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Secondary Dew Heater
OK, I need some help here, especially from your electronic tech types.
I am a klux, big time, when it come to electronics.
The requirement is to produce a dew heater for the secondary on my 16" truss dob, and after reading the recent posting by Astronut I reckon it is time to get amongst this.
I need help to decide which resistors to buy and use. In the past I have used short lengths of nichrome wire, encased it in a sheath and wrapped it around the objective or eyepiece, and powered it with 12 volts.
Assuming someone can help, what I need is the exact JayCar part number or whatever identifier, so I c an go buy it/them and solder it all together. It doesn't need a fancy PCB as far as I can tell and while the temp on/off system would be nice I can live without this as well.
Any takers?
Thanks
Gary
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