Inside the TX-2002 pinpointer

[kt315]

thank lots Martin for your home work. as I promised, you can get all archive of this forum on DVD for free. give me your snail mail address (in PM) and I will send you the disc.

[greylourie]

Is there a Gimp for Windows ?

For anyone interested, here is the link for Windows versions http://www.gimp.org/downloads/

[greylourie]

Is there a Gimp for Windows ?

[mr.sneezy]

you can use GIMP to flip the rear view, place it on a second layer, and allow it to show through by changing the opacity of the top layer.

Can you post up a saved GIMP image of this technique when you do it, be nice to see what a pro can do with GIMP.
Martin

[mr.sneezy]

Oh yes, I nearly forgot. I took additional populated board shots in case the ones I posted on day one were not good enough. Plus there is a shot of my last testing ferrite coil winding (that worked best).

Martin

[mr.sneezy]

Bare board images.

Here are three sets of images. The first pair is done as you wanted (outdoors under open sky), the second pair is under studio lighting (controlled lighting with minimal glare) and the last pair is back lit. Use whichever your suits you.

I think that now covers the four steps below the project needs from me.

"1. board with components pics in hi resolution at sunny day at open air.
2. desoldered board. pics in hi resolution, of both sides, at sunny day.
3. full part list. every components must be measured individually, not via color code only looking.
4. all transistors must be researched by haracteriograph, or tested on matter they are PNP or NPN structure of."

Let me know if not, as I'll put the board back together otherwise.
I'm very curious to see the schematic and see what the heck is supposed to be going on...

Cheers,
Martin

PS. The tracks from D9 back to itself via pin1 of both IC's are interesting
(unless I'm wrong).

[Qiaozhi]

Backlighting really shows up thin tracks well.

There is no need to backlight the board. As long as you have a clear image of both sides, you can use GIMP to flip the rear view, place it on a second layer, and allow it to show through by changing the opacity of the top layer.

What is the largest file size JPG image I can attach here ?

png, tif and jpg have a size limit of 1MB.

[mr.sneezy]

Final Parts List

PCB maybe that?
Mistakes can happen. only suggestion

Wow, impressive given the short amount of time. Yes, you have some missing tracks, but tomorrow (late) you will have HiRes images of the top and bottom faces of the bare board.

I have a plan to use a light table to backlight the bare board as well as do a regular image of each side. Backlighting really shows up thin tracks well.

Please see the final draft of the Parts List, as there are a few corrections in it now, plus 'as measured' values as all parts were removed tonight.

Looks at first glance that the 4011 is partly being used as an inverting buffer....

Martin

PS. What is the largest file size JPG image I can attach here ?

[Thomas]

unless some tracks are missing, the 4011 does nothing.

[walkman]

PCB maybe that?
Mistakes can happen. only suggestion

[Thomas]

What are you saying with the cryptic picture above ?

I think he is showing that, you can use different coils instead of the original, and he has the characteristics of each shown. some have ferrite bobbins and some don't.

[sinclairuser]

hi been following this thread since the start, and cant help thinking that if you have managed to get it working, then you should continue.
kt315 is right about taking clear pictures, stripping the board and photoing again and testing components to make the parts list, but it did not work before, if you are going to reverse engineer a device, it makes more sense if it works in the first place.
a least now if you strip it take photos and make a parts list, we know it works and any mods done to it will improve it(or not), instead of having to mod the device after just to get it working.

[mr.sneezy]

What are you saying with the cryptic picture above ?

[kt315]

activation for initialization pic

[kt315]

the Project needs::

1. board with components pics in hi resolution at sunny day at open air.
2. desoldered board. pics in hi resolution, of both sides, at sunny day.
3. full part list. every components must be measured individually, not via color code only looking.
4. all transistors must be researched by haracteriograph, or tested on matter they are PNP or NPN structure of.

all the best