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pcb from China. i get pics on my email. guys, 4.72kOhm resistor value is my mistake. set 4.70k.
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you can set also 4.64k or 4.75k but then all values on board have to be same -!
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Greetings to you, brothers and sisters!
I assembled the device on a single-sided Board.
Immediately am asking forgiveness, that my of knowledge in radio electronics not strong, so can be quite elementary questions). No offense :-)
All the parameters of the component was observed.
The test coil is 40cm in diameter, 24 round solid conductors mm 0.5 - 3 coils 8 core Ethernet cable soldered into a single line. 390ohm coil damper resistor. Energy consumption 130-150mA. ICS and irf740 are not heated.
When the power is turned on, the device responds to all the variables of the torsion bar, reacts to the reset button. The sound from clicks to high tones. The coil reacts to the metal. Oscillogram meet the requirements, the pulse width TP2, TP3 and intervals TP3-TP4 TP4-TP5 within the acceptable range, change the adjustment of the respective variable resistors.
The only thing I don't like about oscillograms is the pulse width of TP4 and TP5 = 25.9 us, while it should be 45us.
Can this mismatch somehow adversely affect the operation of the device? How to adjust the correct pulse width? Currently, the sensitivity to iron pliers is about 30-35cm. I'll shoot a video later. That's not much. How to increase sensitivity?
The aluminum can is 30 cm high and 12cm in diameter, the sensitivity is poor, fewer than pliers, which are much smaller. Due to what it is possible to increase sensitivity to non-ferrous metals?
WBR, ficuss/
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Here are my oscillograms to the previous post.
TR1
http://i68.tinypic.com/33m1yip.jpg
TR2+TR3
http://i66.tinypic.com/344tl5j.jpg
TR3+TR4 min
http://i63.tinypic.com/jkukoo.jpg
TR3+TR4 max
TR4+TR5 100us
http://i63.tinypic.com/107jq5y.jpg
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Your first post in the forum is not allowed to contain any attachments or links. If it does, it automatically goes into moderation and needs to be approved by Admin. This is part of our anti-spam procedures.
I have now approved your posts, and there should be no further problems with any attachments.
Also, I have removed your duplicate post of #3393.Comment
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good job on your projectGreetings to you, brothers and sisters!
I assembled the device on a single-sided Board.
Immediately am asking forgiveness, that my of knowledge in radio electronics not strong, so can be quite elementary questions). No offense :-)Comment
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you use old diagram with mistake. delete it. http://www.md4u.ru/viewtopic.php?f=6&t=9684&start=25
right one --->>>Comment
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where did the trace burn? draw point on this pic.Comment
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you did touch pin4 +12V to -E test point.Comment
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KT515
To improve audiovisual information (when searching for other metal detectors except sound look at the screen to determine the signal strength), you can connect to the Board of Your development LCD Turkish development, as a simple display that shows the battery level and signal strength.
The assembled Board was connected to the test coil when changing the settings (sens; tr.hold) the sound appears and reset, the metal reacts.
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hello to all
hello.....
am new here and I wish I get help ..
I build delta plus 2 with the turcksh pcb and the detector not working ....its detect my hands only ...if I put the j3 switch up its detect my hands ..and for down its didnt detect any thing ..
I made nice pcb and do every thing the same
the sound.noise.trashhold.sens.gain.signal. working but its didnt detect I usa 110cm coil with 16 turn and 680ohm ...pleas helpmeComment
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look
This my pcbComment
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Post in this topic forum # 3159
I'm not an electronic professional.
I collected the payment under the Turkish scheme. I do not work in automatic mode. But works in manual. For the test at home, I use a coil 30 cm twisted pair wire 3.3 Ohm resistance.Comment
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