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http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1231328526/0#0
If they are in parrallel, you should only get a small decrease in speed, accounting for losses and things. If they are in series, then you'll get a big decrease in speed.
Operating voltage 1.5VDC to 3VDC. At 1.5VDC no load output is 9100RPM at 200mA, stall torque is 26g-cm (0.36oz-in) at 2.2A and maximum efficiency output is 6990RPM delivering 6g-cm (0.08oz-in) torque while drawing 660mA current.
http://itp.nyu.edu/physcomp/Labs/DCMotorControl
@jkerns: The information of the DC motor Quote Operating voltage 1.5VDC to 3VDC. At 1.5VDC no load output is 9100RPM at 200mA, stall torque is 26g-cm (0.36oz-in) at 2.2A and maximum efficiency output is 6990RPM delivering 6g-cm (0.08oz-in) torque while drawing 660mA current.. - Could I have a external battery of 9V for the 2 motors at the same time? I don't know exactly how the two motors share the external battery power, because I saw in the H-bridge schematic at Quotehttp://itp.nyu.edu/physcomp/Labs/DCMotorControl, it has one Motor external power supply, and if I use, let's say 4.5V external battery? How many volts does it motor get?- In the H-bridge, I understand that we have to use the diode to have the current flow only from one direction in order for the current not to flow reverse into the board when the DC motor begins to stop. However, is it the problem at the 3V, 4.5V or 9V supply that gives damage to the Arduino board or the problem is from the "reverse current" that goes from the other side into the Arduino board?
http://www.ti.com/lit/ds/symlink/sn754410.pdf
http://www.societyofrobots.com/schematics_h-bridgedes.shtml