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You're right ejaf, a CRO (cathode ray oscilliscope) would be the best way to test and see the shape of the waveform you're putting out.
As for current into the TX IC. Well when the button is pushed, the pin on the TX goes to ground. So the output of the PWM needs only to go to ground to turn the IC "on" so to speak.
I was thinking of a transistor-coupled circuit using a pullup resistor on the IC pin but in the end I didn't need it. I just connected the output of the PWM to the input pin on the IC.
Currently the controller is running at approx 10Hz for the steeering. I'm working on the speed control as well, but this circuit will be running at a higher speed (possibly > 30Hz??) to reduce the "stepping" effects of motors at this speed and duty cycle.
ph2t.
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