Lastly, would I even NEED an H-bridge to make motors JUST move forward like in a line following robot?
Quote from: polishdude20 on Mar 08, 2011, 08:04 amLastly, would I even NEED an H-bridge to make motors JUST move forward like in a line following robot?You only want an h-bridge if you intend to reverse the direction of the motor; if you don't need this ability, then a simple NPN transistor or N-channel mosfet (plus a diode, and maybe a resistor) is all that would be needed.
Motors take more current than a 2N3906 can easily provide. You want a medium power transistor (current rating several amps).BTW people often mistake absolute maximum ratings for working values. A transistor with a max current rating of 0.5A might saturate at 1.5V drawing max current due to stray resistance, rather than the nominal 0.1V of a saturated transistor in its 'comfort zone'.You can parallel several identical transistors for more current if they each have their own base resistor.