Powerbox for 8" telescope

A powerbox for a Celestron C8 telescope to clamp on a Vixen bar. The clamp is here: https://www.thingiverse.com/thing:6479448

It includes:
* a [400W DC-DC boost converter](https://it.aliexpress.com/item/1005004605377690.html?spm=a2g0o.order_list.order_list_main.143.7aec3696T8NhKK&gatewayAdapt=glo2ita)
* an [80W DC-DC buck converter](https://it.aliexpress.com/item/1005005164130952.html?spm=a2g0o.order_list.order_list_main.71.7aec3696T8NhKK&gatewayAdapt=glo2ita#nav-specification)
* a [MyFocueser Pro 2](https://sourceforge.net/projects/arduinoascomfocuserpro2diy/)
* a [PWM controller for dew heater](https://it.aliexpress.com/item/33012725299.html?spm=a2g0o.order_list.order_list_main.158.7aec3696T8NhKK&gatewayAdapt=glo2ita)
* a counterweight filled with sand.