*ops*
aha, so the top part of the article describes the addon module to make it all work. Kinda missed that and focused on the diagrams below. *blush*
Thanks for responding, much appreciated.
I also emailed the author and got this extract back:
> Except my knowledge level in electronics is not good enough to figure out:
> what IO1, IO2, IO3, IO4 are connected to?
IO1 goes to the probe wire
IO2 goes to the probe frame (stainless steel or aluminium grounding
rod). Alternatively, you can put two insulated wires as probes to
avoid earth loops should this be a problem.
IO3 and IO4 are pcb stakes that you solder the precision low
temperature drift resistor, after you first try various resistors to
get a full scale deflection you want.
> what the purpose of pcb stakes / pcb raisers are?
Because soldering and desoldering through hole resistors is quite
tedious
Regards,
John Jore