CDV700 Geiger Counter

  
This project involves making several modification to an early 1960s era Victoreen CDV700 or CDV600-6B geiger counter. These counters are available on E-Bay for around $50 to $100. The modifications use modern electronic parts to improve the counter`s stability, extend the run time, and add a solar recharging capability.
CDV700 Geiger Counter - schematic

Circuit modifications include: * Conversion to a single 5-cell NiMH rechargeable battery pack. * Adding a voltage regulator to the geiger counter`s main supply. * Adding a secondary voltage regulator to the 3V supply. * Adding a



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