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CDV-715 Retro Digital Geiger Counter : Page 4

Figure 4 CGK-02 Geiger Counter Circuit Board with three different GM Tubes

CDV-715 Retro Digial Geiger Counter

So by using this Geiger counter circuit you can power any GM tube that requires either 400 or 500 VDC. The board is the same as the pc board in the original article with the addition of a mounting holes drilled into the pc board colored in red, see figure 5

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