TESORO GOLDEN SABRE

[metaldetector107]

Max Qiaozh

Dear max qiaohz please help
Ivconic became so tired with and telling to buy a new MD where?????
i live in a bloody country Iraq we have nothing that is why i need your help.
My problem is
i have made Ivconic last TGSL but when tested i hear i countinuse sound
also when nulling coil i hear countinuse sound with some cracks
i have changed everythng no use when disconnecting the diode by LM393 the sound stops but very bad depth say 1-2cm for coin but when connecting its depth good but countinuse sound
all LM358 LM393 LF353 voltage are -v6.1 pin4 and 7.9 on pin8 so what is the problem please TX gives nice sinewave coil i test with Gift pack is ok
so please
TX freq is 14.4khz
please help
best regards

[ivconic]

Oh man oh man!!!
Ok...let's start all over again!
It's not that i dont want to help you, but i really dont understand you?

Now you are saying:

"...when disconnecting the diode by LM393 the sound stops but very bad depth say 1-2cm for coin but when connecting its depth good but countinuse sound..."

What "diode by LM393" ???

Here is schematic again. Please post here what diode, write diode designator or draw circle on that diode!
Is it D12?


P.S.
I noticed ; when you get angry, your English is radically improving!? Are you sure that you are from Iraq?

[ivconic]

One more thing; please can you post photos of your handmade?
Take a closer shot of pcb and please post here.
Regards!

[metaldetector107]

last tgdl

Hi ivco
yes it is D12 i have changed many times no use just when discconecting the sound stop when nulling but very poor detection
thanks

[ivconic]

Ok...now you are talking.
From now on please use designators and labels.
Have you ever suspected U106 or U107?
Why dont you put ic sockets and replace those ic's with another?
Also..how about posting photos?

[metaldetector107]

last

Dear Ivco
u107 106 are on socket yes i changed all ICs Diods transistors including FETs what else
i measure all caps with exact value all resistors the two couples of
10uf caps only i did not change 220u caps and 0.1 caps
the coil your value exactly 6mhTX 6.5RX freq 14.4..
about photo yes i tried but the reason is my upload very poor i cant send you i will try somewhere with speed internet.
yes hounsly i am from Iraq and i am Kurdish
i live in north and in Iraq its not allowed to have MD what tell u everything
is forbiden. how do i speak english actually i been in the UK for
3 years and i am IT specialist.

[metaldetector107]

TGSL photo

Dear Ivco
here is my TGSL last V

[Molzar]

metaldetector107

Just a quick observation, Where are the jumpers? (as this looks like a one sided PCB)

Also photo of other side (solder) may also be helpful...


Molzar

PS. So you from Iraq, but you are now in UK?

[simonbaker]

Hi ivco
yes it is D12 i have changed many times no use just when discconecting the sound stop when nulling but very poor detection
thanks

Can you measure voltages at each input of u106 (pins 2, 3, 5, 6)?

Also voltages at inputs of u107a (pins 5, 6)?

Also output of u107a (pin 7)?

Thanks,

-SB

[metaldetector107]

last TGSL

Last TGSL pcb bothsides with oscil

[Qiaozhi]

Last TGSL pcb bothsides with oscil

I don't mean this in a horrible way, but .... you do really need to practice your soldering. No wonder you have so many problems. For instance, have a look at the attached picture. Does this look like a non-connection to you?

Personally, I would suggest examining your PCB solder joints with an eye glass, and re-soldering the ones that look suspect.

[ivconic]

I agree. Sorry, but your pcb is horrible! I wanted to void any remarks on that, but is better to say - better for you. Also i do not want to offend you or hurt your feelings, but it is real wonder how it is working after all?
Jumpers must go on other side, soldered as they are now may short some traces (if not already).
Quiaozhi is right - you must recheck all soldering points again. Each one. Also you must recheck all the traces and eventuall breaks in those.
Behavior you explained leads me only to suspect diode(s) at 4024 outputs or mailfunctioning of chopper stage (negative voltage generation). But you already said those are ok and that you also measured proper negative voltage...so...i am confused, dont have idea what else should you check.
Most probably you have something unconnected or shorted there , on your pcb.
Do recheck everything. Use any method you can.

[Fred]

Actually those failed solders are for unusued pins,
but metaldetector107 put a light on the other side of the PCB and look from the copper side for shorts an micro cuts !
We can see you put a lot of efforts in making this detector,if you continue i´m sure you will suceed.

[erolunall]

Hello Metaldetector107

Open an AM radio . Connect a wire to 3 .th leg of 4026 .Which is path of a pair of 4.7k

Listen to radio during near the metal to coil.

I can hear on good sound by doing so.


I cant solve my problems but try radio it is working or not working.


Best Wishes
Erol

[simonbaker]

MetalDetector107:

It is very good you provided photos, thank you for the efforts.

My work is not pretty and I admire anyone who actually finishes a PCB.

I think the advice is good to check the solder joints. Some places look almost like "solder bridges", where solder touches the wrong copper trace.

You can check if you have mistakenly short-circuited two traces together by using an ohm meter to see if there is zero resistance between traces that should be separate.

Because you said your detector always gives tone, I asked for voltages on u106 LM393 chip. If the "+" inputs are both greater than the "-" inputs, it will give tone. The "-" inputs should be a very small positive voltage, very near to zero.

Regards,

-SB