Hi

[gurdal]

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:

hello ivconic master.
we upset you with questions,
connected circuit worked.
thank you

I'm having trouble with the coil
tx 1,09 mh rx 15,29 mh
How many cm should be 1e depth test
what is the tx and rx frequency that should be.
what is the frequency value between the two coils.

sorry for the questions

thank you so much

[gurdal]

Hi,
ib detectors tx high rx low frequency
we know as.
smw detector is just the opposite, rx high tx low
Is this true?.
Or did I get it wrong?

also what is the net coil information capacitor information of this circuit.

Best regards

[hooby life]

Look at shema

[hooby life]

It is 0.47uf

[gurdal]

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.

[ATTACH]49385[/ATTACH]
[ATTACH]49386[/ATTACH]

Hi ivconic
C30 in circuit brings up the "bell tone", similar as at Garret's. Very effective at some type of targets. ?
1)What is C30 capacitor value
2)can you mark it on the c30 pcb

Best regards

[gurdal]

Hi
1.smw worked very nicely.
2.depth is very good.
3.no nonsense signal.
4.I wound different coils.
5.iron core does not wipe aluminum foil.
coil:
TX-1.06mh 0.50mm
RX-15.14mh 0.30
I had no problems with 1st and 2nd smw before.
where can i be wrong
does not choose metals
Please help me

[hooby life]

Hello friends;

the device is working,
depth is very good.
on the other hand
I tested different coils,
ferrit silindiğinde
no metal detection
what is the problem?
Best regards

Look coils d?tails in thread smw ...

https://www.geotech1.com/forums/showthread.php?13392-Serbian-quot-Most-Wanted-quot&p=104604#post104604

[gurdal]

Hello friends;

the device is working,
depth is very good.
on the other hand
I tested different coils,
ferrit silindiğinde
no metal detection
what is the problem?
Best regards

[Pompey]

No,337 is npn,327 is pnp ,you can use bc557.

[hooby life]

Can i use bc337 instead to bc327 in this circuit ?
Because i have not bc327 hfe l'ESS than 320.

[hooby life]

Hi
pcb ready for testin

Nice gurdal

[gurdal]

SMW

Hi
pcb ready for testin

[gurdal]

Hi

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 hello I want to start the project

Is the PCB drawing slightly curved?

is this normal?

Best regards

[Hach]

First hunt with Smw 25cm in the ground
I don't know what it's look like a mine

[ivconic]

Thanks.
Yes, SMW rocks!
Considering that it is still simple and obscure circuit.
But can be trimmed to work very good.