Quote:
Originally posted by Project RC
I did exact thing as the diagram describes, but it doesn't work. How do I test it? I don't want to blow my pcb. What is the best way to test the set up without soldering it to the pcb? Help. 
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I would double check all the connections make sure your transistor is in the correct position. Download the specs by doing a search on "2N2222A" also those that have a metal cap, like the one I used, the cap is actually connected to one of the legs(collector) pin so make sure you don't touch the cap to any of the circuit.
The easiest way to test is to use a 1.5v battery (AA AAA etc.) instead of the PCB. By connecting the battery where the PBC would connect the motor should turn.
Oh I noticed than the colors an the diagram could be a little misleading, the 4.5v battery (+) is connected to the motor and (-) is connected to the transistor and to the negative on the PCB
I recommend testing the circuit this way before putting it on the car.