Whites Classic, II, III, ID, and IDX Modifications

[Davor]

#1 ON PAGE 1 OF THIS THREAD FOR MR BILL

If you are talking about VR1 and VR4, there is nothing wrong or potentially harmful for your device, so if anything works worse than before, there must be some error.

Did you twist the wires neatly so that they do not pick any EMI on their way? Did you by any chance connect potentiometers to the chassis instead of a signal ground? (because of the antenna-like behaviour, a chassis is not supposed to be used as a ground, and it should be connected to the ground at a single point only)

You could put some photos of your build, and keen eyes of this forum will do the rest.

[kt315]

THE MOD DOES'NT SEEM TO WORK RIGHT

good start point to begin a path in electronics of metal detectors is a book INSIDE THE METAL DERECTOR, by George and Carl.
http://www.geotech1.com/forums/conte...metal-detector

[BUZZARD.NEST]

#1 ON PAGE 1 OF THIS THREAD FOR MR BILL

[Davor]

Which mod in particular was that?

[BUZZARD.NEST]

ANYONE WHO MAY BE ABLE TO HELP ME : I HAVE DONE THE MR. BILL MOD TO MY CLASSIC III AND I'M HAVING SOME TROUBLE . THE MOD DOES'NT SEEM TO WORK RIGHT ONLY WAY I CAN GET A SIGNAL IS WITH THE GEB /DISC TOGGLE ON ANY IDEA WAY AND ALSO DEPTH IN AIR TEST IS ONLY ABOUT 6" WITH A PAIR OF PLIRES AN 2OR3" OR LESS WITH A COIN PLEASE HELP

[wiellie]

Yes you can always try it.
I think the boost modification for more depth is the best.

[Tial57]

Same here in France I can not find much information.
I think install the mods except ground balance.

[wiellie]

Yes I know, that's why I find it confusing!
It is therefore a slx?
I only know the sl version!
On Internet is almost nothing to find about this version.

[Tial57]

It looks like the same.
But I see that vr1 also on the motherboard.
And that is the ground balance!

Best regards Theo.

The Classic III SLX already has a ground balance . See the gray cables connected on the motherboard.

[wiellie]

It looks like the same.
But I see that vr1 also on the motherboard.
And that is the ground balance!

Best regards Theo.

[Tial57]

Your ground balance is fine.
The other modification you can do, but look good that the motherboard is the same.

Best regards Theo

Hello
Following my previous post, here is the picture of my motherboard. Is it the same as the Classic sl ? .... Can I do the following mods ? :

Remove VR4 trimmer off the board replacing it with a 100k linear taper, single turn potentiometer.
Replace resistor R24 with a 2.2 Meg. You could have either a 470k or a 1.5 Meg there depending on when the unit was manufactured.
Check resistor R7. If it’s not a 51 ohm resistor, replace it with one of that value. It’s most likely a 100 ohm from factory. Later manufactured units had 51 ohms.

Thanks
Tial

[golfnut]

Question on the Two tone board.


When using the 2 tone board does the user....


1) Have all metal position selected on the Disc pot ? - ( so you have full depth)


or is it the case that in all metal the Disc and Geb channel gating is so close together the signals coming through look the same and the 2 tone board would not split them up?

S

[Qiaozhi]

I guess what I am wondering is, is meg and k the same(is a 2.2 meg a 2.2k)?

Just to reiterate what wiellie and golfnut said, but in a different way:
2.2k = 2200 ohms
2.2meg = 2200000 ohms

I would suggest reading an introductory electronics book to understand how to combine resistors in series / parallel to get different values.

[golfnut]

Ita as wiellie says..

1 ohm
10 ohm
100 etc
1,000 = 1k ohm (k is a thousand multiplier)
10,000 = 10k
100,000 = 100k
1000,000 = 1000k = 1M (M is million multiplier)
10,000,000 = 10M

[wiellie]

I have been having trouble finding a 2.2 meg resistors and I was wondering if a 2.2 meg is the same as a 220k ? or I guess what I am wondering is, is meg and k the same(is a 2.2 meg a 2.2k)?

1000K = 1 Meg
You can also use 2X1Meg in series.
Or 1 meg and 1.2 meg in series
It is not so critical.

Best Regards Theo from the Netherlands!