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

[Ethanbarker]

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)?

[Ethanbarker]

is a 2.2 meg resistor the same as a 220k resistor.I am having a hard time finding a 2.2meg.

[Tial57]

Thanks for your reply.
I would take a photograph of the motherboard for enjoy your advice.

Best regards
Tial

[wiellie]

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

Best regards Theo

[Tial57]

This message is translated by Google.
Hello.
I'm new to the forum.
I'm in France. I have a classic 3 slx for many years (1999).


I want to realised (myself) Mr Bill's mods on my detector.
The Classic 3 SLX is made factory with the "ground balance".

I have to check and modified the following points:
1) 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.
2) 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.
3) S.A.T changes. R32 220k resistor can be changed out. Raising the value been installing a 375k running it through a toggle switch with the 220k.
4) Threshold: Remove VR4 trimmer off the board replacing it with a 100k linear taper, single turn potentiometer.

Yes but……
5) Ground balance: Remove VR1 Trimmer off the board. Replace with a 50k linear taper, single turn potentiometer.
Should I make this change knowing that my detector already has a "ground balance"? See photo
Risk of malfunction or inconsistency if I add this mode?



Thank you in advance for the help you bring me

[wiellie]

I was wondering what size of resistors to use 1watt or 1/2watt or 1/4watt or 1/8watt or will any work? Which is the correct size to use?

I think half watt is good enough.
Smaller is not a problem there are not at high currents.

Kind Regards Theo

[Ethanbarker]

I was wondering what size of resistors to use 1watt or 1/2watt or 1/4watt or 1/8watt or will any work? Which is the correct size to use?

[wiellie]

IMHO the "ground effect" here is simply the 1/f noise that becomes more pronounced with slower motion compensation. My experiments with motion compensation say also that you have much smoother transitions, better recovery speed, and more meaningful pinpointing with slower motion compensation. As most of the detectors still are the refurbished old designs, many of these have a potential to go slower than their ancestors, simply because some of the op amps used now have less pronounced 1/f noise, and will not end in chatters and tears if slowed down a bit.

I think that it may work how you explain it.

[wiellie]

Yes, I've read on dutch forum, and also at the link I sent you with the turbo switch. http://www.metaaldetectors.nl/testen/classic3.html last litle picture, (translate de text.)
Perhaps the longer calculations, consumes more power, like a laptop that long calculate the battery faster empty. (play a game or so)

[Qiaozhi]

With the adjustable S.A.T. control, one can set up the threshold re-set speed for the different hunting conditions encountered while detecting. With slower S.A.T. speeds, one can detect targets deeper than they can in the same instance with a fast S.A.T., because your giving the circuit more time to analyze the signal. The trade off is that the ground will also have an affect. Tougher ground generally requires a faster S.A.T.

Yes, I'm certain that's the correct answer.
Unfortunately it doesn't explain your previous statement:

I know if you use the boost mode, the batteries have only half life time, but more depth! therefore, the switch is also important. (You have a choice).

Are you sure this is true?
Simply reducing the SAT speed should have no effect on battery usage.

[Davor]

IMHO the "ground effect" here is simply the 1/f noise that becomes more pronounced with slower motion compensation. My experiments with motion compensation say also that you have much smoother transitions, better recovery speed, and more meaningful pinpointing with slower motion compensation. As most of the detectors still are the refurbished old designs, many of these have a potential to go slower than their ancestors, simply because some of the op amps used now have less pronounced 1/f noise, and will not end in chatters and tears if slowed down a bit.

[wiellie]

Hello Qiaozhi,

Look wat i have found on the internet, we have both rigt.
The SAT is the boost mode, slower sat is more dept!
We are learning day to day.

Best regards Theo from the Netherlands.

With the adjustable S.A.T. control, one can set up the threshold re-set speed for the different hunting conditions encountered while detecting. With slower S.A.T. speeds, one can detect targets deeper than they can in the same instance with a fast S.A.T., because your giving the circuit more time to analyze the signal. The trade off is that the ground will also have an affect. Tougher ground generally requires a faster S.A.T.

[Qiaozhi]

Here's a quote from Mr Bill ->
------------------------------------------------------------------------------------------------------------------
S.A.T changes. R32 220k resistor can be changed out. Raising the value slows the SAT. I have been installing a 375k running it through a toggle switch with the 220k. Giving a high & low setting of the SAT. One could use a potentiometer for variable results.
------------------------------------------------------------------------------------------------------------------
So it looks like my initial assessment was correct. The switch simply changes the SAT speed.

[wiellie]

Hello Qiaozhi.
Yes I am certain that it's a 2-position switch!
And yes I agree with you, it is a strange cobination of settings.
In the Neterlands they make only the ground balance and the turbo switch, and that costs 125 to 150 euros and that is a lot of money for this little modification.
See the link and then the last small picture! http://www.metaaldetectors.nl/testen/classic3.html
So I hope Mr. Bill look again at this trade and can tell us how we can make the boost mode switchable.
Because there is a boost that you can read in the last part of the instructions, since you have to make an adjustment for the IDX display dept meter.

Best regards Theo.

[Qiaozhi]

If you look at the photo of Mr. Coin Chaser in this trade, you will see a switch with NORM SAT BOOST, could this perhaps be due to the depth?

Are you certain that it's a 2-position switch?
Is that not 3-positions ... NORM, SAT and BOOST?
NORM could be the non-motion (manually adjusted threshold) setting.
SAT is the self-adjusting threshold.
BOOST is something else, such as increased TX power (which would explain the reduced battery life).

However, this does seem to be a strange combination of settings.