felezjoo PI(the best pulse induction metal detector that I made until now)

[kt315]

connect the stick to cold end of the coil, ie to power supply line. ground the coil socket, inside the housing. then by wire connect steam to the socket.
remember, your body/hand must be isolated from the stick.

[useus]

After replacing the coil cable with a higher quality one rg58 (I already had rg58 but poor quality, now it also detects gold) a strange thing happens: by rolling the cable on the metal detector stick the signal is unstable, it sounds alone and reaches around +25 / - 25 depending on the situation, instead leaving the cable free, only fixed in the upper part, does not cause balancing problems. The abc values are almost perfect. I have been using the metal detector for about 2 years. Latest firmware with counter.

[Tanu]

Another problem with the metal detector
When I touch the battery terminal, circuit or black area it becomes unstable. The lcd shows a negative number and when I remove my hand from the md. md gives the target sound & show in lcd

Below I will put a picture of the ABC numbers

[Tanu]

I think he’s talking about hum from the coil not from speaker. Yes is normal, if you change the frequency you will notice hum change in pitch, is the resonance of the coil.

Thanks for your reply

Yes, that's what I meant. For the first time I don't hear that sound.
After many days I heard that sound for the first time

[Tanu]

Tanu do you hear the hum only when you move the coil above ground or does it make the hum even in the air?
Have you washed your PCB with Isopropyl Alcohol?

Thank u

No i can't find 99% isopropyl in this time.but i cleaned using 70% IPA

[MDfanatic]

My bad, I didn't read his post carefully.

[ionut_mtb]

I think he’s talking about hum from the coil not from speaker. Yes is normal, if you change the frequency you will notice hum change in pitch, is the resonance of the coil.

[MDfanatic]

Tanu do you hear the hum only when you move the coil above ground or does it make the hum even in the air?
Have you washed your PCB with Isopropyl Alcohol?

[Tanu]

Hi
felezjoo is my first md
any one can tell me why felezjoo metal detector coil get hum sound?
is it normal?

[durmaz]

Zemin dengesi dengesiz. Zahmet etmeyin.

[sbalio1]

Good i just hsve image for it .

[YIVANKA]

I’m looking for it.

[sbalio1]

Hi yivanka Can you put this pcb faile or sand [email protected]

[MDfanatic]

YIVANKA nice, what are your ABC numbers?

[YIVANKA]