Wanted "ADMIRAL"

[Zotchin]

how to mesure 5 mv in rx and how to reach it
i need some help
actuly i wante to increase the detection destance
thank you

[CEBRAIL]

how to mesure 5 mv in rx and how to reach it
i need some help
actuly i wante to increase the detection destance
thank you

Tx 1.162 428 nf. Rx 8.60. 48 nf

[Zotchin]

Tx 1.162 428 nf. Rx 8.60. 48 nf

Thank you very much

[CEBRAIL]

tx 1.162 mh 428 nf rx8.60 mh 48 nf.close to 800 hz l kept the rx frenzy high. ln 12 cm brick. successful.soil trials 22 cm. my goal is to reach 35 cm

[Zotchin]

tx 1.162 mh 428 nf rx8.60 mh 48 nf.close to 800 hz l kept the rx frenzy high. ln 12 cm brick. successful.soil trials 22 cm. my goal is to reach 35 cm

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

[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

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

[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

[getsa]

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

[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

[Zotchin]

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

Good distance but hard to do it

[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]

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

[Nandor]

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

[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.

[getsa]

I doubt that with LF347 the detector will work correctly.