Malysh FM

[Eddy71]

Thank you, everything will be fine, I'm sure.

[bernte_one]

BIG thanks to Eddy71

whish you all the best, not easy time in lugansk

[Eddy71]

This schematic not work with ferrite rod, only with simple coil. You make magnethometer.

[yo4hfu]

In this morning i made a new test with PP (version without external oscillator & last firmware). Again the same problem of instability was appeared...Is not a mechanical instability. Everything is good in fixed position but when i go outside in my garden and i make a new self calibration, the PP is stable only if i hold same azimuth.
PP is stable if i hold this first position and i walk around. If i rotate slowly left/right, the PP response with metal/nonmetal signal. Is exactly like a magnetic compass. The frequency is shifted by earth magnetic field, i don't have other explication...

My coil has 1,25mH, this value is from original schematic. Self calibration procedure is passing without error, this mean a good frequency of the oscillator. Frequency is 18,75KHz.

I my area i don't have perturbations from high power VLF-LF transmitters or other radio sources.

[Eddy71]

Look for my new version of "MalishFM"

http://smartelectronix.biz/publ/rabota_nad_oshibkami_malyshfm_samyj_prostoj_v_mire_selektivnyj_metalloiskatel/1-1-0-75

and "MalishFM v2"

http://smartelectronix.biz/publ/prostoj_selektivnyj_metalloiskatel_malyshfm2_rabota_nad_oshibkami/1-1-0-74

Fast start and greater stability.

[bernte_one]

hello yo4hfu

is the coil inductivity correct? as i remind the versiond i build has around 2250µH

[yo4hfu]

Thank you Toros, you give me a fast and useful response. I changed the firmware with "MetFM_v2_675.hex" and now the stability is very good, "magnetic compass effect" disappeared.
All the best!

[Toros]

This is a old thread but i have one question about this pinpointer. I build malysh-fm first version (without external oscillator). On the table everything is ok, good stability and sensitivity but outside my pinpointer response like a magnetic compass . It has a high sensitivity regarding magnetic field of Earth. Is very easy to identify the N-S direction.
The coil use 5cm of ferrite core from AM radio. Inductance is 1,25mH and i have same results with/without static shield.
Has anyone noticed this problem?

The main problem with this PP is that the detector must be firm and rigid all the details, including the battery and cables for connecting the battery and antenna. The detector responds to each movement of elements in the box. The author admits that the first version of the software have bugs that he is now corrected. If you read Russian, you can see here:

http://smartelectronix.biz/publ/rabota_nad_oshibkami_malyshfm_samyj_prostoj_v_mire_selektivnyj_metalloiskatel/1-1-0-75

New software is here:

http://smartelectronix.biz/load/0-0-0-64-20

[yo4hfu]

This is a old thread but i have one question about this pinpointer. I build malysh-fm first version (without external oscillator). On the table everything is ok, good stability and sensitivity but outside my pinpointer response like a magnetic compass . It has a high sensitivity regarding magnetic field of Earth. Is very easy to identify the N-S direction.
The coil use 5cm of ferrite core from AM radio. Inductance is 1,25mH and i have same results with/without static shield.
Has anyone noticed this problem?

[paku]

https://www.youtube.com/watch?v=AA-97Rr2TzY

you can see pcb some seconds at end of Video

ask user Württemberger here via personel mail
he worked out a new design of pcb with integrated charger

he also published a Video
ask him for the link

ok thanks bernte_one

[bernte_one]

https://www.youtube.com/watch?v=AA-97Rr2TzY

you can see pcb some seconds at end of Video

ask user Württemberger here via personel mail
he worked out a new design of pcb with integrated charger

he also published a Video
ask him for the link

[paku]

THANKS
1 BUT I NEED DRAW LAYOUT SCHEMATIC FROM KT135 FIRST

[Eddy71]

In post#6 second version of hardware with external oscllators.

try this firmware

[paku]

THE RIGTH schematic in my post #6.

THANKS MR. KT315 I WILL FOLLOW YOUR SCHEMATIC NOW!

[kt315]

hahaha im still dont have luck not working
i using this schematic
firmware v2 v3 v4 v5 huhuh all not working when turn on
silent no sound
huhuhuh

[ATTACH]32203[/ATTACH]

THE RIGTH schematic in my post #6.