Hi ya'll just wondering does the parallax board has a built in regulator in it or do we still have to put in a regulator?, also what is the voltage limit of the board?
Depends on the board. Some have linear regulators, and those have voltage limits around 9V (+ or - a few volts depending on current draw). Boards with switching regulators can handle input voltages in the 5 to 16V range. The DIP modules need a regulated 3.3V or 5V input depending on which module.
shows a LM2936. This is a 5 volt regulator to provide VDD (5 volts) to the board. Anywhere on the board that you can access VDD, that will be a regulated 5 volts.
The input on the board shows 6 Volts. Since this is the voltage used by the Servos, (VIN), you shouldn't go any higher, or else you will burn out the servos.
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http://www.parallax.com/sites/default/files/downloads/27400-SumoBot-Manual-v2.1.pdf
shows a LM2936. This is a 5 volt regulator to provide VDD (5 volts) to the board. Anywhere on the board that you can access VDD, that will be a regulated 5 volts.
The input on the board shows 6 Volts. Since this is the voltage used by the Servos, (VIN), you shouldn't go any higher, or else you will burn out the servos.