In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mgreen wrote:

1) Motors are inherently very noisy and electrical noise gets into other parts of the circuit.  If you want specific suggestions, you'll have to post a schematic of the setup you have.  Make sure the schematic is of what you actually have, not what you think you have.  They're sometimes different.

2) The 9V limitation is mostly due to heat considerations.  If your circuit draws any appreciable amount of current from the regulator, all that extra voltage becomes heat and the regulator will shut itself down to prevent damage from excessive heat.

3) Never just add a larger power supply or change the capacitors or regulator unless you first understand what's going on.  You may find that there's a simpler solution and the changes you mentioned may not fix the problem and may even damage things.  The last thing you want to do is to try a solution that involves cheap parts and end up damaging the expensive parts.

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