how to make cooling fan speed controller use BD139 transistor

speed control for cooling fan use BD139 transistor, maximum load of 800 milliamps can be given on this circuit. इस सर्किट पर अधिकतम 800 मिलीमीटर का load दिया जा सकता है।

10amps speed controller-

High voltage generator -

without BMS lithium battery -

wireless transmission circuit -

voltage regulator circuits -

speed control circuits -

amplifier circuits -
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