LOOKING FOR DETECTOR TO BUILD

[evia]

hi everybody from greece thats my first post here great job everyone!!! as i said in the title im looking for scematics to build. my interest is gold coins from 2nd world war the max depth i need is 1 meter any suggestions??? thanks in advance

[Delbert grady]

Prey

[Guard]

Hi from George Thessaloniki.
A very nice pulse detector is "delta pulse"
with 45cm coil detect a gold coin to 50-60cm
with 1x1m coil detect an iron plate 20x20cm to 170-210cm
In the ground a metal boiler 50x100cm i detect it in 270cm !!!

[Geo]

Hi from George Thessaloniki.
A very nice pulse detector is "delta pulse"
with 45cm coil detect a gold coin to 50-60cm
with 1x1m coil detect an iron plate 20x20cm to 170-210cm
In the ground a metal boiler 50x100cm i detect it in 270cm !!!

How many turns has the coil of 1x1 m and how many turns has the 45 cm coil?
Regards from Karditsa

[Guard]

hi GEO.
THE 45CM COIL HAS 16 TURNS WITH 1.5MM POLIKLONO R=660 OM
THE 1X1 COIL HAS 13 TURNS WITH 2.5MM POLIKLONO R=1.5 KOM
FREQUENCY 150-250HZ
I=1.2AMP

[Geo]

hi GEO.
THE 45CM COIL HAS 16 TURNS WITH 1.5MM POLIKLONO R=660 OM
THE 1X1 COIL HAS 13 TURNS WITH 2.5MM POLIKLONO R=1.5 KOM
FREQUENCY 150-250HZ
I=1.2AMP

Hi. What are you mean R=660OHM or 1.5K. With 1.5mm or 2.5 mm wire the resistance must be 0.3 Ohm max. Who current is 1.2 A? The averange is 75-100 ma at my delta pulse.
I tried a coil with R=0.3 Ohm and the detector was unstable so i connected a resistor 2 Ohm in series with coil.
F=100 Hz
Regards

[evia]

THANKS GEORGE.. THANASIS ISTIAIA EYBOIA THE SCEMATICS ARE INSIDE THE FORUM? IS IT EASY TO BUILD THE NUMBERS YOU ARE DISCRIBING ARE FROM YOUR TEST THANKS IN ADVANCE

[kt315]

very nice. do it.
http://www.thunting.com/geotech/page...Hv1p3_300c.pdf

[Guard]

The battery is sealed lead 12v/1.2A.
The current of delta pulse is 100-120mA.
The resistors is for coils dumping.
The IRF740 has a resistor in series 1ohm/1w to gnd.