Wanted "ADMIRAL"

[Nandor]

Hi
Its good to check the signals produced by the circuit, like Tx and Rx or phase shifters output but you need a 2 channel for tuning the coil. Or you can use a multimeter to tune the coil.

[Zotchin]

Is this small oscilloscope enough or not for working

[Nandor]

Looks promising Forged nails are very hard to discriminate even with a Tesoro.

[CEBRAIL]

https://youtu.be/jo3N1lHQT6k

[CEBRAIL]

https://youtu.be/XQCOBVuiYdo

[Zotchin]

Yes, I think the LMC6484 is impossible to find
Every day we wait for work to finish
To hold everything necessary and sometimes the day passes in vain

[getsa]

I doubt that with LF347 the detector will work correctly.

[Zotchin]

Hi Zotchin
Change the quad opamp LM324 to LMC6484 or LF347 and you will have a better detector.

Great. thank you for help
I'll tell you the what is the deference.

[Nandor]

Hi Zotchin
Change the quad opamp LM324 to LMC6484 or LF347 and you will have a better detector.

[Zotchin]

Yes, you are right, especially about capacitors. I welded a socket to replace it. And in the crucial moment to discover the difference, the battery was depleted

[getsa]

Try to select ICs(opamps). Based on my previous experience there were situations achieving different results during experiment different opamps (pcb with sockets). Another suggestion is to experiment with different capacitors replaced paralel on Tx coil. The distance and threshold are changed sometimes significantly.

[Zotchin]

You should be able to hear that coin at 24-25 centimeters.

Good distance but hard to do it

[Zotchin]

Tx1.162 MH 428nf 7.137khz rx8.60mh. 48nf 7.833 kHz txrx696hz

I didn't measure rx frequency
Good point I'll try it

[getsa]

You should be able to hear that coin at 24-25 centimeters.

[CEBRAIL]

Your goal is 35cm ok. For what?
I build this one in the picture it is 2 tone by nikko i guess
In air test i catch a coin 14mm between 15 and 17cm look picture . Is it good or bad?
My language is arabic if you understand it will be good
Maybe i will try to change some things

Rx 08milivolt