PCB Etching - Revision history

Sasha: Added sodium persulfate instructions from workshop

2015-01-30T23:10:10Z

Added sodium persulfate instructions from workshop

Noskill: /* See Also */

2014-12-16T10:46:23Z

‎See Also

Nemen: /* Photoresist PCB Etching */

2014-10-16T21:26:52Z

‎Photoresist PCB Etching

Rorist: /* Obstacles */ thats not an obstacle

2012-12-21T08:27:30Z

‎Obstacles: thats not an obstacle

Sasha: Added tutorial link

2012-12-20T23:22:43Z

Added tutorial link

Rorist: /* "Toner transfer" PCB etching */

2012-12-13T21:04:07Z

‎"Toner transfer" PCB etching

Rorist: /* "Toner transfer" PCB etching */

2012-12-13T20:14:03Z

‎"Toner transfer" PCB etching

Noskill: /* Schedule */

2012-12-12T16:42:46Z

‎Schedule

Rorist: /* Schedule */

2012-12-08T12:19:56Z

‎Schedule

Rorist: /* Schedule */

2012-12-08T12:19:17Z

‎Schedule

← Older revision		Revision as of 23:10, 30 January 2015
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	The reaction is (NH_4)_2 S_ 2 O_8 -> CuSO4 + (NH4)_2 SO. The resultant liquid is less harmful than ferric chloride but should still be treated with other chemical waste		The reaction is (NH_4)_2 S_ 2 O_8 -> CuSO4 + (NH4)_2 SO. The resultant liquid is less harmful than ferric chloride but should still be treated with other chemical waste
		+
		+	== Photoresist etching with Sodium Persulfate ==
		+	# Print inversed PCB on two layers of transparencies, and make sure that there is visible text to be able to identify the side later
		+	# Place glossy side of transparency on the glass of the UV exposure box, and the matt side (with the toner) face up - you should be able to read the text inverted now
		+	# Peel back the protective film from the pre-sensitised PCB, and carefully place it over the transparency
		+	# Expose for ~3 minutes (time needs to be experimented with still), with a weight (such as one of the bottles) on the cover for pressure
		+	## Whilst the PCB is getting exposed, pour 1cm worth of soda (french: soude) into a container
		+	## Prepare another container with just water, to rinse of the soda
		+	# Remove PCB from UV exposure box, and place into soda solution. Stir and agitate until the soda and PCB until there are no more violet traces that leave
		+	# Remove PCB from soda solution, and rince off with water in other container - use plastic tweezers to handle it
		+	# Attach PCB to support wire, and place the PCB into the Sodium Persulfate solution, and wait until you can see the resin (should take ~20 minutes)
		+	## Whilst waiting, pour the soda back into its bottle, and rinse the containers
		+	# After you can see the resin, remove the PCB before the traces get etched away, and rinse it off
		+	# Pour Sodium Persulfate back into its container and clean up
		+
		+	(photos to come)

	== Safety ==		== Safety ==

@@ Line 93: / Line 93: @@
 * [[PCB_Fab]]
 * [http://www.engscope.com/pcb-fab-tutorial/ Fairly in depth tutorial]
 == Participant ==

@@ Line 39: / Line 39: @@
 ===Parts===
-*Uv light (UV LED strip or DIY UV LED fixture?)
+* Uv light (UV LED strip or DIY UV LED fixture?)
-*Pre-coated photoresist positive pcb
+* Pre-coated photoresist positive pcb
-*Lye (NaOH)
+* Lye (NaOH)
-*Ammonium persulfate
+* Ammonium persulfate (or Ferric Chloride, available at Fixme hackerspace)
 ===PCB Layout===
@@ Line 55: / Line 55: @@
 Remove the plastic protection on the PCB. Place the printed side of the layout against the copper side of the PCB. Remove the air bubbles captured under the greased paper
-Place the PCB & Layout inside the exposure box. Then let the UV light do the work for 3-4 minutes ''This is a '''completely arbitrary''' timing, we should test different values''
+Place the PCB & Layout inside the exposure box. Then let the UV light do the work for 2 minutes 30 seconds ''This is a '''completely arbitrary''' timing, we should test different values''
 Remove the PCB & Layout from the exposure box
@@ Line 68: / Line 68: @@
 ===Etching===
-The etching solution is a 200g/L ammonium persulfate mix.
+The etching solution is a 200g/L ammonium persulfate mix (or Ferric Chloride).
 The etching process can take to over an hour. To speed up this shit, you can add heat and/or bubbles to the solution.

@@ Line 16: / Line 16: @@
 * Cost
 * Make a lot of dust
 PCB Etching using toner transfer method:
@@ Line 25: / Line 24: @@
 * Need an insolation box
 * Number of step for the process
 == Components ==

@@ Line 16: / Line 16: @@
 * Cost
 * Make a lot of dust
 PCB Etching using toner transfer method:
@@ Line 93: / Line 94: @@
 == See Also ==
 * [[PCB_Fab]]
 == Participant ==

@@ Line 34: / Line 34: @@
 =="Toner transfer" PCB etching==
 * http://www.riccibitti.com/pcb/pcb.htm
-* Test print design : http://www.dr-lex.be/hardware/hwimages/toner-design.png
+* Test print design : [http://www.dr-lex.be/hardware/hwimages/toner-design.png]
 ==Photoresist PCB Etching==

@@ Line 88: / Line 88: @@
 == Schedule ==
-* 13 décembre 2012: First workshop
+* 13 décembre 2012: First workshop [[http://www.doodle.com/8fyynphtyzyi8ika Doodle ]]
 == See Also ==

← Older revision		Revision as of 12:19, 8 December 2012
Line 88:		Line 88:

	== Schedule ==		== Schedule ==
		+	* 15 décembre 2012: First workshop
		+
		+	== See Also ==
		+	* [[PCB_Fab]]

	== Participant ==		== Participant ==