I am building a model warship that needs 12 volts and 5 volts to run its motors and a microcontroller. The ship is powered by two 12 volt lead acid batteries wired in parallel. I built a power board that, among other things, splits the battery between power out (which will connect directly to the motor controllers) and a LM7805 volt regulator. I am worried that when the motors (three total) are run at the same time, this will cause a power drop below the regulator's usable threshold. Is there a way to ensure the regulator receives enough power?

here is a link to a circuit diagram, the part I discribed above is in the dashed box: http://imgur.com/t06mzzB

I am building a model warship that needs 12 volts and 5 volts to run its motors and a microcontroller. The ship is powered by two 12 volt lead acid batteries wired in parallel. I built a power board that, among other things, splits the battery between power out (which will connect directly to the motor controllers) and a LM7805 volt regulator. I am worried that when the motors (three total) are run at the same time, this will cause a power drop below the regulator's usable threshold. Is there a way to ensure the regulator receives enough power?