My astronomy project:
TS130 upgrade, 130 mm f/7 APO telescope

Content:

1. Mechanical
2. Electrical
3. Stands
4. Brackets hub and computer
5. Bracket motor focus driver
6. Triple DC/DC converter
7. Power splitter
8. Dew heater and lens cover
9. Telescope unbalance
10. To be continued

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

2: Electrical

With this new setup I will redo the electrical system to be more user friendly and practical.

Focus controller and USB hub:

Before I plan for the last details I want to test some astrophotos. I had to rotate the guide camera 180 degrees to have the USB connector point upwards. The image will be upside down but that can the guide software handle. A bracket (the silver one) hold the focus controller and a USB Hub, more about: MyFocuserPro2 which it's built around. I use a much smaller USB hub now, I will have a separate 5 volt power supply for the Raspberry. With that it's easier to adapt it to new models, the Raspberry Pi 5 needs more power, 5 Volt 5 Ampere.

New power cables:

To the new setup I use about the same kind of cables that I have to the smaller telescope system. Cable 1 to 5 handle the 12 volt system.

1. 2 meter extension main power cable, 2.5 mm², only used on the balcony
2. Inlet cable to the power splitter, 2.5 mm² main 13.5 volt in
3. Output cable to the mount, 1.5 mm²
4. Output cable to DC/DC 12/5 volt 6 amp converter for computer and hub, 1.5 mm²
5. Output cable to motor focuser, 2 dew heaters, etc, 1.5 mm²
6. Extension cable for GPS, needs to be away from electric noise
7. Serial to USB adapter, FTDI chip, Dsub 9p

With the power output divided to three terminals I can reduce the fuse size and make it more selective. I will use polyfuses which is an electronic fuse. Compare to the older setup I have shorten the cables from the power splitter to move it closer to the devices. The Sky-Watcher mounts that I have, EQ6 and HEQ5 are sensitive to low voltage. Below 12 volt it fail, better with 13.5 volt. Low voltage loss in the power cables is a must.

As power connectors I use ordinary ones from RC-cars, they can handle 18 Ampere. I both crimp and solder the connectors to the cables to ensures a reliable function. All DC cables are twisted to reduce the sensitivity to electric disturbances.

Other devices:

More devices to add: Raspberry computer, power supply 12 to 5 volts to Raspberry and hub, 12 to 8 volt for camera and maybe one more spare, power splitter fuse box with volt and ampere meter.