Delta Pulse

Thank you Willy ans Alexis

Hello Willy and Alexis,

Thank you both for your answers. No, i'm not use to search cans of coke but for me is a good reference for medium objects. And money depends of the country where you are. But for example with euros i obtain :

5 cents ==> 19 cm
10 cents ==> 17 cm
50 cents ==> 21 cm
2 €uros ==> 20 cm

For make the coil, i have use the following formula of inductance for flat coil :

L = (µ0 x N² x S) / (2 x R)

Wich one become

L = (µ0 x N² x p x R) / 2 for round coils

That give an inductance of ~178 µH and a resistance of ~3 Ohms for a diameter of 20cm (a ray of 0,1m in formula) and 30 turns. So if the inductance should be 350 or 400 µH the problem must come from the coil.

If i reverse the same formula for obtain the number of turns that give me an inductance of 350 µH and 400 µH it gives me respectively 42 turns and 45 turns. Unfortunatly i don't know how to mesure inductance, it's why i use calculation

Please tell what are you thinking about thoses results and it seems you correct. By my side, i continu to check all components.

Best regards

Manu

Re: Delta Pulse

Hello manu,
Your detection of a can of coke is very low , normally you will detect it at 70cm , 75 cm and with better circuit at 80-85cm.
Note : the can of coke in America is make of aluminium and in Europe in general in steel !!!!
You must check your coil inductance 350 to 400 uH with a low resistance Ex: 3 to 8 Ohms.
Do not desesperate check ,the circuit block to block ,you will find why and also learn more about it.
Have a nice day, Alexis.
and yes for me it is a good reference coke can because all around the world you can access it .

can anyone say

I found/see first mention on Delta Pulse in the forum, Eugenij did share the shematic. I wrote him, but his address is unaccessable/not existing.
maybe anyone have also schematic in a format of CAD software? I would be happy to this.

regards

Re: Delta Pulse

Do you really SEARCH for cans of Coke?
You should not use this as a reference for depth measurements. Use for instance various Euro and/or US coins, they will be much more acceptable as comparison marks.
However, 45 cm for such a can is QUITE short, specially in the air.

Willy

Hi everybody,

I have just finished to build the Delta Pulse metal detector and i would like to compare their performances with you. With a head of 20cm diameter and 30 loops of 0.5mm wire, i detect a can of coke at around 45cm. I think it's a litle bit short and it's why i ask you how deep you obtain.

Best regards

Manu