pcb

[C.Pruysers]

After fooling around for many years with reflex-film , I decided to try something else . ( the cost of the film realy went overboard here in Holland ) . I used ( Rotring ) semi-transparent paper . Step 1 ) make a clear copy out of a book or other source . 2) use this copy on your scanner to print with the help of your printer onto the semi-transparent paper 3) let dry and use on the copper plate to transfer circuit . Taking the quality of the copperplate in mind , I came to a time of 40 seconds with a Osram Nitraphot 250 Watt at 50cm distance above the plate . Wonderful result and cheap ! Kees

[C.Pruysers]

Re: pcb

Oh Boy did I make a booboo . To burn the circuit into the copperplate you should use UV light . NOT the Osram lightbulb . The Osram light is for the reflex-film . But .... as a cheap UV light I used the Philips facial tanner . Sorry , should lay off the juice sooner . Kees

[Jan]

Re: pcb

Kees,

Another possibility:

1) Print or photocopy the PBC design on normal paper

2) Spray very thin oil on the back of the paper
It makes the paper transparent.
I use Balistol oil, but I think any thin oil will do.

3) Light for about 10 minutes with UV
I made a box with 4x 40W UV TL-Tubes, one set of 2 lights for bottom and one set of 2 lights for top.
So you can make doublesided PCB's.

4) Develop with 'drain cleaner' (6 teaspoons in 2 liter of water

5) Etch with ironchloride

I can make PCBs with very thin lines using this method...the thinest traces Ultiboard has.

Best regards Jan.

[C.Pruysers]

Re: pcb

Jan . What is the distance UV to Paper ? Are the teaspoons American or European tea spoons ? When I use the semi transparent paper ( trademark Rotring ) the UV is at a distance of 15cm / 7 inches . The time 45 seconds . I will try yor idea also . Thanks Kees

[Jan]

Re: pcb

Kees,

The distance is about 15-20cm.
2x UV Tubes at top and 2x at bottom (15W per tube)

Teaspoons are European, but the size is not really critical.
The water has to be lukewarm.
Develops in a about 30 seconds.
Use the crystals that are sold at Kruitvat Drogisterij.
Take the cheapest (white cristals), the more expensive (Blue cristals) do not work.

I use standard paper and a HP deskjet to print the PCB.

Any really thin oil should do the trick, but I use Ballistol because it a) works very good and b) comes in a spraycan.

A word on Ballistol.
I never found a better oil than this stuff.
Even tools that were rusted and could not be used will work after you spray some Ballistol on them.
The oil was used in the first worldwar by the German army to clean their weapons with (hence the name Ballistol)
They found out that they could use this oil for virtual everything including treating their wounds.
I also use it to treat cuts and infections, and it works perfect.

If you have a chance you should buy a can... success garanteed.
In Holland you will have to look for a Gunshop, they might have it.
I buy it in Germany at the local shop.

If you want a can but cannot get it, drop me an email and I will send you a can.

Best regards, Jan