[OZAPRS] Wanted: Pre treated PCB

[Ray Wells]

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
>>vk4tec at people.net.au
>>http://www.tech-software.net
>>
>>
>>
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>>5:54 PM
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>
>David G. Hopkins (Vk4ZF)
>CAPALABA QLD.
>AUSTRALIA
>S27 32.191 E153 11.867 
>
>
>  
>

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