I'm working on a circuit to control a small dc motor with momentary push button controls to control the volume on my audio system. I found the following circuit and laid it out in Eagle to interface into my motorized pots:
Now, this circuit is designed for a 12v dc motor drawing 1 amp max at load, but is only drawing about 100mA in this setup. My motors are 3v drawing 100mA. Two questions:
1. I know I don't need the TIP31 but will they work with my smaller voltage?
2. If I were to look at my requirements for power and voltage, how does one go about selecting an appropriate NPN transistor?
I understand the concept of the NPN but I just haven't quite wrapped my head around how to pick one.
Thanks
Jay
Now, this circuit is designed for a 12v dc motor drawing 1 amp max at load, but is only drawing about 100mA in this setup. My motors are 3v drawing 100mA. Two questions:
1. I know I don't need the TIP31 but will they work with my smaller voltage?
2. If I were to look at my requirements for power and voltage, how does one go about selecting an appropriate NPN transistor?
I understand the concept of the NPN but I just haven't quite wrapped my head around how to pick one.
Thanks
Jay
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