Hot Rodding a CDV700 Geiger Counter

Published:2013/3/10 22:47:00 Author:Ecco | Keyword: Hot Rodding, Geiger Counter | From:SeekIC

The original power supply for the CDV700 and CDV700-6B uses two pairs of D cell batteries. The 3V-6V battery set supplies the oscillator circuit with 33ma of current when properly adjusted. The 0V-3V battery set supplies the detector circuit with a few ma of current. This causes the batteries to wear out at different rates. Conversion to modern NiMH C cells allows the counter to run for longer periods of time. The rechargeable batteries work well with a small solar panel for recharging. A set of 5 AA-size NiMH cells would also work for this application. NiCd cells can also be used, but NiMH cells have higher power density and are generally better batteries. After six years of occasional use, both of these meters are still running fine on the original NiMH battery sets. The PV panels have been located indoors on sunny window sills.



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