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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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	Re: Instability solved depth lost « Reply #20 on: August 07, 2011, 05:32:13 pm »

Great thank GD I'll get on it in the morning must get to bed it's 01:05 am over here way past my bed time LOL

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japanese

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	Re: Instability solved depth lost « Reply #21 on: August 07, 2011, 05:37:09 pm »

Hi xavier
Dual OPA lm358:It can replace UA4558,mc1458C,NE5532, NJM2068D, NJM2114, NJM2214D, NJM4558, NJM4558D,TL072,LT1057

best time
j.

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kabier2

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	Re: Instability solved depth lost « Reply #22 on: August 07, 2011, 06:01:32 pm »

hi Xavier may be you reversed the connection so the phase of the signal!!

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GoldDigger1950

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	Re: Instability solved depth lost « Reply #23 on: August 08, 2011, 01:55:31 am »

	Quote:	Posted by japanese
Hi xavier Dual OPA lm358:It can replace UA4558,mc1458C,NE5532, NJM2068D, NJM2114, NJM2214D, NJM4558, NJM4558D,TL072,LT1057 best time j.

The LM358 as it is used in this circuit is not something you can substitute. It has a unique frequency response.

Posted on: August 08, 2011, 09:54:10 AM

	Quote:	Posted by kabierkabier
hi Xavier may be you reversed the connection so the phase of the signal!!

This is not a new construction. This machine was working fine and then failed. It is a repair.

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	Re: Instability solved depth lost « Reply #24 on: August 08, 2011, 06:22:00 am »

Ooops It's not a LM358 it's an LF357 been reading to many schematics lately LOL

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	Re: Instability solved depth lost « Reply #25 on: August 08, 2011, 06:49:30 am »

Hi xavier
Single OPA LF357 :It can replace LF356, tl071 , LT1122, OPA627,OPA637,OPA604, AD797,AD811, AD844,OPA603,OPA134.

best time
j.

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xavier Topic starter

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	Re: Instability solved depth lost « Reply #26 on: August 08, 2011, 11:38:30 am »

Japanese the TL071 is a no no I tried it and the result was less than poor from what I can gather it's the slew rate that's all wrong as for the other chips that you mentioned I have not looked at the data sheet nor did I try them but I will download the data sheet on them and do a comparison.

Regards Xavier

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	Re: Instability solved depth lost « Reply #27 on: August 08, 2011, 12:40:58 pm »

Hi xavier
If you focus on slew rate you have no choice, but one is LM318.
best time

j.

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	Re: Instability solved depth lost « Reply #28 on: August 08, 2011, 12:43:48 pm »

	Quote:	Posted by xavier
Japanese the TL071 is a no no I tried it and the result was less than poor from what I can gather it's the slew rate that's all wrong as for the other chips that you mentioned I have not looked at the data sheet nor did I try them but I will download the data sheet on them and do a comparison. Regards Xavier

You'd be wasting time over ordering 100 of the real thing for $16.00 mate. Postage paid. I have reviewed every substitute and in this circuit, there is no substitute that will work properly.

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xavier Topic starter

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	Re: Instability solved depth lost « Reply #29 on: August 08, 2011, 02:39:19 pm »

Yes quite right I book marked that link that you gave me just did not have the time to look at it yet LOL you say 100 for $16.00 that's what I pay for two over here . I did a test using the same type of plug on my development detector which is the same as the problem child and guess what same problem so now what? these connectors are gold plated there should be a better not a worst.

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