Pinpointer - Minimax-PP II

[Nandor]

Really nice little project, works on first start.
I have made 2 versions, one with active piezo and another with a tone generator. The passive piezo is taken from my PC and it's driven with a CD4060+64kHz quartz oscillator generating 1kHz square wave for the BC547 transistor and that drives the piezo. The detection distance is about 4 centimeters for each circuit.
It is a very coil tolerant pinpointer, works with many ranges but with different sensibilities.
Here are my files and videos

https://youtu.be/wYtqIjXI6eI Original schematic.

https://youtu.be/OrosRtwkOho With the tone gerenator.

[kt315]

Bernte,areyou reffering tp this one?

http://radionics.ucoz.net/publ/metal...tallov/3-1-0-2

https://www.facebook.com/eddy.com.ua/

[kt315]

http://smartelectronix.biz/publ/slegka_prodvinutyj_quot_malysh_fm_quot_quot_malysh_fm2_quot/1-1-0-3

[nonkapo]

Bernte,areyou reffering tp this one?

http://radionics.ucoz.net/publ/metallodetektory/pinpointer_malysh_fm2v2_s_razlichiem_metallov/3-1-0-2

[bernte_one]

for a simple and good pinpointer build latest Version of malysh fm2 from Eddy71
it hast two tone and is very simple to build

[FatBob]

I made this but didn't have a Peizo with oscillator inside so I modded the circuit a bit;



My first coil using 31 AWG and around 500 turns made 120V P to P at 8.2 Khz. I unwound some
wire and got 160V P to P at 9 Khz. So I rewound with 30 AWG. Now I get 15.5 Khz at 15.7 V.
The range is about 1". But I didn't realize it was a motion device.

So I bought a Chinese designed one on Ebay for $25. Say's it's static mode but claims 1.5"
range and then 10mm on Nickle and 25mm on quarter. Not sure if that's enough...

[kt315]

and what? I again repeat you - THE AUTHOR IS PETRUCHO, RUSSIA. I give DIRECT LINK http://www.md4u.ru/viewtopic.php?f=19&t=6001

[samii]

lay file, schematic looking same with Zomby version.

http://www.hobbielektronika.hu/forum/topic_3027.html?pg=190

[Virdi_248]

Created my minimax, it works great except it gives false signals with moist soil and it was impossible to use in the field.


Any idea to solve the false signals?

[paku]

What is replacement for BC556

[sukri01]

made this.. works fine.. can this be modified to non motion detector?

[sukri01]

hi.. this is my first post here.. does anyone have .lay file for zombie version of pp? thanks

[reiv]

Hi this my variation of this PP, works very well

http://www.youtube.com/watch?v=O-LUq_EeWbU

[anz29]

I finished box and tube coil for pinpointer zomby version, only a few welds, and it is ready for ground test!
Regards

[anz29]

I finished the pinpointer zomby version, it works!
Also if the coil has not 400 turns (copper wire over to 330 turns) The sensing distance is very good, 5 cm above coin 10 euro cents
Tested on bench, now I have to find the box and try it in the ground.
Coil with 70 less turns may damage some components? I can leave coil under these conditions?
Thanks everyone for technical support!
Regards