just curious - what is the function of the circuit board at the end of the drill? 
I mean, what is it DOING at the bottom of the hole?

On Thu, 20 Sep 2018 15:38:24 +0000, Stadem, Richard D <[log in to unmask]> wrote:

>I work for a company in Norway (in my spare time, LOL) who manufactures downhole electronics. It is a completely different world, building electronics that must survive, MUST survive, in the world's harshest environment, quickly going from typical 16-20 deg. C then to freezing while in arctic water in the north Atlantic, then quickly ramping up to as hot as 175 C during normal all-day drilling, sometimes hotter for a short-term controlled drill, then it is flooded with a mix of oil and mud and gravel and salt water, and the shock and vibration are beyond belief. You come away with a different perspective on high-rel electronics than you ever had before, believe me.
>