Project:
Nikon D800 for astrophotography ?

Contents:

1. Nikon D800 overview
2. Adapter Nikon to Pentax 645
3. Lid, Dove tail, Tube ring
4. Focuser mechanism, driver
5. Off-axis guide camera
6. Computer module and DC/DC converter
7. DC/DC general triple converters
8. Main bracket
9. Wiring & USB-HUB
10. Test with Windows and APT
11. First Light
12. Balance system
13. Nikon vs Canon, Pentax FA vs Pentax
14. Tilt adjuster
15. KStars/INDI setup for Nikon
16. To be continued

Note:
I take no responsibility or liability for what are written here, you use the information on your own risk!

7: DC/DC general triple converters

I already before built a triple DC/DC converter to power different devices. There is always a need for some odd voltage. My earlier design was very closed. This one will have the screw terminals on the outside of the enclosure and holes to adjust the output voltage from. Not necessary to open the lid every time there is some adjustment to do.

Enclosure:

A well ventilated enclosure with openings around the screw terminals. Before the 3D-printer era all kind of special design like this was almost impossible, now just some hours at the 3D-CAD design tool.

Circuit board:

The three DC/DC converters installed, output adjustable from 3 to 12 volt with 13 volt input. 2 Ampere maximum current on each with an attached cooler. The yellow device is a PTC-fuse, an automatic fuse, this one 2.5 Ampere at 12 volt. I normally have 8 Volt for the Canon / Nikon camera and focus driver, 5 to 6 Volt to the powered USB HUB. The last one I can use to feed the dew heater with a low voltage to reduce the power.

With these few components it's easy to use a general circuit board. I prefer to have the negative (black) on the left terminal so I have to cross wire it.

3D-printed and assembled together, the left terminal is the input.