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Do you need to control it via a computer?
if not, 3x12V lead-acid batteries and one potentiometer would work.
Although personally I would use a single operational amplifier feed via a voltage reference instead, that way you can be sure that the voltage does not vary over time as the batteries are discharged.
Both circuits are very easy to build (the first one is just a single component+leads).
if not, 3x12V lead-acid batteries and one potentiometer would work.
Although personally I would use a single operational amplifier feed via a voltage reference instead, that way you can be sure that the voltage does not vary over time as the batteries are discharged.
Both circuits are very easy to build (the first one is just a single component+leads).