Most simple pinpointer sensitivity mod ever!

[Funfinder]

The trick is: alufoil-tape!

Stick a piece of it behind the coil area and lift it up while switching the pointer on.
After that press down the end of the piece and the Pinpointer is high sensitive.

To gain most sensitivity adjust the location of the tape while the pp is on
so the beep or vibration barely still doesn't goes off.
Of course no other metal must be near while doing this.

Check out that it's real alufoil tape and not some lookalike-nonmetal one.
Some tapes are real alu but have a thin invisible PET-protection-coating.
And the sticky layer should be real good.

There is also the possibility to scratch some markings into the pinpointers case
so its directly clear where is the area if some replacement tape should be needed.

And there is another useful purpose:
If the LED can not get switched off, the alutape can
be used to cover the whole light of the LED at night.

[Henrikras]

You can adjust or finetune or super tune the Garrett PP (the Black one), by playing with the inside reset swich..��
I made this video some time ago. http://www.youtube.com/watch?v=nekkZxQxr1g&sns=em.

[Funfinder]

Very professional approach and good job.

This way someone can make the pinpointer permanent around 40% more sensitive
if the reset value gets IC-stored even if the battery was removed for a longer time.

For ultra-sensitivity some auto voltage control would be needed, the magic value seems to be 6,09v.


The stability of the circuit at high sensitivity adjustment works still pretty OK.

For practical work a metalic, easy adjustable but not too lose lever still is the best.
That way with the thumb the PP can get adjusted directly while poking around
in the hole and make it minimal more or less sensitive, per instance if the soil
is very loamy and the coil is directly in contact with the ground.

Perhaps its also some improvement to make a small hole directly over the reset button
so the pinpointer no longer has to be put apart but with some needle or wire the actual
wanted sensitivity-level can be adjusted. While using the hole is closed with some tape.
Perhaps some little pipe has glued over the reset-button so its better to find,
but if the case-plastic is thick enough, the hole small enough and the used needle etc. doesn't bends,
it should work very good the direct way. Holding wire or needle over some lighter and melt
through the plastic provides a very small hole but it has to be exactly at the right spot.
Happy New Year!