Homemade PCB

Short film about how to make double sided pcbs with perfect layer alignment using lithographic technology at home.

Two things are still missing: copper plating of the vias, and lithographic method for solder mask.

The process last arround 3-4h, and the result is very satisfying

Category:

Science & Technology

Tags:

• homemade
• double
• sided
• PCB
• circuit
• board
• UV
• LED
• exposure
• lithographic
• Positiv
• 20
• photoresist
• developing
• etching

[xKatjaxPurrsx]

Where do you got your Positiv Spray? It seems impossible to find in the US!

[nagyizee]

@xKatjaxPurrsx

I live in Europe, we have it in almost every electronics store.

It is produced in Belgium, it should be exported in US also.

[odv000]

how do you print thous transparent films?

i use transparent film for overhead projector and laser printer, but i often got defects, tried different films and printer - same result, and it is not too black either if i look through it on lamp, so i have to print two copies and stick them together with double sided stick tape, which decreases resolution,

BTW did you thought about using projector for projecting on pcb directly from computer? would it work?

[nagyizee]

@odv000

Hi,

I made my first film as you described, set the printer to max quality, printed two films for each side - one mirorred, one direct to have the toner on the same side when you glue together, this way you get better contrast. I glued together with superglue. The result was pretty satisfying on 0.3mm traces, but on large areas it still produced some holes.

You have to experiment with exposure time, because the film is still sort of transparent. I used 7min with 10w UV led.

[nagyizee]

@odv000

now I am using a lithographic printer which creates high optical quality film. A friend of mine is working with typography and he has such a printer

[dumyyyyyy]

If you need such precise PCB and traces then you right. My apologies . Anyway, great video ant tools you have!

[nagyizee]

no problem, an thanks :-)

[epatto]

Hi. Excellent tutorial video. Keep up the good work!

[nagyizee]

@valiza123 Lm317 inca e in parametrii, am 1.2A pe el, ledurile merg cu 4.2V (8.4V in serie). L-am lasat functionand jumat de ora si temperatura pe chip a crescut la 75*C. Probabil ar trebui un heatsink mai mare dar am vrut sa-l tin low profile.

Pentru soldermask incearca lacul de la tekro.ro (e la accessori circuite imprimate), eu sunt multumit cu acesta.

Numai bine,

Arpad

[valiza123]

@nagyizee Nu esti peste limita cu lm317, la 5w are nevoie de 1.6 amperi nu?

Felicitari pentru video arata foarte bine placile si statia de expunere. Mi-am luat un fel de "pebleo vitrea" pentru soldermask, dar pana acum nu mi-a iesit... (am vazut "picatura")