Pinpointers TOPIC

[ik5pwr]

...Collapse signal of coil feed inverting input of U4

[hobbes_lives]

Is U4 drawn correctly in the schematic, with the coil input to - and the feedback loop to + ? It seems that pins 2 and 3 are reversed, at the very least?

[ik5pwr]

yes next days I share a basic routine in picbasic ...not a full source

[Qiaozhi]

This is my project ,Pulse induction pinpointer 1 Euro at 6/7 cm compact and long probe version.

Are you planning to post the source code for this project?

[ik5pwr]

Homebrew Pulse induction pinpointer

This is my project ,Pulse induction pinpointer 1 Euro at 6/7 cm compact and long probe version.

First test http://www.youtube.com/watch?v=SKnRRMh-dGE
Assembly http://www.youtube.com/watch?v=ueFmYIovjGg
compact & vibra http://www.youtube.com/watch?v=CwNmoFbAL6k

battery is a Litium 11,1 V connect at charger with multipolar share a
coil probe , led at bottom indicate when battery is low , at start is possible to choice silent mode led /vibration or buzzer (default)

sorry for my English

[Gyur666]

Does anybody have something experience about it?

[Legaucho]

If the search appliance starts to give false signals (frequency of the LC has changed for whatever reason) should press the button "Calibrate"

The main characteristics not the coil. More importantly tuning frequency LC. It should be within the range 18-19 kHz. (Measured at 5-th pin of controller)

The first "beep" sound - indication of the power on and the beginning of calibration. If the calibration is successful, the other sound (like the sound of flying arrow).
If the calibration failed, the error signal in a buzzer. This means the frequency of LC is not stable. It can be if power is not from the battery or coil are not shielded or bad capacitors 100 nH

Thanks Eddy, sorry for my late answer, I was out for few days, I will try your comments, and I will keep you advice.

Thanks again

Luc

[Eddy71]

1- How use the push bottom "Calibrate",

If the search appliance starts to give false signals (frequency of the LC has changed for whatever reason) should press the button "Calibrate"

2- Can you give us the caracteristic of the coil( diameter,mH, wire size) , can we use one rod coil for example?.

The main characteristics not the coil. More importantly tuning frequency LC. It should be within the range 18-19 kHz. (Measured at 5-th pin of controller)

3- Is it normal when when you put on the power, in the first time the buzzer make one sound, and after each 10 secondes this sound is repeating.

The first "beep" sound - indication of the power on and the beginning of calibration. If the calibration is successful, the other sound (like the sound of flying arrow).
If the calibration failed, the error signal in a buzzer. This means the frequency of LC is not stable. It can be if power is not from the battery or coil are not shielded or bad capacitors 100 nH

[Legaucho]

This pinpointer works on the same principle as TrackerFM. Only much easier to manufacture. Nice for beginners.
Sensitivity at 14 cm coil in a large metal approximately 0,5 m.
Copper coin 25mm sees with coil diameter of 70mm at a distance of 65mm.
For LC oscillator using an internal comparator of the controller.
The pages filled md4.ru 5 different versions of the firmware - for different coils can be chosen.
Its name in English "Babe FM"

Hey Eddy71

Three more questions:

1- How use the push bottom "Calibrate",
2- Can you give us the caracteristic of the coil( diameter,mH, wire size) , can we use one rod coil for example?.
3- Is it normal when when you put on the power, in the first time the buzzer make one sound, and after each 10 secondes this sound is repeating. And there no effect when you pass one metallic object over the coil ( my coil: diam 70mm, 1.45mH, wire diam 0.315mm).

Waiting for your comments

All the best.

Luc

[Eddy71]

This pinpointer works on the same principle as TrackerFM. Only much easier to manufacture. Nice for beginners.
Sensitivity at 14 cm coil in a large metal approximately 0,5 m.
Copper coin 25mm sees with coil diameter of 70mm at a distance of 65mm.
For LC oscillator using an internal comparator of the controller.
The pages filled md4.ru 5 different versions of the firmware - for different coils can be chosen.
Its name in English "Babe FM"

[Stefano]

http://translate.google.com.ua/trans...02&sl=ru&tl=en

GOOGLE helps to you

Yes, that's the way I've used, but not very understandable:

"Over the bucket will not say.Do as pinpointer for small coins in the sandbox search.I think if you attach a larger diameter coil will be as TrekerFM. So in a branch about to answer it. First Source here:
http://vrtp.ru/index.php?act=categories ... nWhat is the Russian-language program for the controller does not know - I wrote it in English
As for selective impulsnika until soon, not until the summer - in time for work .. Dam And there is much to be pereprbovat. I want from the complexities of the coil to move away. So that was a bit more room, but not "up to a millimeter."With the collapse of the Union with a wire winding issue. . It is not always possible to find exactly edakii, especially in remote areas .."

Does it mean that you wrote the source with comments in English?
To download the link above one need to be registered....
I'm aware that hex code is available, but I'd like also to understand the principle on which it works. For example the Tracker FM (if I remember correctly) has a 555 to make the coil oscillate and the micro detects frequency variations as in a BFO MD, while yours has the LC circuit directly connected to the micro pins.

[GSL]

I made this device. Worked very well as pinpointer. The operating frequency of the device 18 - 19 kHz. Firmware in the attached file.

[Eddy71]

http://translate.google.com.ua/translate?js=y&prev=_t&hl=ru&ie=UTF-8&layout=1&eotf=1&u=http%3A%2F%2Fmd4u.ru%2Fforum%2Fviewtopic.php%3Ff%3D8%26t%3D3602&sl=ru&tl=en

GOOGLE helps to you

[Stefano]

As far as I understand from the Babelfish translation of the Russian forum, there should be the source code commented in English. Is is correct? Could we have it here on the forum?
Thank you.

[Eddy71]

Look here. This is easier and distinguishes metals.

http://www.md4u.ru/forum/viewtopic.php?f=8&t=3602