I just got into Nixie tube clocks. I researched and found all the resources for the project (datasheets, models for Eagle/Fusion 360, etc.)
I designed a schematic as well as the board. The parts cost about 200 Euros and take weeks for shipment. It is my fist project with over 100V. That's why I really want to make sure everything works and is safe. I have a few concerns regarding the project.
Firstly, I should explain the function of circuit. I'm driving the Nixie tube via the K155ID1 BCD-to-decimal-decoder (controlling the ground connection) and 170V (145V after the resistor.) The decimal decoder and an RTC module (Tiny RTC I2C) are connected to the Arduino UNO. Im getting the 145V for the Nixie tubes from a 12V to 170V converter (NCH6100HV high voltage DC power) and the 5V Arduino power from an L7805 circuit both connected to an external DC jack (12V to 170V not on the board.)
I just wanted to make sure if my schematic would work as it is. I'm mostly concerned about the connections of the K155ID1. All ground connections are connected to one and another (ground from Arduino, RTC, K155ID1.) The VCC are connected to +5V of the Arduino. I'm also a little worried about the L7805 circuit. I found out a few circuits with L7805 (2 capacitators, 4 capacitators) but to my knowledge, I can run the circuit with only 2 capacitors.
- 170V and 145V
I've never worked with +100V, that's why I don't know the distance I have to put two conducting lines apart. Most of the power lines are on the top layer. I tried to space them as far apart as I could but again I really just want to make sure that it just works.
Some lines share their connections on one part, but on two different layers. To work properly both layers have to be connected. I'm not quite sure if the solder now connects both layers. This will affect the way how I let my BCP be manufactured. My university only produces PCBs that don't have copper in the holes. On the boards of an official PCB manufacturer I see that the holes are covered with copper.
If you've read to this point I would thank you for even reading it. Every answer or clarification will help me. But probably the best I could get is "It will just work" ;D.