[OZAPRS] Wanted: Pre treated PCB

[vk4tec at people.net.au]

   I have got the process down pat, its the material thats in short
supply.

   Last night I made one of the best ones yet, even under a microscope it
looks
   good.

   On Thu Sep 6 3:46 , Ray Wells sent:
   
     Forgive me for disagreeing with you David but I used Riston for years
     before I changed to a positive resist board and never previously had
I
     obtained such repeatable, predictable results. The positive process
may
     have cost a bit more but the results were worth every cent.
     Ray vk2tv
     David Hopkins wrote:
     >Andrew,
     >The negative process is far superior and in the long run costs much
less.
     >Only disadvantage is the reversal film. However you can reverse the
     >artwork in software.
     >Once you are setup you cam make double sided boards at will.
     >
     >Have a look at RCS components in Sydney.
     >
     >The developer for the dry Riston photo resist is washing soda. It
     >costs about $25 for 20Kilos.
     >You use 8 teaspoons to 4 liters.
     >
     >I can give you any amount you require. I bought a bag about ten
years
     >ago and can't see any reduction in quantity even after making a
     >couple of hundred boards.
     >
     >Been using the negative process for about 40 years and works without
a
     hitch.
     >
     >David
     >
     >At 06:05 PM 5/09/2007, you wrote:
     >
     >
     >
     >>I am looking for a supplier of quality positive acting pre-treated
PCB.
     >>
     >>I have tried DSE boards, they dont use proper fibre glass.
     >>
     >>Jaycar have negative acting.
     >>
     >>Any ideas ?
     >>
     >>
 
>>------------------------------------------------------------------------
     ----
     >>Andrew Rich VK4TEC
     >>[1]vk4tec at people.net.au
     >>[2]http://www.tech-software.net
     >>
     >>
     >>
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     >>
     >
     >David G. Hopkins (Vk4ZF)
     >CAPALABA QLD.
     >AUSTRALIA
     >S27 32.191 E153 11.867
     >
     >
     >
     >
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