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Achernar
Post Laureate
Reged: 02/25/06
Posts: 3727
Loc: Alabama, USA
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Re: DIY Dew Controller Questions...
06/24/08 07:26 PM
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Make sure you put a fuse between the battery and everything else. It need be rated to handle the load you'll be placing upon your controller, but not so high circuits can be damaged. A bad RCA jack could short the whole works out and you really wouldn't want 200 amps of current surging through your controller because it will destroy it and possibly damage your telescope. Shorting a gel cell battery can also blow it apart or otherwise damage it as well. It happened to me once and the fuse blew as it was supposed to, preventing any damage. I made my own controller, which functions very much like a single phase load center or breaker panel found in your house, with linear variable resistors to control the amount of heat that each dew heater receives. It also supplies power to a cooling fan and my digital setting circles.
Taras
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10-inch F/4.5 Discovery Dob
6-inch F/8 Homebuilt Dob
4 1/4-inch F/4 Homebuilt reflector
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