I'll catch you all up a bit.

I have changed tack.

I am trying to go from a hobby level car with PWM controls to a toy level car most of which have simple DC wheel and servo controls. The purpose is to reduce the cost of kitting for school students. In addition to reducing the cost, DC control of two wheel drive makes it easier to implement a sporty racing-like skid steering.

I purchased (at K-MART) two 1/10 scale toy cars on sale each for $25.95. Their original prices were $50. The 1/10 size gives me more room for adding microchip electronics. The wheels and the steering if driven simply by DC with reversing current are easily controlled using DPDT relays controlled via current drivers by my PIC .

WRONG! The steering servo contains both a DC motor and an angle measuring device which is read by the electronics that comes with the car. A total of six wires go to this servo. Where can I read how this works? Should I just go back to the store and buy 'proper' toy level cars? Your suggestions would be greatly appreciated.

Thank you thank you for the oscilloscope. Without it I would not have the faintest.

Ken