Above we see two circuits that operate as follows: If A is more positive than B then MOSFET Q1 will turn on and M1 ( motor1 ) will run. If B is more positive than A then MOSFET Q2 will turn on and M2 ( motor2 ) will run. The designer should select MOSFETs with a low turn-on resistance and a low gate turn on voltage. Note that these MOSFETs are being connected in the reverse fashion from what is normally expected. This reversal is to avoid having the instrinsic MOSFET body diode cause problems. The MOSFETs must be the N channel variety.
For low voltage turn-on ...... less than 1 volt .....
check out http://www.aldinc.com/ald_epadfaq.htm
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