Differences

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--- ee:pcbetching [2019/01/11 12:54] – FKR@staff.hsrw
+++ ee:pcbetching [2024/12/12 14:29] (current) – FKR@staff.hsrw
@@ Line 1: / Line 1: @@
-===== Etching PCBs =====
+====== Etching PCBs ======
-==== Disclaimer ====
+===== Disclaimer =====
 This instruction has been written for a supervised session performed in a chemical lab. Be careful when applying to a different environment.
-==== Introduction ====
+===== Introduction =====
 This instruction is about producing printed circuit boards (PCBs) from already prepared designs. There are two major techniques for PCB manufacturing. For prototyping purposes it is popular to use a special milling machine for PCBs. The faculty uses a LPKF ProtoMat S62 in its [[ee:electricalworkshop|electrical workshop]]. EAGLE board designs are exported to gerber and excellon files and after making some adjustments in a CAM tool like CircuitCAM designs can be used for milling out copper-clad boards. The machine isolates all traces on the board and drills holes where necessary.
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-==== Resources ====
+===== Resources =====
 Here is a list of supplies you probably need:
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   * lab coat
   * gloves
+===== Procedure =====
 ==== Masks for uv exposure ====
 The PCB design should already be finished and the artwork should be ready. If not there is a separate guide on how to [[pcbuvmasks|create masks for uv exposure]].
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   - Use ethanol and paper tissue to remove the remaining photoresist from the board(s). Be thorough.
   - Let the board(s) dry. You can also use compressed air to speed things up.
+  - If you do not plan on soldering the PCBs on the same day, use solderable protective resin ("Lötlack") to protect the copper from oxidizing.
   - Clean the lab equipment, rinse everything with water.
   - Dispose of waste properly.