Homemade PCB

[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.

[epatto]

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

[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 :-)

[dumyyyyyy]

Great video and awesome work.BUT: The question is: Why so much work with this equipment when same results y have trough toner transfer method?

[nagyizee]

@dumyyyyyy Toner transfer is sort ok OK for traces wider than 0.3 mm, even then you need to thoroughly check for interruptions;

but it is useless for 0.15mm traces I am using now.

I struggled a lot with toner transfer method, since I use the optical I have virtually 0 failure rate.

[billynightmare]

can you send me the sketch for that light? looks awesome

[Wubu11]

Nagyizee;

This is a very slick video. Really impressed. If you have it the schematic and any files of the PCB would be really appreciated. i would love to make your one of your exposure devices. The ability to dial up the time makes the process even easier.

Many thanks.

Wubu11

[nagyizee]

I will make a blogspot entry, with schematics and firmware and put the link to the description,

just to have time for creating it.

[Wubu11]

@Wubu11

Thanks , i will look forward to it. Great photos on your blog.

[Andre48CAD]

what is the name of the song that plays in the video?

[nagyizee]

the first one: Forrowest - Forro In The Dark, but I don't have the name of the second two 

[aeriusmetal]

Do you have a tutorial on how you did your Custome UV Exposer Device?

[nagyizee]

Unfortunately I don't have, but it is easy to do:

I used 2x 5W high power SMD UV LEDs with 80* vizual angle, linked in series and powered from 12V through an LM317 current stabilizer.

The LEDs are put together closely (to have spot light for greater contrast) on a larger PCM (to act as heat sink), and mounted on a pole to have ~20cm distance from the exposing surface.

The whole thing can be connected to a timer to don't worry about accidental overexposure

[alexmartinez2000]

@nagyizee What im more interested is in the schematics and the programming (code), i want to create one using an arduino chip and a H44780 LCD.

[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")

[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

[modheadify]

great vid i would love the shematic or pcb design for the uv timer.

if this is possible.

[B4IRUTUARU16]

Thank you so much

Very informative video :)

[nagyizee]

Thanks :-)

[TCPCruscottoSuperpiu]

Great tutorial. I would appreciate if you tell us what product did you use for the final coating. It wouldn't be possible to create a mask to coat just the vias and not the pads? Anyways, very professional result and really interesting.

[Th3Su8]

Very nice. I really like your exposure lamp you made. Looks real good. Where do you source the solder mask laquer? I have had dificulty locating anything like it.

[TCPCruscottoSuperpiu]

@Th3Su8 I think it's more practical to use the Dynamask film you can buy it from octamex.de

[nagyizee]

Thanks, :-)

I got my lacquer from a local electronics shop in my country, it has no brand or something.

but you can try to search at farnell.com, and search for solder mask or solder resist

[refa42]

@nagyizee That laquer is Positiv 20 which is a product in Kontakt Chemie (electrical/electronics) line from CRC Industries. I have that same stuff in my fridge along with SK10 flux.

[nagyizee]

@refa42

We were talking about the green solder mask lacquer, the positiv20 is the photoresist, and I also have it in the fridge :-D

[refa42]

@nagyizee sorry I got photo and solder resist mixed up. Seeedstudio has solder mask inks. I'd link it but this doesn't allow urls.