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Offline GoldDigger1950
The Old Man and the Soil
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« Reply #280 on: October 14, 2012, 10:35:13 am »
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Quote:Posted by xavier
DD coils are amongst the easiest coils to make, but you need to respect the inductance of both coils the nulling of the coil correctly and inductance are vital.

Don't forget the field polarization and the interaction between both fields.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!

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« Reply #281 on: October 15, 2012, 08:54:45 am »
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hello firebox
here some photos of my detector.
regards

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« Reply #282 on: October 15, 2012, 09:45:08 am »
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Hi Supergold,

great chassis! very fine!  Great  I see you have a headphone connection. Do you have Mono or Stereo Signal?

The coil is the russian basket coil. It is beautiful, but hard to build.

Today i have shielded my other coil with aluminium foil. It works great. The Guard Intervall is still 24-25 and Barrier is 1 !!

Now i have to fill epoxy in the rest of the coil housing ....

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Offline supergold
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« Reply #283 on: October 15, 2012, 10:41:40 am »
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hello firebox
you have shielded with what??? have you notice deeper detection? i have shielded mine but with worst results then before shielding.


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« Reply #284 on: October 15, 2012, 10:57:57 am »
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silverpaper, aluminim foil ... or what is the english word for it ?

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shielding gives a little more of sensitivity and the interference signals are better. You must link the shield to ground on PCB.... so my chance runs quieter ...

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« Reply #285 on: October 15, 2012, 03:11:09 pm »
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hello firebox
i tried to shield mine but with worst results than before of shield , so i have take it off now i get 35cm 1 euro coin in my kitchen  Cheesy Smiley

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« Reply #286 on: October 15, 2012, 03:21:29 pm »
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Quote:Posted by supergold
so i have take it off now i get 35cm 1 euro coin in my kitchen


really? that is incredible!  Cheesy  Shocked i get only 25 cm 1 euro coin  Angry  
it must be your russian basket coil  Great so i will try to make other coils for it. Hopefully it works like yours  Wink



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« Last Edit: October 15, 2012, 03:24:07 pm by Firebox »
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« Reply #287 on: October 15, 2012, 03:44:13 pm »
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only in my kitchen i get that deep, in the rest of the house is worst , i never had try it outside , it detects gold fine too, a gold ring 35 cm. if the battery voltage is higher than 13.4 volts the  sensitivity is worst about 20 cm, i have tried the coil with another chance and it give the same results. 

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« Reply #288 on: October 15, 2012, 04:02:20 pm »
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you must try the chance outside, because in the house you have a lot of interference signals  Wise  outside it should be better  Waveing

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Offline MaterSva
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« Reply #289 on: October 29, 2012, 11:20:06 am »
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Hello everyone!

This is my version of Chance PCB board. Characteristics:

- No SMD components
- 2 layers board
- small dimensions: 60x120mm

Also, there is some minor differences in schematics:

KP505 replaced with BS170
OP37 replaced with 2N3334
HER208 replaced with UF5408
2SC945 replaced with BC337
A733 replaced with BC327

I will provide pcb prints here soon as possible.



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« Last Edit: October 29, 2012, 11:23:26 am by MaterSva »
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