here is my first spectrum that looks like a spectrum!
My high voltage from amazon with an simple RC filter works fine (a few mV ripple but will be improved later).
The new proper sound card (@48kHz so far but will be changed for a 192kHz soon) was the key of the technical problems....
There is still loads of things to improve but its a start...
I forgot to mention an important detail : there is NO preamp or other electronics other that just a primitiv crude shaper made of a CR-RC filter in series.
Ps : i'm not sure yet about the peaks values but I will try to get some calibration check source at work.
The weird thing is that I have to add a 10M at the output of the HV if I want the results to be linear...
à suivre
Chris.
