Delta Pulse

[kt315]

If you post a clear photo of the PCB we could match it up with known versions and tell you what those IC's are.

HF how to do clear photo of the PCB
again guys I URGENTLY AND URGENTLY ask you do the images more legible.

please do these step by step!

1. wait clear sunday time. do not hurry. the sun must be VERY OPEN!
2. GO OUT from your home, at your homeyard, at the open sunlight.
3. place PCB so the sun light will be from left upper PCB corner.
4. the shadows must be short, but they must be! slightly cloudy daylight
will give pics without shadows.
5. do a photoshooting - find and set MACRO mode in your camera. set ZOOM if you need. ZOOM must choiced analog, not digital.
6. you have NOT EVEN A TINY CHANCE here to get the answer if you are doing your Home Work poorly and woorse.
7. set your camera on high resolution. your pics has to be from 5MB and more. for the forum 1200-1600 pixel has be good.
8. send your pics to [email protected] with subject in subject field:
new hires pics of board [detector model name] for your collection.
9. Forget your egoistic intentions only take on and give nothing in return.
do not cultivate your EGO.
10. do not waste your time making pics in your room. you will get only a trash absolutely unusable. yes, you and me are not professional cameraman and have not the needed light pro equipment on your working table, so keeping some rules i offer and you will get perfect pics and btw will learn how to make perfect photos of your family, lovingyou, children and the Nature itself. BELIEVE ME thats is EASILY.
11. if you think your pics done in a room are good enough for the forum - its only your deeply delusion.





GOOD LUCK IN THIS YOUR NEW HOBBY.

[Toros]

in the manual it is written for best performance coil between 3 -7 oHm, I built one with 5.6 oHm 58 turns of 0.30 mm 38 diameter .

0.30 mm is too small wire size. It should be about 0.6-0.7 mm

[abdennour]

what is the number of turns , can this detail cause a reheating of IRF ?
Thank you !

[Toros]

what is the number of turns , can this detail cause a reheating of IRF ?
Thank you !

Pulse induction detectors work with different coils. Usually, the inductance of the coil is given as the starting point. Delta pulse typically work with coils that have an inductance of about 400 µH (micro Henry). It is not necessarily exactly 400 µH, but this approximate value is sought regardless of the diameter of the antenna (50x50cm or 100x100cm). The thickness of the conductor from which the coil is made only counts for the power of the pulse emitted into the ground. After you make the coil and connect it to the detector, you have to understand the exact value of the extinguishing resistor connected in parallel to the coil. It is given as 2k2, but in reality for each coil it has a different value. This is important for the proper operation of the detector and the depth of which metal objects will be detected.


µH

[kt315]

my DP working with microcoil (tape's eraser head) and there is maybe 0.05...0.07mm diameter wire inside.
https://www.youtube.com/watch?v=YxfeuI1hQM0

[abdennour]

I am not a pro, how can I know the exact value of this resistance ?

[Toros]

I am not a pro, how can I know the exact value of this resistance ?

The resistor is replaced by a potentiometer 5k set to the maximum value. An oscilloscope is then needed to monitor the received signal. Turning the potentiometer will clear the parasitic signals. See this picture:

http://s1.hostingkartinok.com/uploads/images/2012/03/c3a5aef7c54cff620e3cfadd696df3f9.gif

Then the potentiometer is replaced by a constant resistor with a value equal to the one measured by the potentiometer.

[Toros]

Merry Christmas! I wish everyone a merry welcome to the new 2018 year.

[abdennour]

Thank you it's a pity I do not have the tools to do this , I do not even know how to use an oscilloscope , I pay the kit 100 dollars, it is brand new, just IRF I think burned, if I find I made an exchange with kit sniffer simplify with 6 potentiometers.

[6666]

Thank you it's a pity I do not have the tools to do this , I do not even know how to use an oscilloscope , I pay the kit 100 dollars, it is brand new, just IRF I think burned, if I find I made an exchange with kit sniffer simplify with 6 potentiometers.

try and get your money back from ebay

[kt315]

you have a strange way to welcome new or guest of this forum, you have a strange way to welcome new or guest of this forum, i think i'll try to repair it alone , by changing all the components . thank you !

bla bla bla. that seems you are NOT cooperative tovarisch. you went in society and ask 'hey! give me a free beer and coffee cap! I WANT! i am guest of this forum!'.
what you get in your face right directly??? you have to think before you write something here.

90% of the answer is contained in right formulated question. THATS RULE. you do not want to help yourself.

[abdennour]

thank you for the photo, I begin to learn through the schematic , I do not know but when there is no frequency at the output coil I think lm556 is burned ???

[dbanner]

The inductance of your coil is too high(58 turns, .3mm wire, 38cm diameter) gives app. 4.3mH inductance. This is way too high. The 2.2K damping resistor is for coil with much lower inductance ~400uH. You must wind a coil with about 22 -25 turns, this would put you in the ballpark, then you can vary the value of damping resistor for your coil.
KT315 is right. Your pictures suck! If you want assistance here then you could at least take better pics of your pcb(both sides), otherwise everything is just abra kadabra and you might as well chuck it.

[dbanner]

I use this coil calculator for pi coil. I found that it is very good compared to actual measured inductance. For the L(lenght) I just use either 3mm or 4mm. You can solve for inductance or number of turns.

[dbanner]

Do you have any experience in electronics?