Is it possible to use an NPN transistor to control a 5V power supply from Arduino


Posted on Feb 6, 2014

The emitter is always going to be a few hundred milli volts behind the base voltage (in this type of configuration) and as the base voltage is 5V, depending on how much current is taken by the `switched` circuit` on the emitter, it is more likely to be 4. 5V despite the collector being at 5V. However, if you used a PNP transistor with the emitter b


Is it possible to use an NPN transistor to control a 5V power supply from Arduino
Click here to download the full size of the above Circuit.

eing fed by the 5V there is a fairly good chance that you can attain 5V (less maybe 10 or 20 millivolts) on the collector (load side) without much hassle. Better still use a P channel FET because this will do a slightly better job (maybe only a couple of millivolts "lost") and it can be fed directly from a 5V logic supply to its gate. Source will connect to incoming 5V and output will be on drain.




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