Felezjoo Pi- adjusting automatic delay, A,B and C values to perfection!!

[Nightryder]

I made this video a while ago giving some tips on building felezjoo

No changes were made to the components, everything as per the original scheme.

https://youtu.be/wNTOqbBnwO0?si=CKJNO_AEHA9JtsRV

What a coincidence!!

I actually just found out that your video was saved in one of my playlists.

I even remember there was a link in the comments section by you. Which I used to buy a couple of 357 op-amps. and yes they were not fake but they gave me lower numbers just as many others I bought before and after from different sources.

I have to say that I was kind of frustrated with this project until I came across your video and some other info. Knowing that I have as same op-amp as yours suggested that I should shoot troubles somewhere else. long story short, that's how I figured out what was wrong with it.

Thank you so much!

[Tanu]

In my region I have a problem with all detectors, there is a lot of iron stone.
I used felezjoo pi this 20cm spider coil gain reduced by less than half it performed like the other DIY detectors I assembled.
I have doubts if gb really works, maybe not.

I have same doubt
Why do you doubt whether gb works or not
What are the reasons?

[Nightryder]

In my region I have a problem with all detectors, there is a lot of iron stone.
I used felezjoo with a 20cm spider coil. gain reduced by less than half performed like the other diy detectors I've assembled.
I have doubts if gb really works, maybe not.

If you mean by gain sensitivity, I can understand if reducing it not going to help much. Try to lower the speed setting and see how that works for you

[Emersonpaz]

If you mean by gain sensitivity, I can understand if reducing it not going to help much. Try to lower the speed setting and see how that works for you

Yes, sensitivity reduced by less than half, so all other detectors have to reduce sensitivity when bringing the coil closer to the ground.
Tanu I have doubts about the gb operation because I didn't notice any difference in the behavior on the ground similar to that of a Polish pi.

[Nightryder]

Yes, sensitivity reduced by less than half, so all other detectors have to reduce sensitivity when bringing the coil closer to the ground.
Tanu I have doubts about the gb operation because I didn't notice any difference in the behavior on the ground similar to that of a Polish pi.

I know for a fact that temperature (and maybe other conditions) can change the inductance of a naked coil, so if your coil still looks as in the video, you might want to consider some sort of insulation like a foam spray. It wouldn't hurt if you also consider shielding it (No aluminum shield as the author repeatedly mentioned)

Best of luck!

[Tanu]

Yes, sensitivity reduced by less than half, so all other detectors have to reduce sensitivity when bringing the coil closer to the ground.
Tanu I have doubts about the gb operation because I didn't notice any difference in the behavior on the ground similar to that of a Polish pi.

What do you think about the polish pi(I think you mean polone pi).
is it better than Felezjoo pi any advice please