PROJECT ETI566

[Baterista]

Thanks for your help in making the coils will get more help

Detail of the secondary coil of the transmitter.
206 1/2 turns (6 1/2 + 35 + 165).


Detail the primary. Two lengths of wire paralleled.


The others coils has the similar construction.
Measurements taken with the coils inside the potcore

[zixelll]

Thank you my friend how to wrap the two coils so.

[WM6]

Thank you my friend how to wrap the two coils so.

This have to be easiest part of whole construction. Thanks to transformer used, coils are one wire loop only.

[zixelll]

Winding means that you have the right figure for the third winding circuit used the same formula in the form described above, thank you

[Baterista]

If you are referring to the L2 (receiver). The scheme is the same winding suggested above;
225 1/2 turns
1 step initial point
2 step + 25 1/2 turns - 2.20 uh
3 step + 200 turns - approximately 16 mh.
Measurements taken with the coils inside the potcore.
There is also the "adjust" for the potcore, as may be seen in the image.


detail

[zixelll]

Thank you so much my friend I'm living in Iran as sanctions here we're not gonna take this size pot core pieces to be stuck on the easier to remember

[mindfree]

Thank you Baterista for your post!
I can only get ceramic trimmers upto 70pf in my place.
Did you use FM Tuning Capacitor-Gang Capacitor for trimmer ? Do they have any capacitance value mentioned?
Can you suggest where to get trimmers?

Also i can't find Q4, Q5, Q7 - BC559/BC179
Any substitutes?
Thanks!

[Baterista]

Thank you Baterista for your post!
I can only get ceramic trimmers upto 70pf in my place.
Did you use FM Tuning Capacitor-Gang Capacitor for trimmer ? Do they have any capacitance value mentioned?
Can you suggest where to get trimmers?

Also i can't find Q4, Q5, Q7 - BC559/BC179
Any substitutes?
Thanks!

Yes, I used this variable capacitor for tuning FM radio(scrap parts), this type of component is not easy to find in stores,
they are usually for 350 to 450 pF, looking at the picture there are 4 capacitors, each with a different value
(C1, C2, C3 and C4), in my measurements I C1 and C2 always found above 250 pF and C3 and C4 of 50 pF below,
measurements are made with the "COM" on the leg between C1 and C2.
As for the BC559 is an silicon transistor PNP common use, may be substituted by;
BC559, BC557, BC513, BC514, BC560, BC214, BC309, BC259,
2SA709, etc..


Leg used as a "com" measurement.

[mindfree]

Thanks you!
Will this detector work near a radio station broadcasting AM / FM?

[Baterista]

Thanks you!
Will this detector work near a radio station broadcasting AM / FM?

I think not, I have not had this problem, but high voltage cables and transformers can cause interference.

[Geo]

If I understand the question well. Concerning to depth:
My field tests are done in the same place for all projects.
Pieces of iron, forming a block of 17 cubic centimeters, buried one meter deep.
And for this project has a clear and strong signal.
Has not yet been made a maximum depth test.
Need to dig, dig, dig ...

Hi.
Congratulation for your project.
Before many years i constructed it. It was a good project with good depth but not magic results.
I compared it with a Gemini III and the gemini was better so i keep the Gemini and let it.
Again congratulation for the so good constuction

[WM6]

Hi Baterista

As far I remember you post a photo of whole detector in your first post here. I don't know if it is only on my browser, but I cannot see those photo any-more?

[Baterista]

Hi.
Congratulation for your project.
Before many years i constructed it. It was a good project with good depth but not magic results.
I compared it with a Gemini III and the gemini was better so i keep the Gemini and let it.
Again congratulation for the so good constuction

Thanks Geo, I will soon post more results and maybe a video.

[Baterista]

Hi Baterista

As far I remember you post a photo of whole detector in your first post here. I don't know if it is only on my browser, but I cannot see those photo any-more?

Yeah, I do not know what happened, I thought the image had disappeared only to me, anyway I'll repost the photo.

[Geo]

Yeah, I do not know what happened, I thought the image had disappeared only to me, anyway I'll repost the photo.
[ATTACH]22336[/ATTACH]

Yesssss..... perfect!!!!!!!