Hi

[Hach]

Geo can anyone tell me why Smw when I reject ferrite rode its also rejected silver rings?!!

[Nandor]

Geb has to much phase shift, it's too strong!

[Hach]

Geb has to much phase shift, it's too strong!

Phase Resistor 1.8k. Should I change it?

[hooby life]

can use lm7812 regulator instead of 7809
regard..

[Vadim18]

can use lm7812 regulator instead of 7809
regard..

You can try to use, but, you need at least 2 things - battery with 14 volts minimum voltage (idealy 4x li-ion cells) and CD4053 only, not 74HC4053 or it will overheat. But I think 74HC4053 will work better than CD version, but offcourse will work only with lm7809 regulator.

[Hach]

It is 27k as noted.

Quote Originally Posted by smity View Post
Ivconic, you have the last circuit (post number 520) r2 - 2k7, 27k on the circuit board. Which is correct? And tell me. Possible to set the adjustment "thresh" on the LM358, and the "sense" to remove? I think it will be continuously adjustable sensitivity. Sincerely.
It is 2K7, sorry for the mistake!
Possibly yes. It is also good solution.
You can change R37 value or put trimmer instead to see the difference.
Also i think that 555 stage can be improved further
Are you sure is it 27k!!!

[ivconic]

I do trust my own archive from hard disk.
I do make SMW every once in a while, respecting the schematic and pcb that i have.
What to answer?
I don't think too much on SMW concept any more.
I just repeat the diy without much of a thinking. Since it is proven and works alright.
But nobody stops you to experiment and try any other solution.
That is very good way to learn and progress.
It doesn't really counts what i say here, it counts only what you find that works for you.
Go ahead and do it your way. I can only salute that.

[Hach]

I do trust my own archive from hard disk.
I do make SMW every once in a while, respecting the schematic and pcb that i have.
What to answer?
I don't think too much on SMW concept any more.
I just repeat the diy without much of a thinking. Since it is proven and works alright.
But nobody stops you to experiment and try any other solution.
That is very good way to learn and progress.
It doesn't really counts what i say here, it counts only what you find that works for you.
Go ahead and do it your way. I can only salute that.

Regardless if I made the smw in proper way or not at least I get 20cm for coin in the ground. And I learned alot
I used both 2.7k and now I am using now 27k both are working I asked only to be sure don't worry about it.
Really I don't know how to thank you it's the best diy project I had ever try
You are honest man.
Regards.

[ivconic]

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

[Hach]

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

[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

[gurdal]

SMW

Hi
pcb ready for testin

[hooby life]

Hi
pcb ready for testin

Nice gurdal

[hooby life]

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

[Pompey]

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