Full m/lab SD2000 schematics

[eclipse]

Great work. Must have been a long process of designing boards for this thing. ML approve those boards.

[ashkelon]

hello friends, i designed ML ground balance and channel 1 circuit. i use this circuit part (ML) with surf pi or other pi detector. but not eliminate hot rock and brick. different timing little cancel brick signal but sensitivity very lower. Can you please explain how is the working ML GB sistem and how is the eliminate hot rock ? i don't use VN2410L and ZVP4105 fets.

[ashkelon]

channel 1 is working very sensitive. if you do ground balance by eliminating hot rocks. sensitive very low for low conductive metals. high conductive metals better

[serci78]

Hi.What is auido board cap type..

[kadir6141]

hi friend. how to set lt1057. n10 240us n9 152us is it correct time? and n12-n13-n11-n14 What they to be need time
There are also a lot of noise in the output ne5534. Between 8 and 5 pin to suppress it 8.2pf capacitor Did we put into effect

Can you help about this situation

<a href='https://postimg.org/image/g1hj21xvb/' target='_blank'><img src='https://s23.postimg.org/g1hj21xvb/how+to+set+lt1057.png' border='0' alt='postimage'/></a>

[ashkelon]

dear friends,
can you please check the U21-D (TL074) pin14 out is zero or near zero ?

[kadir6141]

Thanks ashkelon

[Mechanic]

dear friends,
can you please check the U21-D (TL074) pin14 out is zero or near zero ?

Yes, without a target present, both pin 7 and 14 should be near 0v. Put a target on the coil, this voltage should change.

Cheers Mick

[kadir6141]

hi mechanic. when it is not metal tl074 pin 7 0,40v and pin 14 0,20v I am How do this voltage should change.
I must use what type of bypass capacitors. I use tlc074 instead tl074cn. is this a problem. the time turns down does not change trimpots . however, it changes the timing of changing the crystal. Do you have any idea about it

[ashkelon]

hi mechanic. when it is not metal tl074 pin 7 0,40v and pin 14 0,20v I am How do this voltage should change.
I must use what type of bypass capacitors. I use tlc074 instead tl074cn. is this a problem. the time turns down does not change trimpots . however, it changes the timing of changing the crystal. Do you have any idea about it

when you bring closer a metal .... coil, this voltage will change

[ashkelon]

Yes, without a target present, both pin 7 and 14 should be near 0v. Put a target on the coil, this voltage should change.

Cheers Mick

thanks for replay Mechanic

C32 capacitor 2.2 microfarad ? i did not finish yet U22A - U23A opamp circuit. i think so this is high gain opamp U22A and output voltage will change more than before opamp U21D (U21D opamp out very few voltage change when bring closer metal to coil). but i did not understand how it will work. current will go over the capacitor ?

[ashkelon]

hi mechanic. when it is not metal tl074 pin 7 0,40v and pin 14 0,20v I am How do this voltage should change.
I must use what type of bypass capacitors. I use tlc074 instead tl074cn. is this a problem. the time turns down does not change trimpots . however, it changes the timing of changing the crystal. Do you have any idea about it

Kadir6141, if there is no metal over coil but opamps out high voltage you must check the all pulse width are correct ? (n9-n10-n11..., if you can change pulse width, you can adjust opamp out voltage closer zero

[kadir6141]

hi friend. ashkelon n9-148us 10v n10-236us 10v n11-64us 10v n12-44us n14-15us n10-240us n50-226us n14-15us n13-15usn70-944us
I am how to make can adjust opamp out voltage closer zero. Hold the metal coil tl074 pin 14 2-3v rising

[Mechanic]

hi mechanic. when it is not metal tl074 pin 7 0,40v and pin 14 0,20v I am How do this voltage should change.
I must use what type of bypass capacitors. I use tlc074 instead tl074cn. is this a problem. the time turns down does not change trimpots . however, it changes the timing of changing the crystal. Do you have any idea about it

0.2 and 0.4v is about correct when no metal or ground is near the coil. Small changes on this stage are amplified by the next stage with the 2.2uf cap.
You won't get these voltages much closer to 0v. This voltage is caused by imperfect coil and charge injection from the 4066 analog switches.
The trimmers are to cancel the magnetic earth field, they won't adjust the low-pass filter offset.

Cheers Mick

[kadir6141]

thanks The large master mechanic