Floor Choices
Suet Fai Kan Herbalist
budchoo.com online store
P A N G  Industries
Android Development
Content last updated:
January 26, 2016 13:04

email us at pang@budchoo.com

Implementation of Cooler Crawler Throttle for model railroading
boardless component layout
Component layout for soldering. Component not to scale. Modified to suit available parts.
Schematic by Rich Weyand.
Original design plans, schematic, and component list by Rich Weyand.
waveform
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.
getting ready for assembly
Must've spent like a week working out the layout on paper before I put the things together.
Dud switches
Those nice looking, nice feeling momentary push switches I got at Mike Quinn's just didn't work.
Bad switch installed
Didn't know until they were installed and had to remove them and replace with Radio Shack ones.
Relay
The next thing that sucked was the relay that does the reversing, they tended to stick, return spring was not strong enough compared to the coil.
Bad component choices
A bunch of bad component choices, like, not getting the right cap 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.
Bad choices
A few more bucks of investment later... a power supply that works.
finished product

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