Geiger Counter PCB for Flyport

One of my first Programs for the Flyport Module was a small Geiger Counter Software, it can be found here:

http://community.openpicus.com/forum/projects-place/887/my-first-project-wlan-geiger-counter

Today I built a small PCB for a complete Geiger Counter, including the Flypport Module.

A Flyback Converter followed by a Diode Cascade Voltage Doubler creates 400 Volts DC to power a SBM20 Geiger Counter Tube. A small transistor then shapes the Impulse from the Tube, the Impulse is counted on the IN1 Pin.

Full description (in German) can be found here:

http://www.loetstelle.net/projekte2/flgc/flgc.php

Have Fun!