Tuesday, May 26, 2009

PCB UV Exposure Box DIY

Since some of you are wondering how my UV exposure box looks like, I shot the photos below for your viewing pleasure. The unit uses 2x8W UV lights obtained from Farnell. The box was fabricated from HDF board (the same board used by picture frame shop) and the exposure area was lined with aluminum foil to improve reflectivity. The tubes are about 4" apart and 4" below the frosted glass. The frosted glass is intended to diffuse the UV so that there are no UV bright spots.


I've also made a simple PIC-based timer to time the exposure. Using the Kingsten PCB, exposure is 90 seconds. I use inkjet transparencies to make the exposure film. So far, I've managed to get 0.25mm track with 0.25mm separation with no problem. PCB are developed using NaoH developer and etches using Fe2Cl3. From exposure to PCB ready to drill in less than 20 minutes. I'll never go back to iron-on method... :-)

22 comments:

M.Zaifful said...

Dear Basir, tonight you boleh bawa tak exposure kit nie, i want to take a look , jam berapa selalu sampai kesana?

Basir Atan said...

If you want, I can bring it tonight... I'm normally there around 9pm...

M.Zaifful said...

Salam,Hi Basir, i came to the edge where i can't completed the foxhunt transmitter, due to hard to find copper wire to suit for 25 turn coil.Well this time i have to get help from you, how to make a fine winding for 25turn wire coil, Thanks for the help.

9M2IBR said...

Saya baru siap uv box..tapi pakai lampu pest killer je. So far performancenya superb. Takde timer..thanks sebab sudi kongsi ilmu.

9M2IBR said...

One more question..what type of transparency film u use? where to get?

Basir Atan said...

I used transparency film for inkjet printers... beli kat lowyat.... tak ingat brand... so far okay... does not smear even after few months...

Basir Atan said...

Bro... put lar some picture... share dengan yang lain... MYZ pon dah tak sabar nak buat... he he...

9M2IBR said...

next week ada course kat capitol hotel then saya g lowyat. Film utk inkjet tu boleh guna utk laser ke? berapa harganya?

9M2IBR said...

Gambar dah bubuh kat my blog. Tapi tak ler secantik mana..he he

Basir Atan said...

Inkjet transparency takleh pakai kat laser... cair bang... kalau laser, beli transparency untuk laser... harge tak ingat... dah lama beli... bertahun... :-)

9M2IBR said...

itu tanya tu. Kena cari yg laser punya transparency. Harap2 kat loyat ada. :-)

Basir Atan said...

Lowyat semua ada... anyway, I've tried laser transparency... cannot beat inkjet... laser so far got a lot of pinholes... last I used was tracing paper... before use, scrup with scouring pad biar dia kasar...

Good job on the UV unit... murah, berkesan dan cepat... ecthing can reduce time using aquarium air bubbler...

9M2IBR said...

then nanti saya try dua2..laser and inkjet. saya buat pcb kecil2lan je. Etching pun guna tupperware. hi hi. anyway..tnx fer info.

M.Zaifful said...

sempoi gak idea 9M2ibr, bleh try, hehehehehe.

9M2IBR said...

itu je yg termampu..hi hi..

fadyl said...

salam, brape kos uv exposure box ni? ade skematik untuk wiring x? ingt nk buat satu la :)..

Basir Atan said...

I suggest you make something similar to the one below... cheap and easier...

http://9m2ibr.blogspot.com/2009/06/introducing-my-uv-exposure.html

fadyl said...

dh tgk yg 9m2ibr punye..tp xtau plak nk cri kt ne pest killer..
basir, ade ambik tmpahan pcb jgk ke?

Basir Atan said...

Fadyl,
Where are you located? Mana lah tau ada kekawan yang boleh tolong belikan... :-)
Saya buat PCB untuk kegunaan sendiri jer... tapi kalau sekadar tolong menolong kekawan, tak de hal la... you nak buat PCB apa dan banyak mana... you can email me for further discussion... 9w2bsr @gmail.com

Anonymous said...

what resist are you using to make pcb's and where are you getting it?
k7da

Anonymous said...

very similar uv box project:
http://www.qubbeks.puslapiai.lt/articles.php?article_id=25

Qubbeks said...

http://www.qubbeks.puslapiai.lt/articles.php?article_id=25