Using Double-sided Presensitized PCB (a technique)

[paranz]

I'll share my technique kung paano magawa ng PCB for your circuit, using a double sided presensitized PCB.

One of the major difficulty in making a double-sided PCB is the proper aligning of pins/pads/holes in both PCB sides. I hope that by using this technique, mas mapadali ang pag-align.

I'll be using a 10 x 7.5 cm double-sided presensitized PCB i bought from e-gizmo (10 x 15 cm i cut in half  ).

I will also need an illustration board and a scotch tape.

[paranz]

i will cut an illustration board to a size much bigger than my double-sided PCB. Refer to figure below.

[paranz]

then, i will cut (using a cutter  ) a 10 x 7.5 cm area in the middle of the illustration board, in order for my PCB to fit in.

The PCB is inserted, to test if it fits.

[paranz]

at the same time, print ko muna ang dalawang PCB design from Ultiboard to a either a tracing paper or acetate.

I'll be using a tracing paper (much better if acetate since its transparent, unfortunately i dont have one at the moment  )

[marcelino]

wow!!! talgang ginawa na ni sir Paranz ha!

thanks!:)

[paranz]

i taped 1 of the design (also a 10 x 7.5 cm, bottom layer) to 1 side of the illustration board and i make sure that the printed design aligns to the 10x7.5 "hole" area on the illustration board

[paranz]

wow!!! talgang ginawa na ni sir Paranz ha!

thanks!:)

hehe better late than never 

[paranz]

then i taped the other design (top layer) to the other side of the illustration board

[paranz]

ganito ang itsura when both designs (copper top and copper bottom) are taped

[paranz]

align the 2 designs properly, so that pad/holes/pins on each design matched properly. Add more scotch tape para hindi na ma-moved ang dalawang tracing paper. This is critical, or else you will get misaligned (a useless) PCB 





since im using tracing paper, medyo nahirapan ako ng kunti sa alignement kasi hindi transparent. Much better if acetate ang gagamitin. But i still use tracing paper since it is much cheaper

[paranz]

now, its time to expose the double-sided PCB.

insert the PCB (with the white coverings removed already  ) carefully to the illustration board. Make sure you don't misalign the 2 tracing paper! Or else you have to align them again.

Then, expose the 2 sides, 1 after the other, to your favorite UV/light source.

I'm using my own fluorescent lamp for PCB exposure.

[paranz]

i removed the the PCB from the illustration board, treat it with the developer solution (to removed exposed portion), and here is the result


copper top layer:



copper bottom layer:

[Ikasamoko]

kakagawa ko lang ng K149BC na USB/Serial programmer..double sided pcb..wala ako makuna ng ordinary PCB FR4 lang available..ginawa ko single-sided then dinikit ko lang yung dalawang single-sided..
badtrip! di ko napansin...di pala mirror pa toner transfer ko!!  

Sayang lang..

[paranz]

then i etched the PCB.

Afterward, i inspected the PCB and the holes/pins perfectly align in each sides.

[Heuriskein]

Sir paranz ano po ba maganda pangputol ng presenboard? Ito kasi nabili ko sa alexan malaki than what i need sayang naman .okey lang po ba yong cutter lang, di ba masisira yong board?

[DigiEX]

Sir paranz ano po ba maganda pangputol ng presenboard? Ito kasi nabili ko sa alexan malaki than what i need sayang naman .okey lang po ba yong cutter lang, di ba masisira yong board?

Lagare ng bakal.

[xozip_neutron]

sir pano po ninyo nalink ang magkabilang side ng inyong pcb?

[carlsfootprints]

ngaun ko lang nakita tong thread na to.. hehe..

pogi ulit ni sir paranz

matry nga to minsan.. hehe..

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Sir paranz ano po ba maganda pangputol ng presenboard? Ito kasi nabili ko sa alexan malaki than what i need sayang naman .okey lang po ba yong cutter lang, di ba masisira yong board?

likod ng cutter pwede.. un ang ginagamit ko ngaun.. dati lagaring bakal din..

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sir pano po ninyo nalink ang magkabilang side ng inyong pcb?

wat do you mean na link? you can see it naman po sa illustration ni sir paranz.. hehe.. critical lang talaga ung part kapag ilalagay mo na ung pcb mo..

[nucleus]

mas mabilis talaga yung fine tooth na hack saw/lagating bakal kelangan lang ng matatag na pagpapatungan

[carlsfootprints]

mas mabilis talaga yung fine tooth na hack saw/lagating bakal kelangan lang ng matatag na pagpapatungan

ako naman.. mas straight ang cut ko sa cutter kaya nagswitch na ako