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DIY dew control
Hi,
I have used the e-Bay LED dimmers and have made my own small controller.
I feed it from a SLA battery, the only cable from battery to mount.
Having no 240V out in the field just makes it so much safer.
The SLA is housed in a $17 box and the box has 2 x 12V out and also one LED dimmer with 2 outputs, currently not in use but could heat a eyepiece box.
I have a 12V out from the dew-controler to my DSC to reduce cables.
The controller connects to the Telrad, and a cable gors from the Telrad to the heater strap on the lens.
The Telrad heater and a band for the refractor using resistors, Telrad 2 and Heater band 10.
The lens heater is just 10 resistors (30mm long) soldered across a seperated (by 30mm) speaker cable in 20mm distances , in a plastic sleve and sewn between a 50mm elastic and 50mm velcro.
I have attached some images.
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