Messages

1

Technical / Re: DC Offset in operational amplifiers in DC coupled front ends of P.I detectors

« on: January 25, 2014, 12:33:59 am »

No wonder some of the shelf GPX are better than others,A bit of a lucky dip from the dealer? WA just had 150mm rain in Kalgoorlie so the
mud is here for at least two weeks. My 4000 is on the way for this fixit Woody while we sit it out.

2

General Discussion / Re: Nugget Patches

« on: November 25, 2013, 07:21:04 pm »

Thanks for the help posting Woody I will get the hang of it. As a follow on to understanding nugget patches I am posting a photo of what I mean when I say smooth nuggets as loner's with friends. All nuggets are not from the same source at a given location and can come from different source rock types, which gives the nuggets a characteristic surface patten. Some rock types always produce patches with greater numbers of nuggets of smaller size as do other rock types (host rock) allow the gold to form into larger more solid nuggets. Knowing the tell tale pattern on a nugget when you find it and knowing the host rock that makes that pattern can help you enormously when in new country. Being able to find the right host rock laying around in the surface rubble zero’s you into the right area to start your search and an expectation of the type of nugget size helps you select the correct search mode and pattern for that area.

3

General Discussion / Re: New Mods being worked on.

« on: November 11, 2013, 11:44:32 am »

Gooday ARIZONA, you sound like an old hand, and I see you "can get ya about any electronic part you could want here in Arizona" I am after a Display Board for my GPX 4500.
Part Number 5902-0116 Revision 1-2. Mine stopped working as they as they all eventually do and I cannot buy one in Australia. Hope you can help me out Mate