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Changing the green LED of the Mintron video camera to a

dimmed red LED

I really like the Mintron video camera for deep-sky observations in conjunction with my

N11GPS and the Hyperstar lens assembly very much. However I found the very bright green

LED on the back, indicating that the camera is powered and thus active, very annoying. Thus

I replaced it with a dimmed red LED and thus:

a) the dark adoption of the eye will no longer be disturbed

b) the likelihood, that the pictures are disturbed by stray light coming from the bright LED is

reduced

c) power consumption is reduced by approx. 150 mW. This corresponds to approximately

7% of the whole camera. Thus also the heat generated in the camera and creating warm

pixels at the CCD is reduced.

There are only two components to be replaced:

1) the green LED “D1” is replaced by a low current 3mm red LED. Don’t worry; if you mix

up the two leads (Anode and Cathode) of the LED, nothing gets damaged. You just have

to solder it in once more correctly.

2) the 820 Ohms resistor “R1” is replaced by a 100kOhm resistor

Here is the small schematic change. On the left you see the old, on the right the new changed

schematic. It may be a good idea to test the combination of your LED and resistor with

respect to the achieved brightness before you solder them onto the board because some LEDs

may not turn on with 100 uA of current.

And here are two pictures to find the Resistor and the LED in the camera.

On the left you see the resistor “R1” On the right you see the red LED “D1”

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Celestron 44200 Instrucciones de operaciones Pagina 5