Thanks so much for your advice
what about this transformer:
http://www.abra-electronics.com/products/750%252d00060-12V-Power-Inverter-for-CCFL.html
It seems to be perfect for the job, 660V with 12v ac (i need 400v, so around 9v is good)
I would have never thought it would be as easy as simply...
First post! :)
I am building a Geiger counter with this circuit:
http://www.pocketmagic.net/wp-content/uploads/2011/03/geiger-simple-1b.jpg
in the blog the author used a regular EI transformer from a power supply, but I tried disassembling them and broke the ferrite core 4 time now, so I...