View Single Post
Old 24-02-2012, 04:09 PM
peter_4059's Avatar
peter_4059 (Peter)
Big Scopes are Cool

peter_4059 is offline
Join Date: Jun 2007
Location: Brisbane
Posts: 4,270
You can purchase a heater ring from Theo

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.
Reply With Quote