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Offline deep maxTopic starter
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« on: May 09, 2012, 12:50:38 pm »
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Hi anybody made this shematic, how work in realy ground?Thanks

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« Reply #1 on: May 09, 2012, 01:16:07 pm »
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There are some older parts in there that are going to be sorta hard to find.

The Driver Transistor is more then Old Hat and could be replaced with a Faster Mosfet.

I like the Twin Coil Set up.   Some companies came up with that set up but calls it a Imaging Coil or Dual Field.

Looks simple enough to Up Date and progress with.

The High Pulse rate, 700Hz is quite fast for a PI.

I suppose they did that to provide a Gain in smaller targets .

I  This detector is simple enough that it could be produced as a Pin Pointer if done right.



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Offline GoldDigger1950
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« Reply #2 on: May 09, 2012, 01:37:51 pm »
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Quote:Posted by homefire
The Driver Transistor is more then Old Hat and could be replaced with a Faster Mosfet.

The design uses transistors in the Darlington configuration which is quite up to date. Why are you suggesting a MOSFET for this design?

This inquiring mind would like to know.

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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.
Let's Talk Treasure!

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« Reply #3 on: May 09, 2012, 02:47:28 pm »
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Hi, thanks.This detector detect only nonferous metal?

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Offline GoldDigger1950
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« Reply #4 on: May 09, 2012, 03:22:56 pm »
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Ferrous and non ferrous both should be fine, mate. It looks like a fun project. I may try it myself one day when time presents itself.

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« Reply #5 on: May 09, 2012, 04:51:29 pm »
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 Your the boss on design and stuff.   I just have my way of thinking.


I see the Mosfets as being faster Turn on time and less Capacitance over all.

They have a Ringing Problem if not Damped in the End but are much faster.

On and Off!...

They are much better then say a Bipolar Transistor for this Application.

Hell, Even some SCR's are faster then BiPolar Transistors.

Why has no one tried them?




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« Last Edit: May 09, 2012, 07:43:54 pm by homefire »
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« Reply #6 on: May 10, 2012, 01:20:14 am »
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Quote:Posted by homefire
Your the boss on design and stuff.   I just have my way of thinking.


I see the Mosfets as being faster Turn on time and less Capacitance over all.

They have a Ringing Problem if not Damped in the End but are much faster.

On and Off!...

They are much better then say a Bipolar Transistor for this Application.

Hell, Even some SCR's are faster then BiPolar Transistors.

Why has no one tried them?

Because the designer made some decisions which cannot be changed without changing the design. Where is the driver isolation transistor for the MOSFET? Where is the anti kcikback circuitry for keeping the collapsing magnetic field from destroying the MOSFET? Your suggestion is not valid for this circuitry. Not only that but a Darlington pair is not a simple bipolar transistor at all.

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« Reply #7 on: May 10, 2012, 09:50:07 am »
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Hello, in the other forum GEOTECH sasho varna is said that this scheme is not complete and that there should be a ground balance. Smiley

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