Turning on a motor using a transistor (question)
December 27, 2011
I'm building a fire-fighting robot for a science expo and everything is fine so far (at least the electronic part is!) but I`m stuck with the fan motor. I`ve already fried a N3906 (don`t know what I expected).
I want to turn on/off a dc motor that uses 1.5A at 3V. The best transistor (2N5550 transistors) I could find at home can only deliver 0.600A. What can I do apart from buying another transistor (I'm broke lol)? Can I sort of connect 3 of those in parallel and have them share the same Base or add a huge heatsink? By the way do I need to limit the current flowing towards Base? How do I calculate the resistor values if I need to limit the current flowing to base?
Thanks a lot LMR!