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Spockie-Tech
Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
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It depends on what you mean by "A Speed Controller"
Have a read of the articles linked to from this Wiki Page
http://www.robowars.org/wikka/EscHomeMade
If your head starts to spin after a few paragraphs, forget it.
Mosfets are deceptively simple little devices.. Lightly loaded, they're easy to work with, like building a robot to carry the newspaper around the house with tiny little motors.
But, start Flogging them hard (like Combat Bots do, asking them to deal with 50+ amps and the occasional stall/short while pushing another Bot) and a whole swag of black-magic electronics suddenly becomes necessary to keep the magic smoke inside.
Building your own *combat-capable* controller is a major undertaking and will *not* save you money. You cant get the parts at the prices that manufacturers can with bulk-purchasing, and it only takes 1 simple mistake to generate $50-$100 worth of magic smoke.
Speed (Power) costs money, how fast do you want to go ?
If you're really tight on $ but have time to fiddle, Talk to Andrew (Totally Recycled) about his Drill-Trigger controllers _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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Tue Sep 26, 2006 8:02 pm |
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