PCB Photoresist Searching in India

[shivkrish39]

photoresist pcb

HI,

I am from india. I would like to try the Photoresist PCB method. In India neither Photoresist spray nor chemicals available.

Anybody from india, please help gtting photoresist spray in india or any alter method.

I am not interested in heat transfer method since no printable sheet in india giving results.

thks.
Shiveni........

 

[IanP]

pcb photo resist

It is difficult to imagine that you can't get something in India ..

Try, for example, RS-Components & Controls (India) Ltd.
www.rsindia.com

Part number: 198-9651
http://www.rssingapore.com/cgi-bin/...wType=text&SearchText=198-9651&quickSubmit=Go

Regards,
IanP

 

[vikadik]

pcb photoresist

Well r u sure what you want to do

If you select the wrong type you might find things going wrong and anyway rsindia is very costly. Another place one can try is the lajpatrai market in delhi

 

[centiago]

pcb photoresist spray

Hi,

I think all major cities where PCB is manufactured should have vendors dealing with raw materials.
You can make BLACK BOX using UV tubelights, electrical connection is same like your normal tubelight. The same box can be used for EPROM erasing.

Ferric chloride (for etching) are readily available.

Here's a link that deals with PCB Manufacturing process. http://www.ee.cuhk.edu.hk/~ymfung/ppp/etching.html

I wonder how will you do solder mask & tin plate the PCB.

Good Luck

 

[shivkrish39]

how to make photoresist pcb

thanks guys....

I have two choices=== one is RS components and the other one is farnell.

But very costly.

I am now tring offset printing method...

technova sesitizer a&b and apply to copper clad board.
expose to sunlight with negative film....
devoloping the image with nova black diamond..

any other method similar to this available?.....

 

[shivkrish39]

ph4 photoresist

hi,

any offset plate printing method available?

anybody has used PH4 method?.. if yes please give me some details.....


anybody from Coimbatore?..

 

[kasamiko]

make pcb photoresist

I'm using a positive photo resist pcb and a good sunlight to exposed it and been having a good result..

I'm using a KINSTEN Presensitized Positive (+) Acting PCB.

a 4x6" single-sided board cost about US$2.0..

 

[shivkrish39]

positive resist pcb

Hai guys,

I have tried Photo sensitizer a&b with devoloper used for offset printing.

The first phase was successful. after exposed to sun light & devoloping the circuit tracks are perfectly devoloped in the PCB.

after cleaning with running water when putting into ferric chloride sul. every things were washed out (all tracks ).

any solution to remove only Cu part or any alternate to Ferric chloride?...

i think the sensitizer is not etch resistant..if this part works fine i think we can make very profesional PCBs in low cost.( sensitizer Rs50 (for 100ml)+ devoloper Rs 250 (for 1 litter) )

 

[platonas]

dry flim pcb india

shivkrish39,
It seems that you overexposed your PCB. In direct sunlight you need around 12 seconds of exposure.

Another one thing I noticed, you didn't mention NaOH (caustic soda) usage after exposing the board to sunlight. This is used to fix your possitive spray.

Regards
P.

 

[shivkrish39]

kinsten presensitized pcb

Hi,

but i have tried different timings starting from 10s to 3 mins.

Since i have used photo sensitizer a&b used for Offset printing plates i used black diamond devoloper for devoloping. after the image devoloped in the PCB i tried to put it in Ferric chlorid but it reacts with the complete PCB.

 

[ahmad_abdulghany]

photoresist positive pcb

I tried many times to make a PCB using Positive 20 photo resist but everytime i got bad results,

I hated to use Photo resist,

and i am looking for a low cost solution away from the Peers N Pell sheets and photo resist..

Any suggestions?!

 

[rajudp]

positive photoresist pcb

i am using dry film photoresist and give good results

 

[shiveni]

presensitized board in india

hai I am trying to get Dry Flim Photoresist in india. Can anybody help in getting it in small quentity.

Shiva...
microkid.co.cc

 

[rajudp]

how to make pcb photoresist

if you want only small qty i an help

 

[mvs sarma]

how to make a photoresist pcb

hai I am trying to get Dry Flim Photoresist in india. Can anybody help in getting it in small quentity.

Shiva...
microkid.co.cc

pre-sensitized boards can perhaps be bought either from RS Controls India or from Farnell India.
the spray could not be obtained when ordered, as air flying of hazardous material is not approved.
Of course, the possible best id TTS method. and it works as I made few boards.

No point in spending a moon unless you specifically need it. In few such cases , I feel , it would be better to do all your work, even make positive and negative films , and let a local manufacturer make few boards like 5, for you.

 

[mvs sarma]

signs of bad photoresist

if you want only small qty i an help

is it positive or negative resist film, Rajudp ?

 

[FvM]

positive resist pcb sun exposure time

As far as I know, only photo-positive resists have been used for PCB prototyping sinces decades.
The coated PCBs available from catalog distributors are exclusively of this type.

 

[endril]

photoresist pcb

A good alternative (i think cheep too) is a print of your layout with copier printer(laser - toner) to a glossy paper and termicaly transfered on your coper board with a common clothes iron. Search on the web or ask fore more details.

Sorry if is off topic. GOD SPEED !

 

[rajudp]

positive pcb spray

dear mvs sarma
it is a negative working one laminar 5038

 

[mvs sarma]

positiv 20 expose pcb

dear mvs sarma
it is a negative working one laminar 5038

Thanks Raju jee

@endril, I have been already doing the toner transfer system reasonably well.

@FvM-- The dry transfer films used by industry to make prototypes, are generally negative, and i saw them being used by PCB manufacturers. with that in mind, I was asking Rajudp.