Many Geiger Mueller probes are available that will work on the CDV-700 but they don't use the standard 900VDC that all 700's provide.
We've developed several circuits to address this issue, both in the single fixed re-regulator, the step adjusted re-regulator, and the continuously adjustable regulator.
Simple but effective single transistor, transformer based HV generators in CDV-700s are robust and purpose built. They are also power hogs. Most are capable of running 1600V safely, as a matter of fact, I cloned them into some pretty useful workbench HV supplies, one at 1600V fixed.
Caveat: within the CDV-700 context, I recommend limiting max. HV? to 1000V. Most Geiger Mueller tubes use far less, with?
400 to 500 being quite common, 700V in US Military RADIACs.
Any of these would work well on any CDV-700, save the wrong HV.
We've also considered completely eliminating the "current hog" HV and LV generator, replacing the with more modern designs.
The following posts will address these different solutions.
Geo
