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Sometimes it is necessary to control more than 40 mA from the arduino.In this case a MOSFET or transistor can be used to switch higher current loads .In this video an example of this application is created by quickly turning 'ON' and 'OFF'the MOSFET 5 times every second.

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More by videohelp4u:How to create and register bower package Basic electronics circuit schematic for full-wave bridge rectifier with diodes. How to switch higher current load that quickly turns on and off LED using MOSFET in arduino. 
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