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Stop building PI detectors!
PI PI PI PI PI when I'm reading this forum! 
Please stop it, you are doing yourself no favor with it!
PI's are slow like a snail, they have no useful groundbalance, can't detect cavity
and discriminating or even notch-filtering metal is still at a worse level!
I'm telling you this because of many years of treasure hunting expierence!
When I'm sweeping the coil its 5 times faster as it would be possible with any PI detector
but exactly such a high speed is needed to cover enough ground in a given amount of time!
And believe me, my search results are not just good, they represent find-records meanwhile!
Put here some fine induction balance detector schematic which even can find cavity
and built that one. With or without programmable micro-controller!
PI technology is antiquated and always will be! You can't just simply "flash" the whole area
with an extremely high electromagnetical field and expect good results!
The soil is no playground for radar-wave-reflection!
Let's see it as a bad habit or fashion of this forum being that highly concentrated
on PI detectors but its like an addiction which should stop because it leads to nothing good.
If I would be evil minded I wouldn't care and even would be glad because with those
homebrew PI detectors the risk is pretty low that others can catch away my own treasures
but 1st those who built them are not where I'm hunting and 2nd the reason of life is
to reach for the stars and not for the junk-yard!
And if you're nice I even will reveal to you the absolutely best coil design ever within
the next year or so! An ultralightweight coil which finds small stuff but also super deep!
Of course it will be induction balance for highest sensitivity and contrast factor results.
Sorry, but it was really time for a little warning about PI and those who built it naively.
Don't waste your time with PI if you can built with the same amount of time, money and
expenditure some double as good detector, one with reliable metal-discrimination, GEB,
long lasting batteries, reliability and great depth!
I repeat: Stop building PI detectors!
ps:
And don't get fooled by those overpriced Minelab detectors!
They might be OK for gold-nuggets and those who find enough of them but they use
much more complicated technology and therefore plays in a different liga than "DIY-PI".
And even with all those technology behind including high price they are not the best if
it comes to old antique or very deep stuff.
Please stop it, you are doing yourself no favor with it!
PI's are slow like a snail, they have no useful groundbalance, can't detect cavity
and discriminating or even notch-filtering metal is still at a worse level!
I'm telling you this because of many years of treasure hunting expierence!
When I'm sweeping the coil its 5 times faster as it would be possible with any PI detector
but exactly such a high speed is needed to cover enough ground in a given amount of time!
And believe me, my search results are not just good, they represent find-records meanwhile!
Put here some fine induction balance detector schematic which even can find cavity
and built that one. With or without programmable micro-controller!
PI technology is antiquated and always will be! You can't just simply "flash" the whole area
with an extremely high electromagnetical field and expect good results!
The soil is no playground for radar-wave-reflection!
Let's see it as a bad habit or fashion of this forum being that highly concentrated
on PI detectors but its like an addiction which should stop because it leads to nothing good.
If I would be evil minded I wouldn't care and even would be glad because with those
homebrew PI detectors the risk is pretty low that others can catch away my own treasures
but 1st those who built them are not where I'm hunting and 2nd the reason of life is
to reach for the stars and not for the junk-yard!
And if you're nice I even will reveal to you the absolutely best coil design ever within
the next year or so! An ultralightweight coil which finds small stuff but also super deep!
Of course it will be induction balance for highest sensitivity and contrast factor results.
Sorry, but it was really time for a little warning about PI and those who built it naively.
Don't waste your time with PI if you can built with the same amount of time, money and
expenditure some double as good detector, one with reliable metal-discrimination, GEB,
long lasting batteries, reliability and great depth!
I repeat: Stop building PI detectors!
ps:
And don't get fooled by those overpriced Minelab detectors!
They might be OK for gold-nuggets and those who find enough of them but they use
much more complicated technology and therefore plays in a different liga than "DIY-PI".
And even with all those technology behind including high price they are not the best if
it comes to old antique or very deep stuff.
............. 
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