TESORO GOLDEN SABRE

[satdaveuk]

YEEEAAAHHHHH....
It's working, soldering defect

Well done

Regards

[Ropcsika]

YEEEAAAHHHHH....
It's working, soldering defect

[Ropcsika]

Hi
Before you jump in at the deepend the most common fault for the symptoms you have is wrong connections on your 2n2907s and your 2n2222a, check the pinouts because theres at least 3 diffrent type pinouts depending on what manufacture made them.
Far as your hef4024 leave it alone theres nothing wrong with it.

Your boards look ok but always worth doing continuty checks on the traces with your meter before populating.

All the best

Okay, I check everything

[satdaveuk]

Please help me! I build TGS. If you connect the tx coil it beeps continuously. What is the problem?

Hi
Before you jump in at the deepend the most common fault for the symptoms you have is wrong connections on your 2n2907s and your 2n2222a, check the pinouts because theres at least 3 diffrent type pinouts depending on what manufacture made them.
Far as your hef4024 leave it alone theres nothing wrong with it.

Your boards look ok but always worth doing continuty checks on the traces with your meter before populating.

All the best

[Ropcsika]

This is my TGSL pcb.


A képet a Képfeltöltés.hu tárolja. http://www.kepfeltoltes.hu


A képet a Képfeltöltés.hu tárolja. http://www.kepfeltoltes.hu

[Farside]

You are correct. That is why conductive containers aren't all that good at shielding mains EMF radiation.

Also correct in the high frequency. I can think of a Faraday cage made of wire mesh. This will clearly not be effective against electro-magnetic radiation in the visible spectrum.

[simonbaker]

Not if no charges exist to be affected by the magnetic field. What you are relating to in terms of a moving EM wave misses the point that the alternating magnetic field would not exist unless there were its counterpart the E field. Your alternating magnetic field alone in space is doing nothing if there is no conductor within the field. A conductor is only a conductor because it contains discrete charges, which if affected by the field produces an EMF due to the movement of charges within the conductor. If you stuck your hand in a 10 Tesla 60 HZ magnetic field you would notice nothing. Unless you were wearing metal. Insert a coil in that field and I would not advise holding the leads. Probably I am explaining this poorly but in effect your alternating magnetic field is not going to produce radio waves of any noticeable amount in free space. However a wire in the field would then contain alternating charges which could radiate transverse EM. A coin in the ground in that purely magnetic field will radiate a counter field back at you, as well it would be producing an actual EM wave yet the length of the conductor is so small in terms of wavelength (at say 15 KHZ) the strength of the EM would be very small. Likely too small to notice in your search coil above ground. However the counter magnetic field will move charges in your search coil producing voltages strong enough for your MD to be affected by it.

What I am trying to say is your MD may see the coin but I doubt a transistor radio would even if it covered the 15 KHZ band. Or something like that.

I should clarify; assuming the radio's ferrite loopstick is not in the search head. If it were then we have a BFO type detector?

It sounds like your description is relevant to electromagnetic radiation. I still believe that you will find an electric field vector wherever there is a changing magnetic field, regardless if it is near or far field. But I think everyone is trying to say that slowly changing magnetic fields are poorly blocked by conductive shields, which seems true from experience (not having any superconductive shields handy).

Perhaps it is also true that "near-field" changing magnetic fields are not theoretically blocked by conductive containers -- a math (Maxwell) question I'd like to pursue sometime in the next 1000 years. Suitably fast changing electric fields are also not blocked by conductive containers I believe.

-SB

[Dr Vel]

Doesn't Maxwell's equations say anytime you have a changing magnetic field you also must have an electric field associated with it?

