Simple High Voltage Generator
This generator supplies up to 2kV DC and can be used for testing capacitors, semiconductors, wirings etc.
On YouTubeDE you can find a video about this
project: https://youtu.be/hLx2Qwq1lGQ
A simple HV-probe 1000:1 up to 5kV for DIY:
Simple HV-Probe (pdf)