MATH: My Achilles Tendon

Using Arduino General Electronics
2
  • 300mA@6V=1.8W, so any supply that can deliver 2 Watts or more should be fine (one pump at a time)
  • The only resistor you will need is to the base of the transistor. If your using the PN2222A then a 520 ohm resistor would do.
  • The PN2222A should be fine.