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Product specific power supplies

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daviddlc

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One of the issues I face when design projects, is to have a specific power supply.

For example, if my circuit will consume 5 volts and 20 mA, the lowest transformer for the power supply will be 5 volts and 100 mA. I haven't found any smaller transfomer

I would like to use a 5 volts and 30 mA transformer,

Do you know if there is a company that sells all kind of step down transformers ?

Switching power supplies probably are expensive for most of the projects I design
 

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