NEXUS circuit diagram

[ivconic]

Refering to 1220B;

Yes you are right. Problem was ocassional drift, when adjusted on high sense...Walking forward, from time to time gnd signals appeared...But that is the price i had to pay! Benefit was fact that no item was missed...Pretty soon i had to make some compromise, get tired of often adjusting/reseting (damn reset knob)...My thumb was in pain!
I was thinking to more closely examine that machine and try to improve it somehow....Problem is i dont have schematic! To tell you the truth, i am to lazy to trace it out now, these days, when we have so much better schematics available...
Another nice thing at 1220B was tone disc. Lowe tones for iron&simillars and higher tones for "coloured" metals. Ig geb adjusted well, that tone disc. works perfectly well!
It is shame that we dont have here some schematic simillar to this!
To switch forward, next interesting thing i saw at BH Tracker 505/1...small,cheap...but motion detector with tone disc. too! Would be good to use that stage from it and apply to some better machine (i have TGSL on my mind...heh,heh,heh...)
Regards!

[Max]

I have a Bandido, and it could not possibly pass the cache test.
Anyway, why don't you ask Carl? He most likely has a Tesoro in his collection.
TGS is an older Tesoro design, but they all have similar performance. Also you need to remember that the detector must be in discriminate mode when performing the test.

In answer to your second question - none of the Nexus detectors have a non-motion mode. On the Tesoro it is used for pinpointing, but in practice I don't find this a very useful feature.

Hi,
already explained by Ivconic.

Sure an original setup machine with original coil can't pass the cache-test.
All we know that.

I was referring to a TGS-clone or TGSL version with large DD coil of 10''.

Only way to test is building one pcb and one coil like described, with same performance we are talking about and repeat the test on coins jar at 24''.

10'' DD coil is a medium size coil and even if we can't compare TGS with Nexus/8''OO directly we'll at least know if TGS with that coil pass or not the test.

Have you made that test using Nexus ?

I explained that for me TGS/10''DD can do... but I think just in medium soil (easy).

Best regards,
Max

[Qiaozhi]

Hi,
already explained by Ivconic.

Sure an original setup machine with original coil can't pass the cache-test.
All we know that.

I was referring to a TGS-clone or TGSL version with large DD coil of 10''.

Only way to test is building one pcb and one coil like described, with same performance we are talking about and repeat the test on coins jar at 24''.

10'' DD coil is a medium size coil and even if we can't compare TGS with Nexus/8''OO directly we'll at least know if TGS with that coil pass or not the test.

Have you made that test using Nexus ?

I explained that for me TGS/10''DD can do... but I think just in medium soil (easy).

Best regards,
Max

I have not tried the cache test myself because the soil here is heavily iron infested. Georgi told me that the Nexus with the Ultima coil has no trouble detecting it, but (of course) that's what it's designed for - cache hunting.

Originally I think we all believed that a jar of coins buried at 24" (61cm) would be detectable by several detectors. However, in both Georgi's and Carl's tests we were proved wrong.

The problem seems to be related to the coins being separate items and not one big lump. If you take something like an OXO tin lid (for example) which is 5.5" x 3.5" (14cm x 9cm) this can be detected more easily than the cache.

[Unregistered]

Nexus

Coil and shematique:
http://www.md4u.ru/forum/viewtopic.php?t=1312

[Qiaozhi]

Nexus -NOT

Coil and shematique:
http://www.md4u.ru/forum/viewtopic.php?t=1312

This is the not the Nexus schematic.

[tiktak]

Hi

Hi,
Ok this is not nexus.
But its look like this a working MD close to nexus.
My question is what copacitator should I put in coil?
Thanks

[Qiaozhi]

Hi,
Ok this is not nexus.
But its look like this a working MD close to nexus.
My question is what copacitator should I put in coil?
Thanks

It is not close to the Nexus. The transmitter circuit is not even the same.

If you know the operating frequency, then it is a simple matter to calculate suitable values for the coils and tuning capacitors.
Simply use: f = 1/(2pi*sqrt(LC))

[Unregistered]

"...dirty rat,dirty rat!"
Protected specie...i presume?
To many overtones here, that's why signal is unuseable at all!