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+12V Voltage Doubler

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This circuit was originally designed to operate a 15 volt regulator from an unregulated 12 volt AC adapter, but can be used for whenever you need more than 12 volts from a 12 volt supply. Iím posting it because one reader built a 12 volt DC to AC converter that I had posted and noticed that he did not get 12VAC out. That isnít possible with 12 volts input to that circuit because the peak voltage needed would be 17 volts. This circuit will solve that problem.

D2 and D3 may be 1N4004 or better. Schottky barrier diodes will raise the output voltage by a volt or so. This circuit is not regulated. You will get twice the input voltage minus about 2 volts, depending on load. This circuit worked well delivering about 250ma in a prototype to a commercial product I developed. A more appropriate transformer was used in production, eliminating the need for this converter.

Click on Schematic to view PDF
+12Volt Voltage Doubler


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