dave
Junior Member
Posts: 56
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Post by dave on Nov 7, 2016 14:54:09 GMT -8
Thanks Gary , ...I have two induction meters that I use , I usually test with both just to be sure as there is a small difference in measured values but they are very close to each other. The 'DD' coil I'm working on is for the TGSL build . Detection range is not all that good ( apparently these don't have a huge depth even when coils are correct induction so I'm trying for exact inductions to maximize performance .) The coils I have made work ok but I'm sure I can improve depth a little more . Sorry I cant post pics of them at the moment as I'm getting upload error message . I do think its my computer , its been misbehaving lately ....Windows 10 ....mmmmmmm.
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Post by Gary Lecomte on Nov 8, 2016 6:34:51 GMT -8
Making coils for VLF detectors is more difficult than PI detectors. It is not just the Inductance, but also the associated capacitors and their tolerances.
But with properly tuned coils, the detection distance should come close to the same as a PI Detector
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Post by genl on May 10, 2017 5:26:14 GMT -8
hi everyone! just made and assembled the pulse 2...it detects metal and very sensitive....but my problem is....the audio is the reverse effect....instead of going fast....it slows down when a metal is present....what might be the problem thanks in advance
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Post by Gary Lecomte on May 17, 2017 6:20:52 GMT -8
Hi Glen, Sorry I Don't know why this is happening on your detector. I have sold Hundreds of this detector and this has only occurred One time Before, and I Can't remember Why it happened. But if you were to Mail the PCB Back to me, I would repair it.
One Thing you might Check.
Put a Meter on Pin 6 of IC10. When Metal comes Near the Coil, Does the Voltage go More Negative, Or More Positive?
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Post by genl on May 19, 2017 6:04:26 GMT -8
Hi Glen, Sorry I Don't know why this is happening on your detector. I have sold Hundreds of this detector and this has only occurred One time Before, and I Can't remember Why it happened. But if you were to Mail the PCB Back to me, I would repair it. One Thing you might Check.
Put a Meter on Pin 6 of IC10. When Metal comes Near the Coil, Does the Voltage go More Negative, Or More Positive?
Hi Gary....thanks a lot for that offer,,,,anyway ill think about it if i already gave up on this.... "Put a Meter on Pin 6 of IC10.
When Metal comes Near the Coil, Does the Voltage go More Negative, Or More Positive?" it is......Voltage go more Negative....
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Post by Gary Lecomte on May 20, 2017 5:53:44 GMT -8
[/i] it is......Voltage go more Negative....[/quote]
Than IC10 is Operating Correctly. So your problem is somewhere in the 555 Circuit or the transistor. Check the number on Transistor, it should be a 2N4125.
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Post by genl on May 24, 2017 16:13:29 GMT -8
Hi Gary..
transistor replacement is 2n3906....i replaced all the 555 ic...still the same...
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Post by Gary Lecomte on May 25, 2017 7:16:33 GMT -8
Did you buy this detector from me?
If NOT, Your out of Luck for further help from me!
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Post by genl on May 25, 2017 16:18:33 GMT -8
unfortunately, i did not buy this detector from you....i just assembled the parts by myself after 15 years of file storage....
yes, i understand from the start that you wont help anybody those who do not buy this kit from you .......anyway thanks for your
time....i rest my case...peace!
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Post by genl on May 29, 2017 19:02:12 GMT -8
Hi everyone! In my respect to Gary...the designer of this project Pulse Detector..i would like to post and update you guys, that i did troubleshoot already the problem of my detector....upon analyzing....i was wondering, it looks like it feedbacks-off during the presence of metal near a coil.... the problem lies on the connection point of my coil....i mistakenly reversed the connection.....i am using a 4 inch bi-filar tesla coil ( 3 connection)...hastily wind ( not flat)....and it works great as expected....and very stable!...i feel very fulfilled that i made it work! coz im not an electronic techie...just a youtube viewer...and a die hard detectorist! my million thanks to gary!
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Post by genl on May 30, 2017 18:35:08 GMT -8
here is my setup...
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Post by Gary Lecomte on May 31, 2017 5:40:41 GMT -8
That Tesla Coil is probably Not the best type of coil for a Separate Receive and Transmit Function. And your coil is not really Bi-filar wound, (Flat Coil) It is just Scramble wound.
Normally for the separate receive and transmit function, the receive coil will have more turns than the transmit coil.
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Post by Genl2 on Jun 19, 2017 21:05:14 GMT -8
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Post by Gary Lecomte on Jun 20, 2017 6:05:24 GMT -8
Yes, But Only if you use Separate 8 or 9 Volt Batteries for it. Why don't you just use an Analogue Micro-Amp Meter?Attachments:
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Post by Genl2 on Nov 2, 2017 5:05:00 GMT -8
Please see my homebuilt pulse induction metal detector from Gary's Design... Thanks! youtu.be/1aCSQSvqUKo
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