northwest Revisiting Home brew Plate Through Holes
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QED is here! ML have NOT stopped the QED!
Goldsearch Australia has been appointed the Australian Distributor for the QED. QED info on the Goldsearch website has been updated.
This is the only forum where you can talk directly with the designer/ manufacturer of the QED!
Jrbeatty and Reg Wilson  and  Yellowfin have NO vested  or pecuniary interests(or secret deals or cash for comment or any other undisclosed benefits )in the QED other than using it to find gold which it is doing very successfully!
Over the overwhelming majority of typical Gf ground the QED GB works just fine! Another new user has used his QED over "fairly difficult ground around Waanyarra and Kooyoora areas  " and not reported any GB problems!
The so called QED GB problem is just  more fake news created by  some fake, delusional and dishonest imbecile cretins on 1/2 wits (who is a proven forum hacker and liar and  just dumb!) pox, liars and abomination and disgraceful atrocity sewer rats "forum" that have never used a QED! The QED has been used successfully to detect under 300k steel tower transmission lines(try that with a gp/gpx  with a mono coil!!!) so it  can handle bad  EMI! The QED will also run quite and stable in a household with electrical appliances running.Try that with a ML with a mono coil!!! "QED matches and and in most cases outperforms the SDC"  and will thrash it for depth on bigger gold. QED sales are still strong so if you are on the waiting list please be patient as BW is working 12 hours a day to try and reduce the waiting time.
Except for the USB port the prototype QED's are identical in EVERY respect to the production models and according to the designer  the production models may even be  better!
4umer makes another liar a moderator! How low can 4umer go!

australian electronic gold prospecting forum.com  |  DIY forum  |  DIY forum  |  Topic: Revisiting Home brew Plate Through Holes 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Revisiting Home brew Plate Through Holes  (Read 361 times)
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« on: Monday May 12 2014 21:49:12 AEST PM »

Following on from this thread :   

I always thought it would be great if this could be done at home. I found plenty on the internet about making your own conductive ink, and I also found various links mentioning another process suitable for creating a conductive layer through holes and which can be plated to provide a robust connection. It all seemed to involve a lot of fiddling and jumping through hoops to get certain chemicals.

But over the weekend I revisited some of those old saved links and found some new ones which I would like to put here.


  

The above "instructables"  link is by authored by Sergiy Yevtushenco. Its based on method used in the old Soviet era. With the changes that took over, i.e Western influence, investment, methods - this process was almost forgotten. But it has regained some popularity amongst hobbyists,  worldwide. He gives a some useful tips in the comments section of his instructable.

  

Another link detailing the process. Part 5 very useful for anyone having trouble finding affordable calcium hypophosphite, and shows how to easily  convert cheaper and more readily available sodium hypophosphite into what is needed.

A youtube video showing the activating and plating :   

And a constant current circuit for use in home copper plating :   

So for anyone that is already setup for home photo-etching, and has a supply of copper clad board and dry film photo resist and suitable psu, the above links should offer some good leads on how to do it at home.

With practice, a layout like this one created by Mechanic (    ), could be done at home and result in a ready to solder board - in a few hours.
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