idx concentric

[akasyto]

My DD27 is not working very vell so i make 25cm concentric, .

[golfnut]

what goes wrong with the DD ??

Do you know the machine is good ??

[akasyto]

discrimination was bad,i think machine is ok.Detecting 1 euro coin on 32cm in air with this concentric.

[mohandes]

My DD27 is not working very vell so i make 25cm concentric, .

hi
are you make like TGSL coil with Don pdf ?
is it work ?
i make CC coil for IDX but dose not work and really need help any one teach all better.
regards
Edit :
i make DD and can not discrimination but can detect in air 2.5cm coin near 30 cm . but again please any one teach me to make CC coil .
regards

[akasyto]

I make it like that:
30T TX 10T Fb 0.65mm wire 1uF+22nF capacitor
310T RX 0.19mm wire 33nF

[golfnut]

discrimination was bad,i think machine is ok.Detecting 1 euro coin on 32cm in air with this concentric.



Does the concentric discriminate and the DD not discriminate?

[akasyto]

DD not.

[mohandes]

discrimination was bad,i think machine is ok.Detecting 1 euro coin on 32cm in air with this concentric.



Does the concentric discriminate and the DD not discriminate?

dear golfnut please guide me too . i have this problem yet . and if you can help me to make another CC coil .
regards

[golfnut]

The initial phasing is off, your goal is to reject ferrite.

Adjust the physical overlap to tweak phasing of Tx drive wrt to Rx preamp out. Check with ferrite. When you can tune out ferrite with Geb, the Iron can also be rejected with the disc

Tweaking the Rx coil cap by a few nF can also tweak phasing of your coils are potted.

[akasyto]

This is the oscilogram of my 8" concentric coil.

[akasyto]

My schematic with all mods.

[golfnut]

put the scillogram up for the DD so we see whats different.. S

[akasyto]

Ok here is the DD27

[kt315]

I make it like that:
30T TX 10T Fb 0.65mm wire 1uF+22nF capacitor
310T RX 0.19mm wire 33nF

at left top corner of the pic I took a diagram from 5900 di pro schematic. it is NOT IMAGING real state of coil.

real coil schematic is ANOTHER, that I did draw in the center of the coil, center of the pic.

remember this moment.

[akasyto]

?