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Offline chawkiz@live.fr
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« Reply #140 on: December 06, 2010, 07:55:27 am »
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nice project i wel do it but i need change some compenant

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Offline bchampig
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« Reply #141 on: December 18, 2010, 10:55:38 am »
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Has anyone added ground balance features to the Chance?

Thanks

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Offline Mac_Gyver!
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« Reply #142 on: January 10, 2011, 06:06:59 pm »
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Hello everyone I am not clear how to connect the coils. could you explain to me how to proceed with the work of assembling of the metal detector? I read everything but I have problems to translate! Thanks in advance! Smiley

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Offline WM6
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« Reply #143 on: January 13, 2011, 08:54:57 am »
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Quote:Posted by Mac_Gyver!
Hello everyone I am not clear how to connect the coils. could you explain to me how to proceed with the work of assembling of the metal detector? I read everything but I have problems to translate! Thanks in advance! Smiley


Read schematic it is in universal electronic language. Coil is mono, very simple to connect at X1 points (con 2).

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Offline Mac_Gyver!
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« Reply #144 on: January 20, 2011, 04:26:17 pm »
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Thanks for the reply! What has to be connected to the connector X 2?
Be patient but I'm only now getting closer to the world of electronics!

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Offline mickeu
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« Reply #145 on: January 20, 2011, 05:21:05 pm »
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Hi guys

I build my one CHANCE and i got small problem, some strange signal rises even with unconnected coil, for me sounds like 50 hs power line interferences but i try in the field around 200 meters away from the "civilization" and i got still the same signals. just with barrier on level 16  gets bit better.

I think that can be something with receiver section, i used some replacement parts 2SC945 - BC182; КП505 - BS170; A733 - 2SA1015. Maybe BS170 is the problem?
This is link to my video, please have a look and give me some ideas what is going on.

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16 sec - shown unconnected coil plug
1.00 min - i connected the coil plug
1.30 min - sound similar to 50 hz power

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Offline WM6
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« Reply #146 on: January 21, 2011, 03:19:52 am »
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Hi Mac_Gyver & mickeu

mickeu, congratulation on your work I hope you overcome troubles soon. Try to break line once betveen T0 and AVR and once between T1 and AVR.

X2 is AVR programming connector.


As 2SC945 and A733 use standard European (or other western) NPN/PNP counter-pod like BC548C and BC558C.

As KP505 ("n" in russian transcription mean "P" /out of Greek letter Π "PI"/) you can use one of N-Channel enhancement mode field effect transistors like BS170 or 2N7000.


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« Reply #147 on: January 21, 2011, 07:29:10 am »
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Better discrimination of objects of silver is possible only through a system of two coils, transmission and reception...

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Offline mickeu
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« Reply #148 on: January 21, 2011, 08:32:23 am »
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Hi WM6

I replaced all transistors plus MCA 3201 and OP37 and still this same problem even with no coil.
Any ideas?

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Offline mickeu
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« Reply #149 on: January 21, 2011, 12:37:56 pm »
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Bit more

WM6

I disconnected T0 and T1 and there is no difference. I think that can be something with TRX section.

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