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I am sure we have some dew up lostock so spent yesterday making a pulsating DC voltage controller for my home made nichrome wire dew heater, develops about 13 watts.
Got kit from Jaycar, took more than the 60 minutes that they suggested to make it but in the end it works well, figure don't want the scope to get "dewed up"
In the end cost a lot less than a kendrick dew heaer and controller which incidently isn't available for the 200mm LXD 75 S/N anyhow.
I used to dabble in electronics years ago, the pack didn't say to allow another 2-3 hours for trying to see the colour bands on the resistors because of increasing age and reduced resistor size.
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