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Originally Posted by Rickertsen2
The control signal is very simple. All you need to do is supply it with the necessary voltage on the power lines and a 1-2 ms pulse periodically on the signal line. 1ms corresponds to full rev while 1.5ms is neutral and 2 is full forward.
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That is correct for an R/C servo, but incorrect for a Victor or similar PWM motor control.
For a PWM motor control, the duty cycle of the signal varies from 0% to 100%, corresponding to full reverse and full forward, respectively, with 50% being neutral.
[EDIT:] I stand corrected, the Victor uses standard R/C type PWM control, which operates as described in the quote above. The circuit I have won't work here, but there was a circuit in SERVO (or maybe Nuts & Volts?) earlier this year that had such a circuit using a 556. When I find that I will post a reference to it. [/EDIT:]
I have a circuit somewhere that does exactly what he wants, uses a single 555 and a few passive components, and varies from about 3% ro 97% duty cycle. I'll post it when I find it.
Don