Gravitrax power supply with PWM controller
Description
This is a battery case for motorized marble lifts like ffleurey's: https://www.thingiverse.com/thing:4178353. it was inspired by raily74's combined version of the lift with a battery case: https://www.thingiverse.com/thing:5332796, but I wanted something more loosely coupled which fitted in with other Gravitrax objects,disguised as a spacer. I also decided to incorporate a small and inexpensive PWM (pulse width modulated) motor controller into the design. This provides an efficient means of varying the speed of the motor from zero to full speed without the overheads of a simplistic potentiometer approach and also provides an on-off switch. The height is customisable and can incorporate various battery options. I decided to use micro JST 2-way connectors to provide an easy means of adjusting the length of the wires to the lift.
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