You would know that i tried to make a diy pic programmer and failed because i dont know a lot about transistors and other then simple digital stuff (microcontrollers) and i would need help to make a very simple circuit to control a 3 amps motor trough one 1/0 of a 16f628a.
As the input/output can only source out 25 mA, do i need 2 transistors(one small signal of unknow serie and a tip31c power transistor) to be able to run the dc motor?
1)What would be a very simple design to completly source the dc motor with the 1/0 pin?
2) What would be a good small signal npn transistor?Can you give me a little list so i can search it on my surplus store website ,because the transistor are not classified there so its hard to find if you dont know.