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A photo from the the screening tape.
Regards.
Ap
Regards.
Ap
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Looks like good stuff, I was looking for something like that, thanks. Thanks also for relating your coil experience.Originally posted by ApBerg View Post
Cheers,
-SBComment
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Screening tape
Hello Simon.
Do not know what country your from, but Ebay Germany has it now for sale.
From Scotch it is expensive. The Ebay price is cheap..
Regards.
ApComment
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Hi
Hi,
To all!
)))
Here at last for short.
So,
Molzar thanks again for the pic.s.Sory I dont wanna rush you,but I still cant see some vital spots for me.And also when you have time please take a pic. of this coil buxe wirings inside control box.
TGS here/Kurtie100/ and TGSL have 2 cables for TX that goes into PCB.And on this pictures we see 3 cables soldered for TX????
The wiring is vital.I can see total change in behaviour when change wirings!
Max,
we are all glad that you are here.
Ivconic,
I have watched your counryman video detektor metala mostar.
But cant see is this DD27?Some measurments are needed!Like many other good tests in youTube..!!!You now.Yours are.
And in the original TGS video.............Hum,Ivconic this is not depth test.Just intro for device!!!Molzar,says 22cm for 25cUS LOUD!
Now finaly I get my working TGS and will compare,but on my not yet tuned TGS I detect 25cUS from 25cm but craked!Same with all ithems and coins.Loud to 22cm!And then noticable decreace.
Can you post good video for TGSL 1265 and measurments when you have time.I now that you are on EPE now.
SEE youComment
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Anyone tryed this with TGS?
It will be interesting?Comment
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TESORO 18'' X 3.6 '' -5 PIN - COIL - METAL DETECTORComment
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Also,
Can we put some quartz 14,6 kHz there insteed of those caps?
Where are everybody!
NEVER been so silent here..........................................?Comment
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TGSL 1265
Dear Friends,
I built TGSL 1265 but it is not work. 22 ohm burned. no sound. no response . no voltage and frequency at TX/RX coils. I used 8 ohm speaker instead. What is it problem?
of 16 ohm speaker.
my coil measurements:
TX: 6mH
RX: 6.5mH OO coilsComment
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TGSL 1265
Pardon...
I used 8 ohm speaker instead of 16 ohm speaker...Comment
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fjdjsfjsfjfgjabhqb
where are you from?
Register firstComment
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If you have no V+ voltage, LM7808 may have been destroyed by now and is open, or you have a short circuit from V+ to ground. If just oscillator not working, that is more complicated.Originally posted by Unregistered View Post
The Darlington transistor may be destroyed also check that.
Before turning back on, put a 50 ohm resistor in series with battery to protect the LM7808 regulator in case you have a short circuit somewhere after its output.
It is possible an error in your circuit (backwards diodes, shorted trace, etc.) caused the darlington to stay on all the time, which burned the 22 ohm resistor and maybe the darlington also.
You'll need to proceed carefully by testing voltages. Make sure you can disconnect your battery quickly if necessary. First test the output of the LM7808 -- if it is much lower than 8 volts, you must be drawing too much current, maybe a short circuit. A current meter in series with the battery is helpful too, it should not be over 50 mA.
Does you circuit have the 555 chip in it?
Regards,
-SBComment
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Yes,I added 555 in it.
Thank you simonbaker...Comment
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Hi,Originally posted by Ultimate_Haze View Post
why not ? You must change oscillator design and use quartz... then match the required output voltage at tx coil.
The result will be probably less chatters in mineralized soil: using colpitts your oscillator has frequency that depends by coil inductance and 2 caps there... when inductance vary (e.g. near a target or above mineralized soil) your tx frequency vary and that variations could trigger some jitter and so make chatters appears.
That's cause moving the coil over mineralized soil is like having sweeps in coil inductance at every sweep of coil.
With fixed frequency that issue is solved and you're virtually free of unshielding tx coil also (but there are static charges considerations to make also). That's the way some fisher do , as I remember, crystal controlled osc and not colpitts or other "tuned" lc oscillators kind.
I think it could be good... but since the source of chatters and falses are much more that just tx frequency shifts it will be not the definitive solution to that: much of quality and stability of MD depends on whole design than just tx oscillator frequency stability.
Kind regards,
MaxComment
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