Sovereign Problem

[Geo]

Hi.
Finally my friend gave back my Sovereign XS. But with problem.
When i turn on it detect with medium depth for 10... 15 sec and after it it lose the audio and the depth. I must touch a coin on the coil to beep.
I opened it and measured the power supply. I read the +-5V as 9.7v (the leads between the +-5V) but when begin to lose the audio it run until 10.8V. I have a schematic of Power supply but i need a schematic for all the detector if problem is not only the P.Supply.
So please Help.
If somebody has a Sovereign Schematic, i need it.
Regards

[Esteban]

Simple solution: Wait your White's!

[Geo]

Simple solution: Wait your White's!

Haha...
Hi Esteban.
I prefered the TDI that it is PI.
Sovereign is VLF. Also i have a XLT and a GTI2500 but Sovereign is Killer....

Regards

[WM6]

Finally my friend gave back my Sovereign XS. But with problem.

Never lend your detector, your wife or your car to friends, or problems occurred.

[Geo]

Never lend your detector, your wife or your car to friends, or problems occurred.

Right.....

[Geo]

Still problem with power supply. It use a TL062, a BS170 and a KA336-25. I replace the TL062 but nothing. I did not found BS170 so i connected a BSS108. Problem exists. Ka or LM336... i did not found them , so i replaced it with a 2.5V zener. Nothing .
Now... after Monday i will see........

Regards

[nakky]

Still problem with power supply. It use a TL062, a BS170 and a KA336-25. I replace the TL062 but nothing. I did not found BS170 so i connected a BSS108. Problem exists. Ka or LM336... i did not found them , so i replaced it with a 2.5V zener. Nothing .
Now... after Monday i will see........

Regards

Geo you can use,

BS 170 = ST 70A if jou can find

LM 336 = LM 385 Z 2.5 are the numbers in my SOV XS

[nakky]

Geo,I think the only problem is the BS 170 start with this.

Grt Nakky.

[nakky]

Geo,is it this part of the pcb ?

[Geo]

Hi Nakky.
Thank you for your help.
The pcb is not the same. Today i will give it again a try. Also i must replace the two capacitors 1000uF/16. If one of the two is not good then it moves the gnd point. Finally i will make a simple external power supply . Anyway, i will go for 2 days at a mountain for treasure hunting with a big team, and when i come back i will continue....

Regards

[Geo]

Hi.
I attach the schematic of the power supply from XS. My XS have some small differences, and i will notice them later.

[Geo]

Hi. Finally i repaired my XS. I replaced TL062, LM385 and BS170. Voltage was 10V but the ground was not good, it was 0,+7v,-3V. Finally i found a burned smd transistor, i replaced it and now is OK. But how this transistor work??? it is connected the collector to -5v, the emitter to gnd and the base to the output of a quad op.ampl (TLC27L4). This tsansistor was short (small resistance) so it moved the gnd point. But who is the purpose of this transistor??? to protect from what??? i really don't understand.
But now i have another problem
VW6 had right when told that "Never lend your detector, your wife or your car to friends"
Detector when "working" ok has not good depth, about the half .
When i open it with the coil connected, it work about 20 sec and stop, no sound with full threshold. If i will put a metalic object on the coil it work again for 5 sec and the same again.If i will remove the coil i hear the audio all the time no problem. I connect the coil and i connect the oscilloscope to the output.... it works always, i connect only the gnd of the oscilloscope probe to the gnd of detector, again always it work.
But it don't work alone, and when work no depth....
I forgot to say that when it stop to work the voltage is going from +5V to +5.8V and the -5V remain -5v.
I believe that the problem is the coil (maybe the inner coil amplifier). I connected the coil to the audio generator and i gave square pulses 12Khz, 20V p-p. At the Rx out i took a signal of about 10V..... Yes 10V.
So i believe that there is a problem inside the coil.
Who is your opinion....

Regards

[Geo]

I wanted a way to be sure if the problem is the coil or not. So i found a handmade coil from TGS. The shielding was not connected but i leave it as it was. The null was not good but again no problem.... The Tx and Rx inductances was far...far from the original inductances..... again No Problem . The original coil has inside a preamplifier with 30x gain, and the hand made ... nothing, no problem, I connected it to the Sovereign and i turned it On. Sovereign ... is working, don't stop after 20 sec as the previous original coil. I took some coins and i checked it. It detected the coins at a distance of 20...25 cm max, and a soda can at 40...45 cm .
I believe that the detecting distance is fantastic for a so bad coil without amplifier inside it.
Now i will winding a 15'' coil and if it is not good i will order a WOT 15''
Winter is coming so i need something to spend my time

Regards