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Old 24-02-2012, 05:09 PM
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peter_4059 (Peter)
Big Scopes are Cool

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Join Date: Jun 2007
Location: Brisbane
Posts: 4,002
You can purchase a heater ring from Theo
http://www.gamaelectronics.com.au/heater.html

They work on 12V and have a resistance of about 230 ohms.

You can also make one using resistors. The one I made has 48 ohms total resistance and works fine. I use a dew heater controller to adjust the temperature.

The Kendrick dew heater website lists the power ratings for al their dew heater straps and is a good starting point for sizing these things.
http://www.kendrickastro.com/astro/d...erheaters.html
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