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I have some musical devices brought from Europe that I would like to convert. I'm tired of having those step-up boxes for each device. I'd like to simply convert once and for all.

The transformer probably are from 220v AC -> 9v DC (or 12v) I noticed that when I plug them in in my 110v outlet they don't work well.

What is the best way to do this?

Should I buy just a new transformer? (I would like to avoid this because these devices are vintage)

Should I add a DC booster? so in case i want to return to original configuration i can sell them in europe?

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  • \$\begingroup\$ Do these things have internal or external power supplies? \$\endgroup\$ – alex.forencich Nov 2 '13 at 3:18
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    \$\begingroup\$ I would get new external power supplies, as the "vintage" ones may have safety or ageing issues. Just store the original supply for later resale. \$\endgroup\$ – pjc50 Dec 2 '13 at 9:54
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From the description in the question, the musical devices use individual external power adapters aka wall warts. The statement "probably are from 220v AC -> 9v DC (or 12v)" is not definitive enough to go on.

The recommendation is to measure the voltages at the connectors going into each musical device, determining both voltage, and whether it is DC or AC. Assuming they all use DC is not valid, many devices are powered by low voltage AC from a small wall transformer. Also, the power adapters supplying the musical devices probably have markings indicating their input (110, 220 or universal AC) and output (5, 6, 9, 12 etc Volts, and DC or AC).

Then, simply replace each of the power converters for the DC devices, with "universal" wall warts of the correct DC output voltages. Universal = They work across the entire range of mains voltages, 100-250 VAC being common.

For the devices that receive an AC input, say 9 or 12 VAC, replace their existing transformers with transformers with the same rated output voltage and current in each case, but designed for 110 VAC mains.

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