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These are fairly easy:
- You can use the circuit inside (amp board) as a throttle for small motors. This way you can power and run small cars, robots, boats, submarines and other things. You get variable speed in two directions. Unfortunately these circuits are not terribly efficient/good speed controls for indoor airplanes, but for airplanes there are lots of other choices out there, many of them not very expensive. If you want control over forward and reverse, your choices are much more limited, and amp boards are a good choice.
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The servo can also function as a gearbox with built-in speed control. If you make fairly minor mods to the servo mechanism you get to have it go round and round for as long as you move the transmitter stick. You can control the speed in both forward and reverse. This mod will work on 99% "standard" servos like the Hitec HS-300 and the "quarter-scale" servos like the Hitec HS-700, HS-805 and others. It will not work on micros such as the Futaba S-133 and similar. It may work, but is very difficult to do on sub-micros like the FMA S-80. It will work on some intermediate servos such as Futaba's S-132, but that's a very nice, somewhat expensive servo and there is absolutely no reason to do it. Anyway, this can be used to power tanks, robots, "Moon/Mars rovers", to spin things like scale radar dishes on scale ships, cranes and other uses.
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