Not if no charges exist to be affected by the magnetic field. What you are relating to in terms of a moving EM wave misses the point that the alternating magnetic field would not exist unless there were its counterpart the E field. Your alternating magnetic field alone in space is doing nothing if there is no conductor within the field. A conductor is only a conductor because it contains discrete charges, which if affected by the field produces an EMF due to the movement of charges within the conductor. If you stuck your hand in a 10 Tesla 60 HZ magnetic field you would notice nothing. Unless you were wearing metal. Insert a coil in that field and I would not advise holding the leads. Probably I am explaining this poorly but in effect your alternating magnetic field is not going to produce radio waves of any noticeable amount in free space. However a wire in the field would then contain alternating charges which could radiate transverse EM. A coin in the ground in that purely magnetic field will radiate a counter field back at you, as well it would be producing an actual EM wave yet the length of the conductor is so small in terms of wavelength (at say 15 KHZ) the strength of the EM would be very small. Likely too small to notice in your search coil above ground. However the counter magnetic field will move charges in your search coil producing voltages strong enough for your MD to be affected by it.

What I am trying to say is your MD may see the coin but I doubt a transistor radio would even if it covered the 15 KHZ band. Or something like that.

I should clarify; assuming the radio's ferrite loopstick is not in the search head. If it were then we have a BFO type detector?

[simonbaker]

spikes

Hi,
they are always there... amplitude can change but you cannot totally eliminate: it's a drawback of design.

Kind regards,
Max

Interesting video - spikes reminded me of TGSL V+, V- busses. Ferrite anyone? (not to be confused with vegemite...)


-SB

[Dennis the Mennis]

http://www.geotech1.com/forums/showpost.php?p=95456&postcount=1

for example TGSL 101 part1

DTM

[der_fisherman]

only the tx coils connected. I want to nulling the coil. coils without no sound. okay. I check everything.
How can i make and where connect the shield? Starts and end point

There are many ways to null, probably TGSL 101 parts 1 & 2 from Don B. is the best document on this website, find it and download it and read it. It will become your TGSL Bible.
Basically connect the Tx coil only and put a scope on the Rx coil and adjust the overlap for the minimum voltage. Some people use a meter instead on AC and they also get good results I am told.
regards
Andy

[Ropcsika]

only the tx coils connected. I want to nulling the coil. coils without no sound. okay. I check everything.
How can i make and where connect the shield? Starts and end point

[Ropcsika]

+8v i measured 7,95 volt
-6v i measuired 6,18 volt

U2 pin12 7,66 Khz
u2 pion1 15.32 Khz
pin 7 and 14 7.94 volt

ic is not cd4024 only hcf4024

coil frequency is too high. around 17Khz

Which is the q1 and q3, q4- 2n2222 and 2n2907?

[Farside]

You will get this if there is no -6V.
This is generated from pin 12 of U2 so check that there is 7.3kHz (roughly) signal there.

If there is then check that +8V is present at the Emitter of Q3 and also check Q3 and Q4 are in their correct places and aligned correctly.

If no 7.3kHz is present then check to see if there is 14.6kHz (roughly) on pin 1 of U2.

If yes then check pin 14 of U2 has 8V and pin 7 is grounded.

If no then check to see if there is 14.6kHz on R71. If no then the chances are your coil is short or open. Check the resistance of your coil. Otherwise check the alignment of Q1.

[der_fisherman]

Please help me! I build TGS. If you connect the tx coil it beeps continuously. What is the problem?

You must get used to supplying full information, what you have supplied is basically nothing as there are probably several hundred reasons for it not working correctly.....

But to make a start:-

You must take a magnifying glass and check that all solder connections are good, that there are no short circuits between adjacent tracks and components.

Next lift all chips and make sure no legs are bent, make sure that the chips are correctly orientated (change that chip if wrongly orientated as it may be now damaged).

Check against the data sheet for any transistors that may be either with different pinning than originally planned for, that happens between manufacturers.....

Make sure that the CD4024 is the actual CD version for higher voltages, some are only for 5 volts and will get hot and burn out!!

How did you shield your coils?

Did you connect the shields in the coil head?

Wrongly applied/connected shields can cause REAL problems. If you remove the connection to the receive coil only, does the noise stop?

Which version of the TGSL did you build?

regards

Andy