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Originally Posted by sparksandtabs
so a MOSFET is like the same thing but only, i guess you would say safer?
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Not exactly, MOSFETs and bipolars each have their uses. They work in slightly differnet ways that would suite different applications. In some applications, you would need to use bipolars because MOSFETs won't work and vice versa. For a high powered motor controller, I think the MOSFETs would be best.
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Originally Posted by sparksandtabs
what kind of chips or what different chips can I use to interpret the pwm signal for forward and reverse and the correct duty cycles and all that?
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It would depend on what your final application would be. I don't remember the manufaturer/part# off the top of my head, but there's a chip to control a MOSFET h-bridge (there's some subtle timing/voltage issues that need to be taken care of). That specific chip doesn't do any PWM though. For that, you'd probably have to use a PIC (possibly in conjunction with this h-bridge controller). I don't know of any commercial ICs that handle hobby radio PWM to motor control PWM. If you can't find an existing program for a PIC, you'd probably have to write it yourself.