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Offline kazem2114Topic starter
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« on: May 16, 2012, 07:09:00 am »
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Hi every one
my metal detector doesn't work . It's Laminous 15000
I found that this " Metal can package IC " doesn't have any voltage
I'm sure it burns...
But I have no clue what it is.
Manufacturers clear the part number of this IC
this is the image of it :

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http://aer.net78.net/photos/5b15a3bd8596.jpg

It has 8 bases and "ST" made that
Please help

Thanks

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Offline Homefire
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« Reply #1 on: May 16, 2012, 09:19:42 am »
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Do you see any power getting to the chip?

check on pins, 1,4 , 8 or 7?


Well it's most likely a OP Amp of a sort.

Can you post a clear photo of the surrounding components?

Trace out the circuit it is used in?



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Offline kazem2114Topic starter
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« Reply #2 on: May 16, 2012, 10:35:36 am »
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This is the circuit around it


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Offline Homefire
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« Reply #3 on: May 16, 2012, 11:36:51 am »
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Do you have any more of the schematic?

Your chip is pinned out and being used like a LM709 Op Amp could be used.

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http://www.dz863.com/datasheet-814225963-LM709_Operational-Amplifier/


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Offline kazem2114Topic starter
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« Reply #4 on: May 16, 2012, 12:11:14 pm »
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No it's not pinned out
This is the complete schismatic of this IC

Posted on: May 16, 2012, 11:49:17 AM
For sure it's an op amp
ST is manufacturer of this op amp...
and I'm sure it looks like LM709
Can you guess what's that?

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Offline Homefire
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« Reply #5 on: May 16, 2012, 02:21:11 pm »
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I am all but sure that is what it is.

Looks to be doing the Oscillator thing but I don't know what for.

Need more info.

GD has more info on this for sure but that is what I have to say.



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Offline GoldDigger1950
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« Reply #6 on: May 16, 2012, 03:42:19 pm »
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For certain it's NOT an LM709 because pin 4 cannot float in an LM709. Because the number is scratched off the original, the device is a mystery part.

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« Reply #7 on: May 16, 2012, 07:23:51 pm »
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GD, Pin 4 is not floating on his schematic.   709 like to go toast if both inputs are not locked in some place .   His pin 2 seems to be floating and may be why it toasted.

Looks to be only used as a Osc.   With pin two floating and in a IC SOCKET open leg like it was, RFI or EMF could have POPed it real easy.

LM709 were sucky to start with.

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Offline GoldDigger1950
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« Reply #8 on: May 16, 2012, 07:33:18 pm »
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Quote:Posted by homefire
GD, Pin 4 is not floating on his schematic.

There is no ground on pin 4 which is required for it to operate. Since it is tied to a capacitor, it IS floating.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #9 on: May 16, 2012, 07:41:24 pm »
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This is why God made Engineers!  EE type that is!

AC fed it is still afloat in a sense!   LOL Shocked Cool

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