Starting a 12 Volt cooler from any voltage

Hi all. Today I will tell you how to connect a twelve-volt fan to any voltage. The whole secret lies in choosing a quenching resistor. It will “extinguish” excess stress. To find the resistance of this resistor you need to do simple calculations.
This method is very simple and does not require any stabilizers or microcircuits. With it you can power absolutely any fans from a higher voltage.
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