Fran Blanche has this video where she
uses press-n-peel to good effect:
http://www.youtube.com/watch?v=2GoCNKzhWVs#t2m20s
she uses a proper heat press but a flat plate sandwich press would probably be just as good if you can find an old one on trademe (or a really cheap deal at The Warehouse).
Have you tried dry film photoresist? I can send you a few offcut samples for free if you fancy giving it a try, you can apply it easily with a clothes iron (set to about 80 degrees C at the hottest part of the plate) and expose to negative artwork (traces transparent). Detailed instructions for use: http://sparks.gogo.co.nz/dry-film-tips.pdf
Just for kicks, here's a PCB I made with dry film applied with an iron, artwork a single tracing paper laser print coated with a "White Knight Crystal Clear Acrylic" spray can from bunnings, exposed with leds, developed with the assistance of an electric toothbrush in a wood deck cleaner product containing sodium carbonate from the local $2 shop, etched with some completely unscientific cupric chloride ("bit of this, bit of that, eh, I guess looks about right shade of green") heated over an old camp stove in a pyrex dish while being rocked and brushed periodically with a paintbrush, tinned with a solderpaste:flux mix at about 1:3 ratio on my upturned clothes iron and wiped with a dry paper towel, drilled with a 0.9mm bit attached to a DC motor ripped out of some printer running at 24v off a step-up converter powered by a 12v wall wart from the junk bin. Thin traces are about 12mil, a couple of the clearances are that or less where I had to sneak between pads.
On 19/11/13 12:05, Geoff Wood wrote:
http://www.youtube.com/watch?v=2GoCNKzhWVs#t2m20s
she uses a proper heat press but a flat plate sandwich press would probably be just as good if you can find an old one on trademe (or a really cheap deal at The Warehouse).
Have you tried dry film photoresist? I can send you a few offcut samples for free if you fancy giving it a try, you can apply it easily with a clothes iron (set to about 80 degrees C at the hottest part of the plate) and expose to negative artwork (traces transparent). Detailed instructions for use: http://sparks.gogo.co.nz/dry-film-tips.pdf
Just for kicks, here's a PCB I made with dry film applied with an iron, artwork a single tracing paper laser print coated with a "White Knight Crystal Clear Acrylic" spray can from bunnings, exposed with leds, developed with the assistance of an electric toothbrush in a wood deck cleaner product containing sodium carbonate from the local $2 shop, etched with some completely unscientific cupric chloride ("bit of this, bit of that, eh, I guess looks about right shade of green") heated over an old camp stove in a pyrex dish while being rocked and brushed periodically with a paintbrush, tinned with a solderpaste:flux mix at about 1:3 ratio on my upturned clothes iron and wiped with a dry paper towel, drilled with a 0.9mm bit attached to a DC motor ripped out of some printer running at 24v off a step-up converter powered by a 12v wall wart from the junk bin. Thin traces are about 12mil, a couple of the clearances are that or less where I had to sneak between pads.
On 19/11/13 12:05, Geoff Wood wrote:
New here. I'm Geoff from New Zealand. Have been doing PCBs on and off for maybe 35 years, first by resist-pen, then Bishop Graphics and Riston.