When I touch the connector make sound . please help

[amanj]

my tgsl depth is good, but when I have searched a bit unstable with severe shake when searching make sound. All metals are unstable mode with touch connector make sound .what could be the problem please help me

[dfbowers]

Usually, that indicates a grounding problem with your coil or cable shield. How do you have your cacle shield connected?

[amanj]

Usually, that indicates a grounding problem with your coil or cable shield. How do you have your cacle shield connected?

Thanks for the answer. Finished coil connections tgsl-101 The file has been properly done. Photographs coil type of circuit, cable and type of battery have placed on the bottom. Whether the problem is the cable type? Thanks

[dfbowers]

USB 2 cable works just fine.. has to be an issue with grounding or mechanical stability. The only other issue I have ever encountered is when using external pots. The gb pot must be grounded.

[dfbowers]

Just another thought. If your phasing is off you could end up with stability problems as well. To rule out that issue:
*can you ground balance correctly and still detect silver?
*can you reject aluminum foil and nails in disc mode?

Don.

[amanj]

Just another thought. If your phasing is off you could end up with stability problems as well. To rule out that issue:
*can you ground balance correctly and still detect silver?
*can you reject aluminum foil and nails in disc mode?

Don.

hi dfbowers
yes and yes .I can detect a copper coin and i can reject aluminum foil and nails in disc mode.
But when I shake the coil and box make sound.

Whether the problem is the coil., I do not have henry metre,But resistance of tx and rx is 28,27 . Whether to build a new coil?

[dfbowers]

Do not build a new coil just yet. What is your tx frequency?

[satdaveuk]

This is very important: With your coil connected outside in the middle of know where, Touch the casings of the two TX oscillator transistors and see if it gives you instability/falseing, if so
Providing your coils ok and you have good grounding from your front end socket to deck and all external pots are grounded to negative supply,(if you used metal type) it may well be, infact im pretty sure that you have made yourself a up to spec TGSL project thats working overtime.
Just change the two oscillator transistors for plastic type and problem will be solved.
Note:If possible double check the pin outs with manufacture/ supplier of the plastic types before installation as there is at least 4 different configurations available.
Seems like a blue print to the same problem I expernced on my second build which was built very accurately to Ivonics TGSL project which works works a dream .
Also while your at it smarten up on some of those wire connections you have made off, theres some there that would make a good aerial which is the last thing you want with a metal detector unless your looking for alliens, At the very least its not looking nice, so tidy it up.

Regards

[amanj]

Do not build a new coil just yet. What is your tx frequency?

hi dfbowers
my tx frequency is 13.20

[amanj]

This is very important: With your coil connected outside in the middle of know where, Touch the casings of the two TX oscillator transistors and see if it gives you instability/falseing, if so
Providing your coils ok and you have good grounding from your front end socket to deck and all external pots are grounded to negative supply,(if you used metal type) it may well be, infact im pretty sure that you have made yourself a up to spec TGSL project thats working overtime.
Just change the two oscillator transistors for plastic type and problem will be solved.
Note:If possible double check the pin outs with manufacture/ supplier of the plastic types before installation as there is at least 4 different configurations available.
Seems like a blue print to the same problem I expernced on my second build which was built very accurately to Ivonics TGSL project which works works a dream .
Also while your at it smarten up on some of those wire connections you have made off, theres some there that would make a good aerial which is the last thing you want with a metal detector unless your looking for alliens, At the very least its not looking nice, so tidy it up.

Regards

hi satdaveuk
Many thanks for your help.I'm touched the casings of the two TX oscillator transistors gives me instability.I'll change as soon as the metallic transistors whit plastic type and tidy the wiring.
Sorry From my bad English

[golfnut]

The cable to the coil has to be fixed to the pole - as the cable itself can be detected - any movement here will sound.


Does your coils have shields?

If So, does the shields connect to the braid of the cable inside the coil assembly?

This braid/drain/sheild often go to pin 3 of 5 on connector. So Rx Tx are either side of ground.


You dont have a braid connection on your 5 way connector or on the cables in the image,
Your case appears to be plastic and non conductive
Your connector body is not gounded to anything.

Ideally the case would be metal or metal lined, the connector would be connected to the case, and grounded to pcb ground at this point.

The cable braid would go the the unit main ground.




S