#5 H2O2 - Applying Transfer paper to PCB, Part 4 of 4

[IBeHoey]

Nice vid and tutorial.

Ive been etching my own boards now for a short while but keep encountering a problem when using photo paper (or any paper). My traces keep wanting to bleed into one another when I apply just the littlest of pressure. At first I thought the paper was just smudging on me but it isnt. Ive since moved onto using transparency paper with greats results but seeing how everyone uses photo paper, it justs bugs me that I could never get it to work.

[IBeHoey]

If you havnt tried using transparency paper, you should give it a go, it works really well. From the time I start to iron it on, I can have the board ready to etch in a little over 5 minutes (not including a few touch ups with a sharpie). (I think) Because the trans paper is plastic based it dosent absorb into the paper so it transfers over to the board easier. Another nice thing about it is once you let the board cool off for a min, the paper peels right off (easily) with out the need of water.

[H2O2FromH20]

When I print on photo paper, I will tell the printer is a transparency, It make it thicker! Sound like to much pressure. Maybe uneven pressure! Try reducing the heat maybe your toner has a lower melting point. What is the Transparency you are using, Part Number, name, manufacture, and store you bought it from. I am interested in the reduced time. Removal of the paper is best if left in soapy water over night. Can you give me any tips on how to apply it? Thanks!

[capacitor70]

Problem with photo sensitive is proper timing and light concentration is required.

[najman100]

nice demo .

Have you ever worked with photosensitive pcb ?

all you have to do is print your design on clear paper top it with glass apply light and 5 minutes later remove dip int in sodium hydroxide and you have your pcb waiting for etching .

i never liked the transfer paper because of the touch ups .

did you make the changes on the pcb ?

[H2O2FromH20]

H2O2 PWM V2.0.1 is complete. I was able to make the two large caps fit and the Voltage regulator, I have proofed all the components and traces there should be no problem assembling.

Najman100, I have the copper board, lots of it. And wanted to keep the cost down for amateurs. Special light, tanks and glass. Over and above the etchent, tank and paper. maybe And for the touch up,

[H2O2FromH20]

There was only one real touch up on the board. the trace on the edge was caused because the board was to small, and the vias I chose to do. However there is the time factor. I will be letting it soak over night and see it that makes it easy.

Do you think Potassium hydroxide would work as developer on photosensitive pcb?

[najman100]

naoh as developer i never used anything else be careful with the concentration.