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Offline techobgTopic starter
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« on: June 04, 2010, 06:58:39 am »
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Hello friends, I have a problem with that metal detector.
Once burned by the charger will not start at all, I have changed it several transistors (NSDU45 analogue), (2N3904) and (BDX54-analogue).
Then the device work, but there was no sound in headphones and capture a very shallow!
If anyone can help with ideas, I would greatly appreciate it!

Greetings!

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« Reply #1 on: June 04, 2010, 07:05:33 am »
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Do you have the schematic?


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« Reply #2 on: June 04, 2010, 08:00:59 am »
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Hello,Homefire i have these schemes, but they are very small differences, my metal detector modification is following the same pattern.

Here are pictures:
{alt}
{alt}

This picture is like my metal detector, but lifted her from another site by a colleague with similar problems.
{alt}


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http://media.snimka.bg/6401/019057709.jpg
http://media.snimka.bg/6401/019057711.jpg
http://media.snimka.bg/6401/019057708.jpg

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Offline Homefire
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« Reply #3 on: June 04, 2010, 08:19:06 am »
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Yep!   That is the same one I have.


Check the output on the LM358!   And this follow the train.   Wise

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« Reply #4 on: June 10, 2010, 12:51:54 am »
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Thanks homefire, the cause of sound was confused BDX54, detectors work, but caught very many shallow ...
Which elements affect the depth ....
Greetings!

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« Reply #5 on: June 10, 2010, 07:20:57 am »
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Not quite sure what your trying to say?

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« Reply #6 on: June 10, 2010, 08:43:30 pm »
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you correctly diagnosed the original problem, so he now has a working detector.  Unfortunately, it only picks up shallow targets.  What changes do you recommend for increasing the depth?

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« Last Edit: June 11, 2010, 09:34:16 am by BitburgAggie_7377 » 		Logged
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« Reply #7 on: June 11, 2010, 07:00:07 am »
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Turn the ELEMINATION control fully off or Down.

Try again.

This changes your delay timing on the sample taken.

Let me know! Wise

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