why without parallel capacitor the distance is 1.2 meter and with the capacitor it decreases?
I need a stimulator schematic ???

MY PD :D

https://ibb.co/qYwCw5K

Very Stimulator schematic have in this forum search for it,
When you take cap from paralell Coil . Your coil not is without Cap. , Input of your Device have self capasitor . pf . and with it have on high Freq. Resonant . Khz , Mhz.

Thank you !

2 meters from 1.5 battery spark without stimulator , passive receiver modified :D:D:D

Thank you good project

https://6.top4top.net/p_1416ranbf1.jpg

Why use a 5V voltage regulator?
https://2.top4top.net/p_1421v8esm1.jpg

Why use a 5V voltage regulator?
https://2.top4top.net/p_1421v8esm1.jpg

For better stability.
This project has very critical adjusment so we need very good stability.

Thank you
I see a C12 capacitor connected to the ground has nothing to do:lol::lol::angry:
The capacitor C4 inverted electrodes:lol::lol:

Was not me who designed this schematic :lol:

Do 50UH coils are good
https://2.top4top.net/p_14224ddm11.jpg

I never constructed this version by Andreas so i don't know what coils he used or what mods he made.

Thank you so much
I do not mean reception coils 56T 56T
Coil 433MHZ !!

https://www.youtube.com/watch?v=-CjQBwaV8FY:lol::lol::lol:
Calibration is very difficult, maybe just put the coil in the middle:lol::lol:

Good day
As many, interested in ? Alonso PD ? which is modified and dedicated by Mr.andreas Christi
Built one and studied.

Above all, I must say that Mr.anreas Christi from Greek is an honest, hardworking, social person and his device works, but I think works regionally. Depends on conditions.

Here is the result:

Alonso-Andreas PD can NOT detect either old buried or fresh gold target from far in any regions or area.
There is NOT any zero or magic or golden point which can be tuned by plastic screw or other micro stepping adjustment technic.
Ferrite rod and a coil, obviously result a radio signal receiver and Mr.christi accidentally
Is receiving some sort of signal (probably UHF) which has effect on Gold target. PD transmitter has NOT effect.
What does it mean? If you notice to recent product by Christi (pocket gold detector), it is just a receiver In UHF band and has no transmitter.
Means, if you live in an area which there is not any UHF band signal transmitter, your PD can not detect any gold target from far.

PD transmitter produces approx. 180 KHz sinusoidal frequency. (it is much like damped wave)

Receiver by capacitor value in schematic, tuned to approx. 77 KHz. (75 KHz to 79 KHz variable by moving coil on the rod)
Do you see any relation between those numbers? (personally I do not)

also there is a 15 Hz low-band-pass filter in the receiver circuit which does not let other higher signals pass to detection part.

Overall, do not know what UHF frequency has effect on fresh and old gold target and why this Contact produces 15Hz and below. (beat frequency or ?.)
But I think without UHF in your area, no hope to your PD able to detect gold.
as myself in iran-shiraz city, which since several years ago, UHF signals stopped by TV channels and all became digital.
Also, I informed that there is no UHF TV transmitter in the middle east. at my country very limited Still in the capital. Other area is empty. So, not only your home-made PD will not work in all regions but also factory-made may not work.

Important: UHF concept and effect, borrowed from andreas Christi videos published on youtube.

Any comment, appreciated and welcome.
Please correct it if I am wrong. Thank you

Here is a few pictures:

http://s12.picofile.com/file/8400308368/pd_tx_coil.jpg
http://s12.picofile.com/file/8400308..._coil_size.jpg

'' product by Christi (pocket gold detector), it is just a receiver In UHF band and has no transmitter. ''

Hi Behnamvp , My interest is for Pocket GD, does You have Photos from it . ;)

PGF170 Gold Detector by Andreas...

Hi GOLDEN LILLY ,
So like only Receiver in UHF Band , Does works good or Find any Buried ?
You Try this device?