The GC/RL Geiger Counter / Radiation Detection and Data Logger Project
Schematic

The complete Schematic (click to enlarge)
The Schematic consists of four Sections, which are interconnected to give the desired functionality. I will briefly explain how every section works. The Circuit uses only basic components and no advanced Rocket Science Tricks (apart from the Flyport Module itself) and can easily be built by moderately skilled people with basic knowledge of electronics.
Sections
High Voltage Generation
Signal Conditioning
Dataflash Memory
Flyport Module
Bill of Materials