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

[24kilo]

Good day, I'm looking for the mod that will convert the Classic II SL with a 6B coil to a Blue Max. I've search the site and it was mentioned, but the links were dead. I bought this recently to use as a loaner unit and to put Mr. Bill's mods on. I've read that there a phasing issue going to the Blue Max. I called Whites, and that was a waste of time. With the Blue MAX smaller coils I would be able to broaden this old dogs abilities in trashy areas and or use a lager coil for open plowed fields.

Best Regards
24kilo

[kt315]

I'm looking for the mod that will convert the Classic II SL with a 6B coil to a Blue Max.
---
i begin to do especial tester for a coil. it gives a resonance frequency of RX and TX part
and helps the tuning.
http://www.geotech1.com/forums/showt...ester-of-coils

[Koala]

I'm looking for the mod that will convert the Classic II SL with a 6B coil to a Blue Max.
---
i begin to do especial tester for a coil. it gives a resonance frequency of RX and TX part
and helps the tuning.
http://www.geotech1.com/forums/showt...ester-of-coils

Don't know

As the classic II and IDX use the same board it cant be much.

I have seen the Classic III HP schematics which has different internal jumpers put have no idea what coil the HP used?

[24kilo]

Don't know

As the classic II and IDX use the same board it cant be much.

I have seen the Classic III HP schematics which has different internal jumpers put have no idea what coil the HP used?

Ok, Does anyone have a CL II and a CL III schematic to compare, I've found a CL I but no CL III. I know they both have 6.59khz freq, It has to be something on the frontend of the recv circuit. Still no call back form Whites.

[Koala]

Later Classic I,II,III,ID and IDX were all built on the same PCB


Three versions are on these schematics

http://metaldetecting.eu/index.php/topic,1565.15.html

[24kilo]

Later Classic I,II,III,ID and IDX were all built on the same PCB


Three versions are on these schematics

http://metaldetecting.eu/index.php/topic,1565.15.html

Great, got it, Thank You Very Much!!!!!!!

[24kilo]

To save some time for others, here they are , CL I, CL II, CL III, CL IIIHP and Surfmaster II. Now to figure out how to make the Bluemax work on the CL II.

[24kilo]

Here the IDX Pro which takes the Blue max, as you can see there's slight differences in the GB circuit.

[Koala]

Try this


http://md4u.ru/files2/Whites_PCB/ID-...505-0210-D.gif

Lots of info on the 505-0210-D PCB over on the md4u.ru website where most of the classic development was started


I have a classic I and he PCB has the same part number


Did see someone did the mods to run a bluemax coil 10 years ago but all the pictures and links are now dead. Could try posting on the whites forum. After all I don't think they are still made ?

[24kilo]

Try this


http://md4u.ru/files2/Whites_PCB/ID-...505-0210-D.gif

Lots of info on the 505-0210-D PCB over on the md4u.ru website where most of the classic development was started


I have a classic I and he PCB has the same part number


Did see someone did the mods to run a bluemax coil 10 years ago but all the pictures and links are now dead. Could try posting on the whites forum. After all I don't think they are still made ?

Very similar to the one I posted on #203. I'm seeing a few differences, The old obsolete transistors Q1 and Q2 are replaced with newer models and the biasing has changed , but the main thing I noticed is the GB circuit did change. I don't think this will be a big issue to swap over to the newer coil now.

Yes I have posted on the Whites forum also. Thank you

[24kilo]

So apparently whites forum don't like people digger around and posting schematics, they closed the post.
http://forums.whiteselectronics.com/...o-bluemax-coil

[kt315]

thats not new. they closed my thread with multitone mod. they do not like the schematics and all stuff angry birds.

[Koala]

ground balance

IDX 2.2k to 27.2k

II 0 to 50k


I suspect if you put a bluemax on a Classic II it will just need the ground balance adjusted internal


I have tried the other way and round and Run out of adjustment. But it works fine if I add a 10K resistor

[Koala]

And maybe change R43 if the disc is way out ?

[24kilo]

And maybe change R43 if the disc is way out ?

I may just copy the IDX GB components to the CLII and upgrade Q1 and Q2. What couple dollars worth of parts and 2 hrs work. I'll just do it all when I do the Mr. Bill mods. Right now I'm working on a Tube amp so the bench is kind full.