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Offline Sov535
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« Reply #30 on: December 07, 2009, 05:16:27 pm »
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OK, thanks!

Now I'm waiting to see a handful of coins and jewelery from your next hunt!!

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Offline bludgerTopic starter
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« Reply #31 on: December 08, 2009, 02:40:39 pm »
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[waveing]Yep hopefully the weekend, Terry Herbert watch out, did you hear about that find in Staffordshire England millions of pounds worth of gold relics found by a detector.

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Offline technos
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« Reply #32 on: December 12, 2009, 08:02:58 pm »
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I have a couple of observations. Every modern detector should be able to withstand an accidental power supply reversal imho. And they should be able to handle out of bounds (within reason) voltage conditions.

The fault was found to be a zapped trace (which acted like a fuse). I noticed that the first thing people do is chase after the active devices. But I have seen a number of capacitors go bad (specifically the tantalums) with a power reversal. Also, many electrolytics in older machines are now heading south. I suspect that is the greatest bane that is also the most overlooked - bad caps of one sort another going bad. Interestingly, most modern devices are amazingly resilent torwards abuse. Even many of the FETs that used to go belly up with a static charge. But that is for another subject.

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Offline bludgerTopic starter
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« Reply #33 on: December 15, 2009, 04:14:00 am »
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Yeh pretty hard to get that panel off and with minimal components and tracks on it, would have liked to have had access to it initially, my test readings were spurious and so i did'nt think it was there  Undecided.
With electo's they can dry out over time especially  where they get hot, like in power supplies
I found a computer thrown out, supply was switchmode and protected, would'nt switch on, tested motherboard it was low.
Connected regulated supply to board,at the board voltage, wound up the current till problem, stuffed old electro smoked.
Nothing like cooking a stuffed old component or land bridge short to find it quick, good old trick.
Modern FET'S have the protection diode too, yeh the gate on them seems to take some handling abuse, we use to joke in the when i worked in the industry, 80's, that gremlins caused ic's to fail, static killing components was just a myth.
Especially when we were chained to a test bench with an anti stat strap all day.     

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Offline gabry1999it
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« Reply #34 on: September 10, 2010, 02:36:09 pm »
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Anche nel mio sovereign si era rotta la sezione alimentazione switching..bs170= 2N7000

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