Full m/lab SD2000 schematics

[Geo]

I am Greek/Australian.
Ellivas eimai filapako

Sid

Bravo...

[g.s]

fOR YOUR SODO rejoice. I will mention RESULTS with enamel wire just test completed.

[sido]

Hi Sido.
How you know Greek??

Regards

I am Greek/Australian.
Ellivas eimai filapako

Sid

[Geo]

g.s...very hard to build a coil with R = 0.4ohm with any solid copper enamel wire.

Good quality Litz wire or next best Teflon multistrand wire will help to keep R > 1.0hm.

Try the wire you have....22-23 Turns at 30cm.
Use on detector and see how it operates...Follow my picture above.

If all else fails. Get real Minelab Coil, Coiltek Coil, Nugget Finder Coil. So many out there.

Sid Kali epetuxia

Hi Sido.
How you know Greek??

Regards

[sido]

Hello, I suggest insulated wire, as in the photo, I am developing the project in a DIP format, and in this example has 298 uH and 0.4 ohm.

[ATTACH]23752[/ATTACH]

Hi Baterista, where did you get that wire from?

Sid

[sido]

Can I buy 0.4 the 0.3 enamel wire , can I can use this caliber.

g.s...very hard to build a coil with R = 0.4ohm with any solid copper enamel wire.

Good quality Litz wire or next best Teflon multistrand wire will help to keep R > 1.0hm.

Try the wire you have....22-23 Turns at 30cm.
Use on detector and see how it operates...Follow my picture above.

If all else fails. Get real Minelab Coil, Coiltek Coil, Nugget Finder Coil. So many out there.

Sid Kali epetuxia

[Baterista]

Hello, I suggest insulated wire, as in the photo, I am developing the project in a DIP format, and in this example has 298 uH and 0.4 ohm.

[g.s]

Can I buy 0.4 the 0.3 enamel wire , I can use this caliber.

[sido]

If he use enamel wire then the self-capacitance will be high and the coil to have not the ability to work fine at low delay (near to 10us)

Regards

Geo...yes that's what G.S has and he might as well try it....Like i said he needs to keep coil wire capacitance low and most important R = Resistance as low as (0.4 ohm). Enamel wire 0.5mm will not be suitable as R will be over 1.0 ohm.

Sid

[Geo]

You mean build coil 30cm with 0.5mm copper enamel wire?

For 30cm coil + 0.5mm wire = 22-23 calculated turns = Inductance 300uH = Resistance 1.0 -1.8 ohms (R could be higher depending on copper wire).

Sid

If he use enamel wire then the self-capacitance will be high and the coil to have not the ability to work fine at low delay (near to 10us)

Regards

[UrbanFox]

Damping resistor placement is wrong. Think about it.

Woody is correct, the position of the damping resistor in post number #276 is wrong. It should be connected across the coil, not across the coil and blocking diode.

The resister network should be to the anode of D13. Where it is now it bleeds voltage off the fet, or, it defeats the purpose of D13, the capacitance blocking diode..

[sido]

thank you to everyone for your help. I have copper enamel 0.5 cm such as the picture (1) I want to build coil 30 mm .how can I calculate the TURNS


[ATTACH]23741[/ATTACH]:

You mean build coil 30cm with 0.5mm copper enamel wire?

For 30cm coil + 0.5mm wire = 22-23 calculated turns = Inductance 300uH = Resistance 1.0 -1.8 ohms (R could be higher depending on copper wire).

Sid

[g.s]

thank you to everyone for your help. I have copper enamel 0.5 cm such as the picture (1) I want to build coil 30 mm .how can I calculate the TURNS

:

[Geo]

5 cm? try 5mm That is no way to make an efficient coil.

I have not something to try!!!.
I read this thread for encyclopedias

[Geo]

Siynomi Geo
Sorry Geo

5mm

Sid

Sorry for what???

Again thanks!!!