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In relation to the link provided by Acropolite, a similar low cost dew heater controller that can be knocked up quickly is kit K3070 DC Motor Controller available from D Smith. The kit is around $16 in Tasmania. I build one and it's perfect. Output current is 1 Amp which will control heaters up to 12 Watts. The unit is so small I intend to knock up three of them in one case so I can control my Dew Heaters individually. With one controller supplying 3 dew heaters (EP and Finder scope) I find when I get one optimised the others can be too warm or too cool, this fixes that problem nicely and ultimately saves unnecessary battery drain.
In relation to interference to other electronic scope devices there are methods of addressing this so one battery or 12v power source can be used. When I get some work off my plate later this week I'll post an article to this thread.
Kind Regards Ian Gillespie
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