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Offline issayatimTopic starter
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« on: June 10, 2016, 04:59:49 am »
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Dear All,
I finished building the dbp 2010 PI metal detector as shown in the picture. seems to be working and the ticking sound is OK. i can adjust the ticking speed with the controls . but when moving any metal object near the coil does nothing,  the sound is the same as if the search coil is not reacting with metallic objects. what could be wrong???
i read in on of the posts to change R34 (680 ohms) depending on the coil. but if the detector can be balanced to 3-5 ticks per second then the coil should react against metal objects. is that right???

did anyone face this kind of problem after building the detector???

Please help....



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Offline GoldDigger1950
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« Reply #1 on: June 10, 2016, 05:09:53 am »
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Do you have any test equipment? You first need to verify your power sources and then see if your coil has a signal to it. There is no way to guess what is wrong.

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« Reply #2 on: June 10, 2016, 05:15:56 am »
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the search coil have about 9 volts when testing each end with the ground

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Offline GoldDigger1950
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« Reply #3 on: June 10, 2016, 05:29:49 am »
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You failed to answer my question. Having 9v indicates there is a serious problem. You should see up to 400v on the coil, not 9v.

Now, please tell me what test equipment you have.

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« Reply #4 on: June 10, 2016, 05:35:52 am »
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i just have a Digital Multi-meter.

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« Reply #5 on: June 10, 2016, 07:54:39 am »
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I'll have a look at the schematic later and see if I can make some reasonable suggestions.

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« Reply #6 on: June 10, 2016, 08:04:31 am »
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Ok thank u very much

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« Reply #7 on: June 11, 2016, 11:34:51 am »
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Now there is the same old issue of which schematic is correct. I'm afraid it is impossible to help you without doing some precise measurements with a scope.

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« Reply #8 on: June 12, 2016, 03:05:27 pm »
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I dont have oscilloscope but i will check with my friends if someone has one.
Any other suggestions Huh?


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« Reply #9 on: June 14, 2016, 02:10:06 am »
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need oscilloscope..look at the transistor mpsa14,,is correct

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