Polish Pi

[Andi68]

The detector gets faster when you get theApplying Sanbanks Mods

[Bayu]

@Bayu, what did you use as your schema for the VCO? Please show us.

[Bayu]

my experience on two sample delay resistors:
i tried 20k for both (27uS sample delay) with a 50cm spiral flat coil about 350uH
detects gold very good but as soon as you try to go over some clean ground it does not work, too sensitive to capacitive effect of ground
have to shield it
but increase the resistors up to 27k both, it works like a champ
40uS delay if i remember correctly and very little ground effect
still catches gold
12gram bracelet 18k : 80cm
2gram ring 14k(not sure) : 17cm

I am seting freq 750hz 33k pin 1 from4011 use 10k
33k use trimp 50k to setting
330 from 6 lf357 replace 10r
Detec ring 1,8grams 18k 17cm in red ground

[Bayu]

Master help me please polones,how to set deep, use coil dim 50cm, how to set master please help
How many uH to coil and set componen ??

[Mr.Jaick]

[ATTACH]54610[/ATTACH]

good job thank you
where is that 2.2uF SAT cap left side connected? pin 6 of LM741 integrator?
did you change the original integrator before that 2.2uF SAT cap?
or this section is just a plug in

[Mr.Jaick]

I am seting freq 750hz 33k pin 1 from4011 use 10k
33k use trimp 50k to setting
330 from 6 lf357 replace 10r
Detec ring 1,8grams 18k 17cm in red ground

thanks
but with this low delay it will easily respond to ground and become annoying even with the SAT i think
do you shield the coil?

[Bayu]

thanks
but with this low delay it will easily respond to ground and become annoying even with the SAT i think
do you shield the coil?

No i dont use shield, mybe next time, i try to add ground balance and 4046vco,

[Bayu]

7

good job thank you
where is that 2.2uF SAT cap left side connected? pin 6 of LM741 integrator?
did you change the original integrator before that 2.2uF SAT cap?
or this section is just a plug in

2,2 uf audiofhiler conected 1k after 741. This vco must be use GB so that soil minerals are not read as targets

How to set polones so that can to deep detecting i have coil 50cm and what is the circumference formula?? Please help

[Mr.Jaick]

circumference of a circle is = 2pi r
pi = 3.14
r = radios
i don't think the ground issue is coming from vco, because it can be sensitive to ground or old clays with the original vco
if it's too sensitive to coil distance from ground then shield the coil it might help but for mineralization only GEB can help
about depth i'm not sure what you have done there but basically you have to get things right
coil, damping, sample delay, sample pulse width, gains and every thing else
one major depth limiter for you can be the VCO
I tried with the 4046 it was working good but at cost of lower depth (audio problem)
in my opinion the Audio section of any metal detector is as important as other parts if not more
cuz it's the only one who talks to your ears and tells you if there is any faint target down there
basically the middleman between detector and you

[Bayu]

circumference of a circle is = 2pi r
pi = 3.14
r = radios
i don't think the ground issue is coming from vco, because it can be sensitive to ground or old clays with the original vco
if it's too sensitive to coil distance from ground then shield the coil it might help but for mineralization only GEB can help
about depth i'm not sure what you have done there but basically you have to get things right
coil, damping, sample delay, sample pulse width, gains and every thing else
one major depth limiter for you can be the VCO
I tried with the 4046 it was working good but at cost of lower depth (audio problem)
in my opinion the Audio section of any metal detector is as important as other parts if not more
cuz it's the only one who talks to your ears and tells you if there is any faint target down there
basically the middleman between detector and you

here the soil minerals are very high, so VCO without GEB will be difficult to control because the empty land from the target can be read by a machine, if the sens is set according to the soil, if we move the coil sometimes there are higher soil minerals, variations in soil types here are very make it difficult, I use ic lm324 for vco the result is better than using 2 opam ic, thanks for the advice

[YIVANKA]

Hi all，who have more information about this variant？sch,pcb，，，，，

[kt315]

Hi all，who have more information about this variant？sch,pcb，，，，，[ATTACH]54722[/ATTACH]

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[YIVANKA]

now you can load all fullest pocket of files. just by ONE click -!
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Can't open，thank you.

[YIVANKA]

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Could you change the upload method?here or，，，

[kt315]

Can't open，thank you.

use WINRAR program.