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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > PI Designs & Deepseekers (Moderators: Eugene52, Cornelius) >

Instability solved depth lost

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xavier Topic starter

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	Instability solved depth lost « on: August 07, 2011, 01:27:55 pm »

Hi guys

The instability on my detector has been resolved, it proved to be the connector from the coil to the box that was causing me all the problem however now I have lost ground penetration any idea's?

All the best
Xavier

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japanese

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GARY PI

	Re: Instability solved depth lost « Reply #1 on: August 07, 2011, 01:41:09 pm »

Hi xavier
Any detector type? - whether was working previously in any situation and what led to the new change that has occurred?

best time

j.

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	Re: Instability solved depth lost « Reply #2 on: August 07, 2011, 01:55:36 pm »

Maybe you need to monkey with the damping resistor? Maybe that old connector had some resistance to it?

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xavier Topic starter

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	Re: Instability solved depth lost « Reply #3 on: August 07, 2011, 02:49:12 pm »

	Quote:	Posted by homefire
Maybe you need to monkey with the damping resistor? Maybe that old connector had some resistance to it?

Funny you should mention the damping resistor I was thinking that there was a resistance in the plug that would have affected the damping resistor too.

Hi Japanese

This is a modified version of the DBP2010 works great just had the instability problem but having resolved that caused a new problem now with the depth (will have a look at that damping resistor)

All the best
Xavier

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	Re: Instability solved depth lost « Reply #4 on: August 07, 2011, 02:55:15 pm »

That's the only thing I could think of as you just changed the connerter.... I know you would never leave a cold solder joint! LOL! Tongue

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	Re: Instability solved depth lost « Reply #5 on: August 07, 2011, 03:15:56 pm »

No no cold solder joints are not my thing. I'm going to use a variable damping resistor to get the right resistance or I could try and do a simulation on SPICE that would be a good exercise for me as I'm new to SPICE come to think of it, it would take me so long it just aint worth it back to plan A LOL.

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	Re: Instability solved depth lost « Reply #6 on: August 07, 2011, 03:19:19 pm »

Never messed with SPICE. Some day. Huh?

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	Re: Instability solved depth lost « Reply #7 on: August 07, 2011, 03:33:39 pm »

That's what I kept saying then I stumbled across a video explaining the basics of it but of course what's the point of just watching the video so I downloaded SPICE4 the free version well that and the tutorial got me fired up LOL now I'm just looking for an excuse to use it.

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http://www.afrotechmods.com/tutorials.htm

there are three videos well worth watching.

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	Re: Instability solved depth lost « Reply #8 on: August 07, 2011, 03:39:11 pm »

Hi xavier
equation all resistance= resistance coil+ resistance cable + {resistance of FET}{Cancel because he has 2 TR} =6 OHM
damping resistor= 390 ~ 680 {Depending on what requests}

best time
j.

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	Re: Instability solved depth lost « Reply #9 on: August 07, 2011, 03:47:22 pm »

Thanks Japanese

But I don't quite get your formula my coil is 3R with the coax so how do you get a damping resistor of 390R?

Regards Xavier

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