IGSL

[liekwang]

after I turn the pole position and 0 volts at 7808 ic pin 2 ground and I wear bipolar capacitor according scema not sensitive coil can reach 30cm to test coin

[medj]

Thank you
But I see it's the same scheme, which created
Where some increases to see scheme

http://im41.gulfup.com/pKTvQ.jpg



skayep ** medjmedj45

[Davor]

davor is this true positive and negative pole position

Yes, 1000uF capacitor is reversed, that's the only mistake on Petravka board.

[Davor]

Medj, please make a photo of your board. I can't see any detail in your video.

[Davor]

Medj, your loudspeaker seem to be a piezo buzzer. Does it buzz when you connect it to a battery, or it just clicks? Either way you can't get any meaningful output with a self-oscillating buzzer (that buzzes by itself), and you'll need to put a 33ohm resistor in parallel with a non-buzzing transducer, because in a circuit a piezo crystal acts as a capacitor, and you need some current to enable BD140 to work. Otherwise it is constantly saturated and nothing happens.

[liekwang]

?Davor why every x I touch there is sound speaker coil cabel false signals how to setting GB

[liekwang]

?Hi how to eliminate carany davor tone from stone test because the stone is also sensitive to

[Davor]

You need to learn how to tune ground balance. I guess you are Indonesian living on some volcanic island with highly mineralised soil.
Maybe your best option will be joining GB together as in my mods, and put a potentiometer on the front plate.
1. you must find a position on your GB potentiometer that does not produce sound but maybe only clicking when you wave a piece of ferrite in front of your coil. Mark that position as "ferrite".
2. by waving a coil up-down, not left-right, find a position on a GB potentiometer that silences your device. Mark that position for future reference.

Now your device does not sense most of the rocks.

[liekwang]

? I have not been able to eliminate the signal from a test to a rock and do not understand what the settings should be for potentiometer coil musketer I wear protective AL foil ..??

[liekwang]

?Yes in my country its very soil contains mineralised and volcanic rock and isgl I am very sensitive to soil and rocks and how to disappear right out of the ground signal thanks davor for your answer

[medj]

I do not understand why you want to Eric any type of image
I'm the device does not work
I use bd650 * bdx54c * bc637
In place bd140
With some of the changes shown in the picture
Power connector to all the points
Scheme, which she created is this
http://im41.gulfup.com/pKTvQ.jpg

[Davor]

?Yes in my country its very soil contains mineralised and volcanic rock and isgl I am very sensitive to soil and rocks and how to disappear right out of the ground signal thanks davor for your answer

It is ground balance, or GB for short. Al foil has nothing to do with eliminating ground. You have a pair of trim pots on your board for that purpose. Ivconic wanted to use those separately so that Fe channel indicates a bit of ground, and once tuned properly - just let them be. It would work fine in European inland boring soils. But in your case it will not be possible. You'll have to use a front panel potentiometer for GB instead. I think the best way to do GB on IGSL is to join GB for both Fe and Non-Fe channels. Minimum changes on your board will be necessary if you apply my mod, as follows:

[Davor]

I use bd650 * bdx54c * bc637
In place bd140

BC637 is a NPN transistor, and BD650 is a darlington. Both are wrong choices to replace BD140.
Please put a photo on. There are many people with keen eye for electronic detail on this forum

[liekwang]

?Davor I have not understood your suggestion to position potentiometer to connect where and you made me understand only pin 1 and 13 are connected please give me ways I can understand with scema you provide

[Davor]

It is not complicated. You need to use a single comparator to drive both GB channels of Fe and Non-Fe with same signal. To do that you need to set comparator U4d high, and easiest way to do that is by removing the trimmer and connecting the "-" input to negative voltage. Next you simply need to connect pins 1 and 13 so that U4b does all the GB work. This results in common GB drive in both Fe and Non-Fe channels. To have a real potentiometer at hand to adjust GB on the go, you need to replace a trimmer potentiometer on the PCB with a real potentiometer on the front panel, so you simply extract a trimmer Tr1 and place two wires in it's place, and connect a potentiometer. Beware - the high impedance of this line is prone to picking up various EMI, so twist the wires that go to the potentiometer. Now you have common GB control on your front panel.