| rs1026 |
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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| rs1026 |
| 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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| rs1026 |
| 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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| dangus |
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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