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A voltage divider (two resistors in series) will achieve the required result. The value of the resistors will depend on what current is required to be supplied. It also matters what variation from 3V is allowed since taking current will make the voltage drop.

An electronics parts shop will sell components to make a more efficient system.

Or you could get 3 voltage regulators .. 9V then 5V then 3V in series .. that should keep the voltage stable as long as the 9V supply is

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13y ago

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