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DP vs PS
Hi Geo!
I did not try any other number of windings. It was a wild guess with 18 turns and it
worked satisfactory. I am not sure that it is analog to count no.of turns by diammeter of
coil. It must be some other factor for calculating number of turns. I noticed that it is
not the rule,since i made over 50 diff. coils for PI's in last years. For large coils it is
usually from 14 to 20 turns, but again it is not a rule, i am not sure 100%.
All depends of wire gauge and current also of freq. too. I am not quite competent to explain
that proper.75 cm coil is detecting 2 cm coin from 25-28cm distance....poor! But i made
large coil with idea only to detect larger object in higher depths. The dumper resistor is
1 k and it will stay as it is in all my experiments. The frequency is adjusted to 398 Hz and
i did not adjusted it any more. From time to time i test it with freq. meter just to be sure
that oscil. is working stabile with no drifts. And it is working very stabile.
The inductance tell's me not to much. I am used to experiment "in vivo". Why? Simply,i noticed
many times that theory "drifts" from real life. Theory is just very important starting point, but
final results you'll get only by "sweat". Why is that so? Well, i am here in my place using my
components(condensers,resistors,spare parts...etc) and respecting schematic, at the end i gain
some results, you in your place using your components respecting the same schematic gain quite
different results !? There is a lot of differences in the material we used, in Cul wire....in
instruments we are using to measure...etc.etc.. Even from the same manufacturer you can find
the same type of component but with quite different performances.That's why i do respect theory but
mostly rely on my own experience. 75cm coil worked nice from the begining and i am satisfied with
it. I already wraped it in plastic and glued it hard.It is difficult for me now to bargain about
more or less windings. If i find some more of "hoola hop"-s i can experiment further.In that case
i'll report here to you the results. 42cm coil did not worked from the first try. I made 3-4 coils
on 42 cm holder and all worked very poor, cose i respected theory about less windings. At the end
i left that theory and put 35 windings on it and it is working good now. It might work even better
but right now i am tired of making any more large coils. Next step is to make a small coil, only for
coins. I am planing to use some 20cm former and wound from 24 to 45 windings, wire from 0.2 to 0.5mm
and test it.When i gain result that it can detect 2cm coin over 30cm i'll stop.It will be enough
for my needs.I think it is possible, what do you think?
I have read almost all from Eric Foster's works, from the others too. I learned much from them.
It is very,very good starting point to understand main principles of PI detectors. But the best
results i gained yet from my own experimenting.It was not big difference from what that people
claimed, but it were some minor "drifts", by reasons i mentioned above...(working conditions,
material, measuring instruments...etc.)
SO far i made a few PI's. Some "toys" and this very good Delta Pulse. When i compare it with
Pulsestar II i can tell you one thing: in some cases it is working much better than PulsestarII !!!
Also i noticed that Pulsestar II and Delta PUlse, both are less sensitive on Cu than other materials.
Why is that so!? Pulsestar II is very sensitive on ground conditions,Delta Pulse is not!
Pilsestar II is very sensitive on that "silver" Al paper from cigarettes and chocolate wrapped in,
Delta Pulse is not !? But it is very sensitive on some Al object, also on Ag object too!
For example, delta pulse can detect Ag knife over 40cm, Pilsestar II over 45cm...
The main advantage for Delta pulse, for me, is that i can further affect on it by extra adjustments
and further improvements, on Pulsestar II i can not! It is very expensive toy, and those two PIC's
are protected, so any further "playing" with it can bust it.Also it has smt pcb, sprayed with
some resin, and it will be high risky to try to solder something more on it.
If Delta Pulse show simillar results on the field than i guess PulsestarII will be on sale, very
soon!!!
O.K. Geo that was all for now. If you have time, you may post some coil specifications you made
it and some extra test too.
Keep in touch..
Best regards!!!
Hi Geo!
I did not try any other number of windings. It was a wild guess with 18 turns and it
worked satisfactory. I am not sure that it is analog to count no.of turns by diammeter of
coil. It must be some other factor for calculating number of turns. I noticed that it is
not the rule,since i made over 50 diff. coils for PI's in last years. For large coils it is
usually from 14 to 20 turns, but again it is not a rule, i am not sure 100%.
All depends of wire gauge and current also of freq. too. I am not quite competent to explain
that proper.75 cm coil is detecting 2 cm coin from 25-28cm distance....poor! But i made
large coil with idea only to detect larger object in higher depths. The dumper resistor is
1 k and it will stay as it is in all my experiments. The frequency is adjusted to 398 Hz and
i did not adjusted it any more. From time to time i test it with freq. meter just to be sure
that oscil. is working stabile with no drifts. And it is working very stabile.
The inductance tell's me not to much. I am used to experiment "in vivo". Why? Simply,i noticed
many times that theory "drifts" from real life. Theory is just very important starting point, but
final results you'll get only by "sweat". Why is that so? Well, i am here in my place using my
components(condensers,resistors,spare parts...etc) and respecting schematic, at the end i gain
some results, you in your place using your components respecting the same schematic gain quite
different results !? There is a lot of differences in the material we used, in Cul wire....in
instruments we are using to measure...etc.etc.. Even from the same manufacturer you can find
the same type of component but with quite different performances.That's why i do respect theory but
mostly rely on my own experience. 75cm coil worked nice from the begining and i am satisfied with
it. I already wraped it in plastic and glued it hard.It is difficult for me now to bargain about
more or less windings. If i find some more of "hoola hop"-s i can experiment further.In that case
i'll report here to you the results. 42cm coil did not worked from the first try. I made 3-4 coils
on 42 cm holder and all worked very poor, cose i respected theory about less windings. At the end
i left that theory and put 35 windings on it and it is working good now. It might work even better
but right now i am tired of making any more large coils. Next step is to make a small coil, only for
coins. I am planing to use some 20cm former and wound from 24 to 45 windings, wire from 0.2 to 0.5mm
and test it.When i gain result that it can detect 2cm coin over 30cm i'll stop.It will be enough
for my needs.I think it is possible, what do you think?
I have read almost all from Eric Foster's works, from the others too. I learned much from them.
It is very,very good starting point to understand main principles of PI detectors. But the best
results i gained yet from my own experimenting.It was not big difference from what that people
claimed, but it were some minor "drifts", by reasons i mentioned above...(working conditions,
material, measuring instruments...etc.)
SO far i made a few PI's. Some "toys" and this very good Delta Pulse. When i compare it with
Pulsestar II i can tell you one thing: in some cases it is working much better than PulsestarII !!!
Also i noticed that Pulsestar II and Delta PUlse, both are less sensitive on Cu than other materials.
Why is that so!? Pulsestar II is very sensitive on ground conditions,Delta Pulse is not!
Pilsestar II is very sensitive on that "silver" Al paper from cigarettes and chocolate wrapped in,
Delta Pulse is not !? But it is very sensitive on some Al object, also on Ag object too!
For example, delta pulse can detect Ag knife over 40cm, Pilsestar II over 45cm...
The main advantage for Delta pulse, for me, is that i can further affect on it by extra adjustments
and further improvements, on Pulsestar II i can not! It is very expensive toy, and those two PIC's
are protected, so any further "playing" with it can bust it.Also it has smt pcb, sprayed with
some resin, and it will be high risky to try to solder something more on it.
If Delta Pulse show simillar results on the field than i guess PulsestarII will be on sale, very
soon!!!
O.K. Geo that was all for now. If you have time, you may post some coil specifications you made
it and some extra test too.
Keep in touch..
Best regards!!!
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