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

One thing I have found and try to stay away from is running anymore voltage to the 5volt regulator than needed. Running 12volts into the 5 volt regulator creates alot of heat.

As far as your transistor setup your base resistors are way to high and should be based on the transistor specs. If you had a schematic so we could see what you are trying to do and would help. NPN transistors are for current sink(switching ground) and PNP transistors for switching positive voltages. The one thing you have to watch with a PNP transistor is the fact that there will be a postive voltage on the base and if you are running 12volts through the transistor you will end up with that voltage back at the SX this is a bad situation. It is always best to have positive trigger out of the SX to a NPN then to a PNP or just NPN only for current sink to the motor.

Kevin

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