King Cobra PCB

[kt315]

I can tell about Hot Head I bought a detector with, it is 30,5 cm outer housing diameter, 28 cm is TX winding diameter. I have not original GMT coil. no data on original.
TX coil resistance is 25,2 Ohm, RX is 69,6 Ohm.

[herpes]

hello, how is the total resistance of the two coils in each case? and how thick is the wire?
greetings

[kt315]

4th unused wire now connected. resistor in RX winding is 47 Ohm.

[herpes]

arrg, no wonder it does not work properly with me I have 6.5 rx - tx 6

[calebsone]

sorry it took so long ok the detector works not like it should tho. the only thing i did that i dont see anyone else did is i found a 12v battery pack with a charger built in on ebay could it be causing all the noise i see on the oscope. im trying to get oscope pics up have to wait for my wife to give me the good camera

[kt315]

TX

[kt315]

RX

[kt315]

can you measure resistances and inductivity of the coil? can you give pics of signals on TX winding and on preamp output? a trouble nobody did open old tesoro coils, no info besides some data Carl posted.

[calebsone]

ok i have an issue do you think the older tesoro coils have a different wire schem then the one previously posted i have 4 wires 3 used red green white and drain the red and drain i put on tx green white rx all im getting is constant tone in all met mode. all voltage is correct o-scope looks right im sure the coil is the problem. i tried reversing all connections but still nothing

[herpes]

hello, how are the data for the coil?, and there is indeed a resistor in it.

[kt315]

just now got nice 3pcs housing I bought from ukrainian seller.

[kt315]

try move far the coil from o-scope and PC - hang up on window like me I did. try to exchange TX wires connection in the coil. I did such way and now it works more stabile.
on photo Hot Head coil I opened - strange connection I did see and I remade this in more logical way, there one wire in cable was not used.

[herpes]

the capacitor is not the problem, but a bridge removed, the smaller of amplitude is normal now,
there have now intervals, in the All Metal mode, it almost sounds like my barracuda pi in disc mode much noise stops when the metal comes in range, then it works normal.

[herpes]

Hi, just back from vacation, I just took my board in hand and just see c 1 has only 40 pf, correct time tomorrow, maybe this is the error.

[kt315]

a signal on TX winding directly o-scoped. 20 usec/div and 2 V/div scale.