Sniffer XR-71 Stability

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DBP 2010

	Sniffer XR-71 Stability « on: March 31, 2010, 04:25:58 pm »

Hello to all made the sniffer for its own.

I made two of them with different stability.

The first one is made by the isis layout where you have to change circuit TL062 with a TL072.
All capacitors are metal filmed with smallest tolerance.
Resistors are all 1% metall.

Stability = very good!

The second one i did depends on earlier layouts. The TL062 is in place and not changed through a TL072 type.
Resistors are 5% tolerance. Only the four known resistors for the 4066 circuits are 1%.

Stabilty = very weak!

Did you make similar knowledge withyour sniffer XR-71 ?

Please let me hear from you!

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darkkitten2000

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Miner4 eeTH

	Re: Sniffer XR-71 Stability « Reply #1 on: April 08, 2010, 12:52:14 pm »

Hi,
i do not know which schematics you used, since there are several different in the net. I used one with "bugs cleared out" (1% resistors, i do not remember about the TLXXX) but the damn thing newer worked as it shoud. It was fairly stabil at up to mid sensitivity, but abowe it was more guessing than detecting. I finaly sold it (after some mods.) and i abandoned any further attempts, since DBP is far better (and just as deep if not deeper), and it works reliable. This is ill designed circuit, in my oppinion, a failed attempt to "modernize"/"coppy" similar commercial machine.

regarsd,
d.

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sabloni Topic starter

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	Re: Sniffer XR-71 Stability « Reply #2 on: April 08, 2010, 01:32:26 pm »

Hello darkkitten2000,

thank you for your interest.

Yes indeed , the sniffer is not very stable. A miner4 does it much more better Clapp

Therefore i tested like you before did all possibilities to calm the circuit. Angry

Also up the power mid range as you describe there comes a lot of noise. Violent

The dbp2010 was made by Rolf Wilhelm, and he did it good.
Easy and genious. Waveing

This shows the circuit IC2 4017, which various the timings from the 556. Excellent made.
The result: determine what is under the coil.

This in fact doesn`t provide a sniffer or a delta puls.
Why not?
These circuits were earlier in time. Wise

The DBP is a child about the year 2000.
You can say, it is very young.
Perhaps Mr. Wilhelm has learnt about sniffer`s circuit grave. And did it much better. Pray

Tell me, are you happy about the disc mode of Dbp2010 ? In your opinion, does it really make
practical sense ?
Please let me know!

If someone has an dbp for its own i would appreciate to hear from you, how far you
are satisfied with this detector, as i don`t have made the dbp.

I forgot :

the homepage of the inventor of your dbp:

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www.rowielektronik.de

regards, sabloni Detecting

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darkkitten2000

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Miner4 eeTH

	Re: Sniffer XR-71 Stability « Reply #3 on: April 08, 2010, 02:40:13 pm »

Hi,
the DBP doesn't quite discriminate (the way Miner4 does). The fiters are only used to make it more sensitive on some targets than others, but there is not much difference. I find them most usefoul to quiet the machine faster, and than slowly turn them back, as far as they would go.

Yes, i am wery pleased with this detector and it goes 1m deeper than Miner4, but it fades out faster with less ideal soil conditions, and it will not run anything larger than 1m x 1m coil to get some more. It is also much more simpel to use (user friendly) as Miner4 and also quieter and more reliable (when it sounds, there is most probably metal, with Miner4 this is more tricky) and it is also much, much chipper to built. This machine is definetly worth to build. The Miner4, however has more modern concept but it lacks further developement and much faster electronics (the Atmel's microcontrolers cannot really cope with this in real time) and finer A/D D/A conversion. The pulse generator is well done, thought, and i thought to use it in DBP.

regards,
d.
Oh yeah, you just can't determine what is under the coil by changing the timings. For that the entire discarge curve (under preset voltage) should be integrated and compared with "zero targed" curve, the crossing point of both should be recognised.

d.

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sabloni Topic starter

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	Re: Sniffer XR-71 Stability « Reply #4 on: April 08, 2010, 02:44:32 pm »

Hi darkkitten,

thank you for your advice.
iI think about to build a dbp. Indeed it must be done easier as a miner or a sniffer. But are there still all transistors available in nowadays? I must have a look in our region.
1% resistors must be i think as i know from the sniffer circuit.

regards, sabloni

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darkkitten2000

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Miner4 eeTH

	Re: Sniffer XR-71 Stability « Reply #5 on: April 08, 2010, 02:52:12 pm »

Hi,

use BCs, instead of 2Ns, i only used the original power transistor and the Darlington, there's quite a stock where i got them and since we are practicaly neighbours it will not cost you much if i mail you the missing parts.

d.

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kadous

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	Re: Sniffer XR-71 Stability « Reply #6 on: April 26, 2014, 03:41:44 pm »

Hello to the manager & friends.
its my first visit & post.
A question:
how deep will this sniffer rx71 go deep and can it sniff out diamonds?
elemination of ground magnetics & interferences & effect of poerlines , stability and... ?
kind regards Circle

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hunterfog

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	Re: Sniffer XR-71 Stability « Reply #7 on: April 10, 2015, 05:56:13 pm »

Hi all

iam anew member and iam looking for the schematic of sniffer xr71 which uses the cd 4017 and icm556 as timing and the lf357

thanx for all

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