Me and an Friend want to design an custom Xray imaging device that scans objects using a Custom Xray System and Sensor , (also a Fpga + Arm board , my helios stardance project) . Its an CT scanner under 1k ..
I jumped into a Discord Call with @Marco_da_mechanic and we saw the slot mutliplier pcb needs a little adjustment to fit perfectly and after some planning with him we decidet to put the hbj11 (small tube)s filament driver beside the flyback slot on the mutliplier pcb , so i grabed the toroid step model that marco made and made the footprint etc for EASYEDA … then i designed the first Half bridge driver and when i finished it i saw a BIG problem .. i forgot the CT (current transformer) wich is crucial ! So i redesigned it and addet the slot connector .. (If you are interessted in the Xray head assembly go look at marco’s posts) (EDIT : i forgot the stiching vias under the mosfets for thermal , but the mosfets are anyways cooled by the oil !)
Small Update , i remembered the Cooling Element or as i call it (Thermomix thingy) is in the way of the pcb so i made the second breakout board and this time 2 sepperate pcbs as they are cheaper like this , sadly i cant make use of the extra space on there as the hv will only make problems … also the flyback and filament leads are on the top part of the Xray head anyways
After @Marco_da_mechanic send me this : https://cdn.discordapp.com/attachments/1348678447026798685/1523441721957159013/Screenshot_2026-07-05_233256.png?ex=6a4c1f2a&is=6a4acdaa&hm=9630d7b6abc3b31502ec46904c7bfa0874f5752c832159679a345e5dee401c74 … i knew this pcb design approach wont work so i decidet to make the multiplier + flyback (the big slot cutout) as a sepperate small pcb , as you can see there is another Pcb but its snappable off as the size of it is over 100mm and that would cost extra so i made them together snappable … Also as you can see there are 2 outstanding slots wich will be used to solder the pcb inside the other one with the big holes so the 2 HV outputs are connected to the 2 Xray tubes..
I made the bottom half of the Xray head Pcb , this turned out to be my worst looking PCB ever and an absolute nightmare , a HV multiplier with 2 connection points far from each other and a u shape like layout , then a zvs and flyback transformer on this space constrained pcb … it was pure agony …
For the Electrical Side of RadiaX i wanted to start with the Xray head electronics , in a past protoype i used 20kv 1nf caps in series , same for 20kv 5ma diodes but this gives eg. 40kv 0.5nf effective capacitance and its just a huge bottleneck , especially with the 2 xray tubes used . So i let Claude (turned out to be more work than just doing my own research , Ai’s love to bullshit) to give me research papers sumamries of tapping a voltage mutliplier somewhere in the middle to get a lower voltage or in my case 2 tubes … it turned out to be a working idea and i mean onkly 1 tube is on at the time so all is fine .. then i need the 40kv 2.2nf caps wich aliexpress had but lcsc not in stock , so i made the footprint for them and proccedet to do some more research on how i will actually build the desing cleanly in the xray head , from past experience in building xray heads i know that the HV part needs especially well thoughts or the only thing that will happen is BZZP (arcing)
