Housing
Figure 9 shows the finished PC board. All that’s left to finish off this project is a housing. You may use any housing large enough to contain the components. However I would recommend using a plastic non-conductive housing. This will help keep you safe from the +500 VDC GM tube supply and prevent grounding out the supply to the case and causing a circuit short.
Parts List
Geiger Counter Enhancements
(3) 3.5MM jacks with SPST switch
470 ohm ¼ watt resistor
Bridge Rectifier 100PIV 1.5 amps
Analog Meter
330 uf 16V capacitor
6.8K ohm ¼ watt resistor
PC Interface
16F84-20MHz Microcontroller (pre-programmed)
16 MHz Xtal
(2) 22 pf Capacitiors
(2) 220 uf 16-volt capacitors
2N3904 NPN transistor
220 ohm ¼ watt resistor
10K ohm ¼ watt resistor
3.3K ohm ¼ watt resistor
4.7K ohm ¼ watt resistor
7805 voltage regulator
DB-9 Female connector (solder cups)
Plastic Hood for DB-9 Connector
All are available on this website
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