robertgawron / gammaspectrometer Goto Github PK

This is blocking #7

Remove associations to Raspberry, since it might be any other client, remove part with GUI, recheck amount of sensors.

This is important because it will be in a closed enclosure.

I'm sure, I will calculate it wrong :-D

There's a lot of papers online and I don't know a lot of things, but a simple and working version should be chosen.

With this, explore more things.

Note: PCB area is huge, there's space for two design in parallel

• low input bias currents
• low low noise

Place needs to be added around places where chassis is mounted to 3D printed holders, so that it's possible to remove PCB from chassis without disassembly of the whole device.

At least three PCBs are needed:

• polarization of the tube (easiest)
• HV generator board
• data acquisition

Git branch TBD.

Chosen PMT needs 1k5V, much more than originally planed, using cascode with transistors in series seems to be a bad idea.

Use shunt voltage regulator for first winding of transformer, this will keep regulator-transistor voltage small. High voltage wil be build by connecting transformers winding in series. This will also solve problem with finding diodes with sufficient reverse voltage.

There are at least two options:

• simple resistor divider
• usage of transistors in divider

Purpose of putting capacitors in parallel to resistors in last dynodes is unclear.

Life is life.

In configuration with resistor dividers polarizing PHT, -just in case- add mentioned RC filter,