Experimental Modern and Quantum Physics for Do-It-Yourself Science Enthusiasts 

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Home Instrumentation CDV700 Pro Geiger-Müller Counter Pictorial Instructions for Modifying ENI CD V700 into CDV700 Pro

Pictorial Instructions for Modifying ENI CD V700 into CDV700 Pro

David Prutchi's CDV700 Pro Geiger Muller Counter

We modified a surplus Civil Defense V-700 radiation survey meter made by Electro Neutronics Inc. (Model 6-b) into a very capable radiation counter capable of working with both Geiger-Müller and PMT scintillation probes. We modified the front panel to accommodate the new switches, connectors, and panel light. In addition, we placed a Veeder-Root count totalizer module on the side of the box. The new electronic components, including a Zener diode stack and a PMT preamplifier are wired directly to the original printed circuit board.

The following file supplements the information in the book by showing each step in the modification process with large color pictures and expanded diagrams.

Click here for tutorial in pdf format

Click here for datasheet of Veeder-Root totalizer module

Please visit www.prutchi.com and www.diyPhysics.com for other cutting-edge d.i.y. projects, and remember to check out our new d.i.y. Quantum Physics book:

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  1. […] I purchased two “Giant Super Sensitive MC6″ GM tubes from Electronic Goldmine (Item Number : G18717, Unit Price: $89.95).  These are Russian-made new-old-stock model MC6.  They are 10.25″ long x 0.9″ diameter.  I compared the sensitivity of these tubes to the other GM tubes that I use with my CDV700 Pro Geiger Counter. […]

  2. […] just finished constructing a low-cost, yet highly sensitive gamma-ray scintillation probe for our CDV700-Pro counter.  The probe is based on a Philips XP5312/SN photomultiplier tube (that is available from Sphere […]