to get 18V AC out from 12V DC with a circuit - Quora
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5V, 6V, 9V, 8V, 10V, 12V, 15V, 18V, 24V-1A Regulators using 78xx series | ElecCircuit.com
Electrical & Electronic Circuit - AC (12-18)volt to DC 12v Battery charger circuit diagram | Facebook
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M78-79S Single AC Transformer To Dual Regulated 12/15/18Vdc Module.Perfect Solution For DIY - Motronix