Another P.I. link

xavier

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	Re: Another P.I. link « Reply #120 on: September 07, 2011, 10:18:19 am »

Hi to you all the components list that I posted is WRONG do not use it I will post the correct list later on. Don't know what happened or why so don't ask Grin

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DOOLEY1972

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	Re: Another P.I. link « Reply #121 on: September 07, 2011, 04:50:36 pm »

hello xavier , and 6666 if your listening ,

day off from new job on friday , so planning a bit of a modification on the modified blind squirrel ,

going to add an extra sample to her for simple discrimination ,

duplicate the 4538 / 4098 ,4066 switch , hold cap , and 741 voltage folower ,

so another 4538 / 4098 triggered from the output of the original one ,

free up a switch on the original 4066 that are currently earthed out and trigger from second 4538 / 4098 ,

another hold cap and 741 voltage follower ,

so then i will have 2 voltages held in caps , simply use an op-amp on them to compare , and op-amp opperates either a red or green led depending on which one is higher , simples.

when the first TL 071 is offset to get the curve as shown on last post , and samples 1 and 2 are at the front and end of what i have shown , all iron and alu ,sample 2 is lower than sample 1, and with any high conductive target eg : gold silver and anything with nickle in it then sample 1 is allways lower than sample 2 , so op-amp added to outputs with simple led's attatched will show thype of metal.

so roll on friday , by friday night , i will be either writing a posative post with pics and diagrams with any problems ironed out ,
or i might just be cursing .................. Grin

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6666

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	Re: Another P.I. link « Reply #122 on: September 07, 2011, 06:08:35 pm »

op-amp operates either a red or green led depending on which one is higher

Hi Dooley and Xavier
I am interested in this Led idea
hope it works, but would be interested in cct even so
would like to experiment with it.
been hung up on a few other things here,
I made a post over at GT about getting a pic to work
with the timings, thanks for doing the pcb Xavier

and now for FRANKENSQUIRREL

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xavier

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	Re: Another P.I. link « Reply #123 on: September 08, 2011, 03:49:25 am »

Why not just use a voltage comparator on the first of amp? well three of them I must look to see if I can find my schematic on the one that I build for my VLF also works with two leds one green for metal and one red for non ferrous one could add a LCD with a PIC and get quite fancy without too much hassles I do love them PIC's LOL 666 would you be so kind as to give that PCB a look over I have a problem with the detector and I cant seem to put my finger on it Ho and here is what I believe to be the correct components list.

All the best
Xavier

Posted on: September 08, 2011, 10:19:47 AM

Here is a photo of it

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6666

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	Re: Another P.I. link « Reply #124 on: September 08, 2011, 05:06:40 am »

Hi Xavier
will try and look over the pcb for you
hope you get it working
I was very happy to get the pic working
it all just worked, this whole pic setup has always been
difficult, with all the varibles.

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xavier

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	Re: Another P.I. link « Reply #125 on: September 08, 2011, 06:29:03 am »

Actually that was some time ago but now with all the free software and data sheets plus all the forums that are on the net it's quite easy to get started and have something working in a very short time by that I mean no more that 10min. Did you have a look at FlwoCode4.0? you can have a free version from them (Matrix) and I think that you will love it (Just the thing to get started) you will be making nice programmes within a few days of getting it.

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	Re: Another P.I. link « Reply #126 on: September 08, 2011, 08:50:36 am »

Hi Mr X
its really late at night here, and very tired but
with my blurry eyes this is what I am seeing right now

I have not completely finished checking your pcb
but I am comparing my published hacked cct with your pcb

but I am having trouble seeing where the resister is
from pin 2 to pin 6 on the tlo71.
and dooley has pin 7 going direct to positive voltage
you seem to have positive going through the 1k (r16)
going to pin 3 which is right, but then pin 3 is going to pin 7

Is that the way you see it ?
its after midnight gotta hit the hay
cheers

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xavier

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	Re: Another P.I. link « Reply #127 on: September 08, 2011, 11:14:21 am »

Yep pin 2 to pin 6 though a 1meg resistor pin 7 and pin 3 are connected together and have a 1k to pos instead of a 1k to pin3 and a 1k to pin7 and then to pos. I have been through this schematic about ten times but just cant find the problem are you guys sure about the component values? this detector beeps at me all the time but if I place a trim pot on the 2nd op-amp (741) pin 1 and 5 she goes quite but have not yet found a setting where she will work so obviously there is a problem in that part of my circuit just can't seem to be able to pin point it right now (Blimey looks like another late night Grin

)

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DOOLEY1972

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	Re: Another P.I. link « Reply #128 on: September 08, 2011, 12:24:45 pm »

hello 6666 ,

nice franenstien squirrel schematic ,

2nd 4538 is to be triggered from pin 10 of the first , pin 9 of the first no connection,

the original set up still drives the audio ,and this is now 1st sample , which should be in the middle of the curve as shown on my previous post , has to be there to give correct responce to low nickle silver coins,

the neg input to the "led op-amp" goes direct to pin 6 output of u5a, before the resistor,

also the new op-amp at the bottom of your schematic doesn't require the 47k , positive input to "led op-amp" direct to pin6 on the new / extra op-amp ,

the "led op-amp" same setup as i had in mind , simple , so when sample 1 is higher than sample 2 green led lights indicating higher conductivity target .

see you have re-printed the 4066 at the bottom for ease , i'll be "un earthing" a switch on the original and using that.

this idea is based on what i noticed on the scope 2 month's back ,
alu , iron = sample 2 lower than sample 1
gold,nickle based anything,silver=sample 2 higher than sample 1

all looks to easy doesn't it ?? well i hope it works , i rekon it will,
only thing i will say , copper is "iffy" same responce as iron and alu , so i'm going to miss old coins.

hello xavier ,
nice finished board , very nice , tidy layout.
regarding comparitor , only used op-amps as i lots of new ones in my box , and they work well ,

xavier , think ive just worked out what's gone wrong with your detector , nothing major , i looked back at the schematics posted by 6666 based on me describing the mods , i think you may have followed the 1st schematic that i have re-posted below , the first TL071 is showing the + and - inputs wrong way round ,
+ input should be 1k to possitive and the - input with the 1M attatched goes to the double diodes where they join the other 1k ,
as shown in the second picture ive posted (thanks to 6666) , so you could easily cut tracks and pop some links in to correct the problem.

Posted on: September 08, 2011, 12:19:00 PM

hello 6666 ,

regarding the 1K from the TL071 to possitive , tried with and without , and both work the same , the TL071 doesnt seem to care , poss due to the very high input resistance of this op-amp.

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xavier

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	Re: Another P.I. link « Reply #129 on: September 08, 2011, 01:49:47 pm »

Hi Dooley

The way I have it is correct pin 3 071 to 1k to pos pin 2 to the diodes so it's not that. If I remove the 071 it still beeps continuously removed the 4066 and still beeps but if I remove any one of the two 741 beeping stops this leads me to believing that the problem comes from the two 741 just don't seem to find it and what gets to me is that I'm sure that it's something very stupid that I did LOL

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