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Old 10th October 2004, 09:56 AM   #1
rs1026 is offline rs1026  India
diyAudio Member
Join Date: Jul 2004
Location: Bangalore
Angry toner transfer method(my mistakes)

I tried to build a PCB using toner transfer method and committed two blunders.First of all the design used a opamp and while taking the printout I flipped the image horizontaly.After the PCB was ready I observed that no way I could solder the opamp.Since the image was flipped the pin no 1 of opamp and the PCB did not coincide.

Secondly I coated the pcb with clear lacquer to avoid the oxidation of copper but later only at the time of slodering I came to know that lead did not stick properly on coating of lacquer.

Can someone share their experince on toner transfer method?How to avoid these small mistakes and prevent rework
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Old 10th October 2004, 11:25 AM   #2
rs1026 is offline rs1026  India
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Join Date: Jul 2004
Location: Bangalore
Default SMT issue

I think express PCB has taken the drawing to be SMT mounted by defualt. How can I override this in express PCB?
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Old 10th October 2004, 05:25 PM   #3
rs1026 is offline rs1026  India
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Join Date: Jul 2004
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Default figured it out

i should not have flipped the image. If and only if SMT is used then I should have flipped the PCB image.
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Old 13th October 2004, 01:37 AM   #4
dangus is offline dangus  Canada
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Join Date: May 2004
Location: Vancouver Island
If they are through-hole components, maybe you can just mount them on the wrong side. Machined-pin style sockets can be soldered at the component side, with care. It helps to include text on the PC board, so you can tell at a glance if it is reversed or not.

I've had mixed success with toner transfer. The paper I use is the biggest variable. However, using an inkjet printer and transparency film (doubled up) and positive photoresist produces much nicer results.
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