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I have two 12V motors (300 RPM) running from a L293D H-bridge circuit. I find that the speed when I provide 12V is not satisfactory. Will it damage the 12V motors if I provide 18V or 24V? Will they go at higher RPM at higher voltage? The L293D circuit has maximum rating of 36V anyway.

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    \$\begingroup\$ Are you putting the motors in series now? \$\endgroup\$ – Matt Young Jun 30 '14 at 13:02
  • \$\begingroup\$ It really depends on what current you are running through the motors. See this, it should explain electronics.stackexchange.com/questions/108686/… I know it's for lower voltages but the same problem applies on 12 volt motors if you are taking a a few hundred milli amps - the chip will perform unsatisfactorily and burn usually. \$\endgroup\$ – Andy aka Jun 30 '14 at 17:30
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enter image description here

The datasheet for your selected H-Bridge indicates a maximum amperage of 600mA per channel. It seems like this should be enough for your 12v motor. (whats the model number of the motor?)

So this could mean that your power supply is the problem. You are thinking about raising voltage: enter image description here

But unless I misunderstand, what you need to do is this: enter image description here

Unless of course one of your motors draws more than 600mA then you need a different H-Bridge

References: battery images credit goes to http://www.zbattery.com/. Texas Instruments datasheet http://www.ti.com/lit/ds/symlink/l293d.pdf

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