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

[kt315]

When Whites introduced the slim line models the

Classic I, II, III, III PRO, III PLUS, ID, IDX, IDX PRO

They were built using the same motherboard just with features add or removed or change of coil size.


I, II used the older 6B coils. The rest use the BlueMax.


Not too sure if every version of the III used the BlueMax though?


The pre SL version used a different motherboard but the circuit is the same.

whites has esspecial digital identificator on every pcb. you have just to see it and then you will clear represent yourself what schematic is.
for just example this board 505-0188. try to see it. its easily.

https://www.ebay.com/itm/Whites-Surfmaster-Pulse-Metal-Detector-Headphones-Vintage-Not-Working/223105824833?hash=item33f224b841:g:fr8AAOSwyGhbdfSk

[chuubaba]

What are points highlighted in the picture? Anyone who has built this requested to share performance and use experience

[Koala]

I have question. Isn't the IDX circuit and the classic 3 essentially the same circuit?

When Whites introduced the slim line models the

Classic I, II, III, III PRO, III PLUS, ID, IDX, IDX PRO

They were built using the same motherboard just with features add or removed or change of coil size.


I, II used the older 6B coils. The rest use the BlueMax.


Not too sure if every version of the III used the BlueMax though?


The pre SL version used a different motherboard but the circuit is the same.

[kt315]

same. we say if see a new schematic 'simple like the classic' meaning that the schematic is simplest.

[dbanner]

I have question. Isn't the IDX circuit and the classic 3 essentially the same circuit?

[Koala]

Does anyone know if the red IDX pro board sold by silverdog is already fitted with this mod?

I have tried the 6B on the silverdogs board

You run out of adjustment on the ground balance. I added a resistor in series.

But if you jumper R46 and change VR1 to 50K and it looks like it will work with both types of coil.


The adjustment will be more course but you could gain the adjustments sensitivity back by using a multi turn POT if it will fit into your housing

[Tibuck19]

Does anyone know if the red IDX pro board sold by silverdog is already fitted with this mod?

[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.

[Koala]

And maybe change R43 if the disc is way out ?

[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

[kt315]

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

[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

[24kilo]

Try this

http://md4u.ru/files2/Whites_PCB/ID-IDX_SCH_FINAL_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

[Koala]

Try this

http://md4u.ru/files2/Whites_PCB/ID-IDX_SCH_FINAL_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]

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