Hi

[hooby life]

Jewelry as such earnings, chains with small links and similar; are presenting horrific targets for most of the common detectors.
Any awkward shapes that disperses the eddy currents like that.
SMW is not the exception. It will struggle with such targets.
But it will perform very good on targets like coins, rings and similar.
SMW is one of the "deepest" diy i ever made. General purpose nature. Usual targets in our hobby.
In my case; coins. Ancient coins, mostly made of bronze and similar alloys.

Ok that s good.
Which best version of smw you suggest to me ? The deepest ?

[ivconic]

Ok that s good.
Which best version of smw you suggest to me ? The deepest ?

The prime one.
Ok, now you pulled out from me the latest bijou!
Which i never intended to share here!
Let it be the treat for this month:

[ivconic]

C30 and C32 are not present on pcb draw.
Those are optional.
Try them, if you like them; keep them.

[MartyJ1963]

Hiya Ivconic,,,Thanks for sharing the SMW layout,,,Could you let us know the Coil Data for this pcb please and Frequency,,Thanks in advance. Regards, Marty.

[MartyJ1963]

Hiya all,,,Thanks again Ivconic for the SMW Layout,,,,Can anyone tell me the value of the Capacitor in the picture please? I've been Looking forward to making this S.M.W for a couple of years now for my collection,,Also, if anyone knows the TX and RX frequencies so I can have a go at making the coils,,,Much appreciated, Regards,,,Marty.

[ivconic]

Hiya Ivconic,,,Thanks for sharing the SMW layout,,,Could you let us know the Coil Data for this pcb please and Frequency,,Thanks in advance. Regards, Marty.

Coil specs close to specs of Minelab TS1000 coil.
1mH TX and 15mH RX.
Although SMW is tolerant and can be trimmed also with bit different coil specs too.
Frequency can be 6 to 8kHz.
Capacitor is 100nF.

[ivconic]

After so many years i am still making SMW, every once in a while, whenever i have chance to obtain TS coil (rare lately), since i am to lazy to make diy coil anymore. Pretty fed up of that labor.
So i finished this one last week. It is working "by the book", excellent, indeed deep and sharp!
I had extra housing, laying in a drawer for long time, so i draw pcb to match that housing.

[ivconic]

Additional infos,
i used toggle switch 2x3 with center position neutral, to switch ON the detector either with C30 in circuit, either C30 out of circuit.
C30 in circuit brings up the "bell tone", similar as at Garret's. Very effective at some type of targets.
Saves me from using another switch for tone option.
Also there is a diode bridge acting as battery reverse polarity protection.
This is particular case, not general, since i made this detector for one friend who is often careless and already burned several detectors with reversing the polarity at 12v/1.3A battery.
So i had to figure out how to prevent that.
Ok, there is small and insignificant voltage drop at bridge... not presenting any problem and not affecting detector behavior at all.

[Nandor]

Looks very nice, thanks for sharing your work!

[ivconic]

Looks very nice, thanks for sharing your work!

No sweat.
There is always something "rolling" and "hanging" in my workshop.
It's the life style more than anything else.
SMW is simple and obscure but very usable and worth to be made.
It is the funny Fisher 1235/ White's Classic combination.
Funny on paper but very serious performer on the field.

[MartyJ1963]

@Ivconic-Thanks for sharing the extra information,,much appreciated as always. Really looking forward to building this but I have to order some new pcb clad yet, as I only have 100mmx70mm, so will gather the rest of my parts in the meantime,,Thanks again, Regards, Marty.

[ivconic]

@Ivconic-Thanks for sharing the extra information,,much appreciated as always. Really looking forward to building this but I have to order some new pcb clad yet, as I only have 100mmx70mm, so will gather the rest of my parts in the meantime,,Thanks again, Regards, Marty.

If you can not obtain Minelab TS1000 coil, which is really hard lately; you can make your own coil, with slightly different specs, yet very suitable for this detector.
RX=160 windings, 0.27mm wire
TX=70-75 windings, 0.45mm wire
In this case TX parallel capacitor is 220nF.
Former same as so many times so far explained coil former for TGSL.
I think Don Bowers did much better job in his PDF than me in my PDF, about making such coils.
Look up through the forum for his PDFs , to see the proper dimensions of "D" shapes.
Coil shielding goes to minus rail.

[MartyJ1963]

Thank you Ivconic. Could you please tell me best frequency for the S.M.W Coil?,,,I am still learning (but getting better) about DD/Concentric tuning at the moment on my O'scope. I am ok now at building VLF Coils to spec now I have a decent LC Meter (DE-5000), sometimes this new meter confuses me though because it tests at different frequencies (1khz/10khz/100khz/10hz/120hz) and apart from know to test Electro Capacitors at 120hz I don't know which frequency really to test my VLF Coils because different frequency settings give slightly different values,,as I said, still learning but enjoying this great hobby. Thanks again,,Regards,,Marty.

[ivconic]

Thank you Ivconic. Could you please tell me best frequency for the S.M.W Coil?,,,I am still learning (but getting better) about DD/Concentric tuning at the moment on my O'scope. I am ok now at building VLF Coils to spec now I have a decent LC Meter (DE-5000), sometimes this new meter confuses me though because it tests at different frequencies (1khz/10khz/100khz/10hz/120hz) and apart from know to test Electro Capacitors at 120hz I don't know which frequency really to test my VLF Coils because different frequency settings give slightly different values,,as I said, still learning but enjoying this great hobby. Thanks again,,Regards,,Marty.

7.3-7.7kHz

[MartyJ1963]

Thank you sir,,You're a star! Regards,,,Marty.