Thread: Dew Heater controller repair?
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  #17  
Old 18-04-2010, 10:41 AM
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kinetic (Steve)
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Join Date: Jun 2008
Location: Adelaide S.A.
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Malcolm, not sure a zener would be across the rails (which it is) in reverse
bias without a limit resistor.
D3 looks like it's simply polarity protection
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