So I have two transistors hooked up in parallel acting as switches to two dc mot
ID: 1811689 • Letter: S
Question
So I have two transistors hooked up in parallel acting as switches to two dc motors. I have lines running to the bases off of my microcontroller but i was tinkering with them the other and noticed something that I couldn't explain. I unhooked one of the base lines and was testing the other one by running the motor, but by moving the unhooked motor just a little bit the motor began to run without the base line hooked in. So both motors were running while only one base was hooked up. I'll include a picture of my circuit,but it would be great if someone could explain what is going on. From my understanding of transistors, no current can pass if there is not base signal, but perhaps having the transistors hooked in parallel is having something to do with it. Any suggetions/explanations would be greatly appreciated. Thank you in advance.
Explanation / Answer
when base is open :: there is a little current called reverse saturaion current flow in transistor form collector to base . this current is due to minority carrier diffusion ....
due to this current motor is runing ....
value of this current is very small .
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