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Gallery >> Astronomy >> Astronomical DIY Projects >> Telrad Finder
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Astronomical DIY Projects

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Date: 10/31/2003 Views: 34

Telrad Finder

DIY Low Cost Anti Dew Heater for my Telrad Finder
7 resistors, each 15Ohm (1/4W) (and some heat shrinkable tubing) gives a total heat dissipation of 1.4Watts at 12Volts (115mA). This seems to be enough to keep the Telrad finder free of dew during very cold or very humid nights.


Selbstbau einer Anti-Tau Heizung für meinen Telrad-Sucher
7 Widerstände à 15Ohm (1/4W) (verpackt in etwas Schrumpfschlauch) ergeben bei 12Volt eine Wärmeabgabe von ca. 1.4Watt (bei einer Stromaufnahme von 115mA). Dieses Leistung reicht aus und hält meinen Telrad-Sucher auch in sehr kalten oder sehr feuchten Nächten frei von Tau.

Date: 02/27/2009
Owner: Gallery Administrator
Size: 4 items
Views: 191
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Gallery Astronomy Astronomical DIY Projects
7 x 15Ohm resistors, 1/4W

7 x 15Ohm resistors, 1/4W


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Front View


Internal View

Internal View


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Rear View




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