How about using just one 7.4v battery and that LM317 between the 7.4v and the L293D Vcc2 pin ?? Why did u suggest two ?
Yep. You are making a mountain out of molehill. The only problem you will have is getting the heat out of the L293....
EDIT: I looked at the graph you sent and a motor with internal resistance of 30Ω will receive around 5.75v ? With a 7.4v battery ?
There are voltages and currents in the motor table. I dont have a Spice model of a motor (actually too lazy to build one) so it was easier to model the motor as a resistor. Actually, as the motor load changes, as the rpm changes, the effective motor resistance (ratio of motor voltage to motor current) changes all over the map.It will be open air, i think it will suffice... I wonder why there arent resistance values for the motors in the data charts, is it variable ?
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