(Inspired by a suggestion on the astronomical forum cloudynight.com)
This easy device can replace advantageously the >90$ 12v commercial controllers. For 1/3 of the price.
Dew can sometimes be a problem on telescopes. People have used extensively small resisting devices around their telescopes, however uncontrolled heat leads to fuzzy stars due to changes of refractive index of the air around the telescope.
The purpose of this device is to be controlling the amount of heat needed to eliminate dew from a telescope. This device can be remoteley controlled with a IOT relay that can turn on/off at given intervals at night if wanted during star acquisition pauses.
Parts:
- 10 A/ 12v DC power supply (25$)
- dew heater stip the size you need
- 5.5mm x 2.5mm Female DC Power Jack Socket Panel Mount 2 Pin Solder Type.
- RCA Female Socket
- plastic box
- DC 12V 5A Motor Speed Controller PWM Speed Control Ultra Small LED Dimmer（2PCS）
- 2x 5 mm red led light and 1.2kohm resistor
- copper Wire
- dril, hot glu gun, tools, patience
