Let's Make Robots!

having trouble with power supply.

Hi,

I have used a 40 x2 picaxe IC. My line follower has that,  L7805 voltage regulator , and  the IC L193D motor driver. I`m using 2 300rpm motors and 3 sensors.

My problem is , even though i gave a power supply of 18v, the power is not enough to drive the motors as well as activate the sensors. I can`t use a higher voltage supply because it will burn the picaxe IC.

Help? :S