Implementation of Cooler Crawler Throttle for model railroading

Component layout for soldering. Component not to scale. Modified to suit available parts.

Original design plans, schematic, and component list by Rich Weyand. The original image has been crudely butchered into the above image and four tables.

The magic is the way this circuit puts 'bumps' into the power supplied to the track. The idea is to jolt the motor at low rpm so it can crawl on the track.

Must've spent like a week working out the layout on paper before I put the things together.

Those nice looking, nice feeling momentary push switches I got at Mike Quinn's just didn't work.

Didn't know until they were installed and had to remove hem and replace with Radio Shack ones.

The next thing that sucked was the realy that does the reversing, they tended to stick ,return spring was not strong enough compared to the coil.

A bunch of bad component choices, like, not getting the right camp can be solved by ganging up a bunch of them together, right? That's what the text book said, but in real life its a nightmare. The heat sink is just a tea candle cup. Couple that with the bad switches and nothing works.

A few more bucks of investment later... a power supply that works.

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