Surf Pi Pro almost discriminating

[sdesic]

Hello all,

Just few informations...
I used stock Surf Pi Pro (Surf XX PCB) with "standard" coil 24 cm 300uH in experiment...
Changed only delay pot with 51k resistor and started detector.
It detects 1 EURO in about 21 cm
tried modern beer bottle top ... detects it at 2 cm... magnetic - iron
18 mm copper - nickel coin is detected at 1 cm
iron and steel is detected at "normal" distance ... can of spray 40 cm ...
Aluminium is also good.

Discrimination of wrong metal

[sinclairuser]

barracuda is the same, you can adjust it to reject non ferrous but not the other way round, frustrating isn't it,

[sdesic]

Must try gold and silver ... installed trimmer 50k in place of my resistor
silver is detected @ about 17 cm