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It looks like you got the help you need, but for future reference:
1. You can use a resistor network to lower the voltage of a source. However, you need to be careful of the amount of current that you need at the lower voltage.
2. You can also buy DC-DC converters that can either step up or step down a DC voltage.
3. Instead of a relay, you may also be able to use a transistor. They can switch large amounts of current with a low input voltage and very low input current.
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