Developing the Board - Revision history

Aplstudent at 19:43, 9 March 2019

2019-03-09T19:43:38Z

Aplstudent at 19:35, 9 March 2019

2019-03-09T19:35:14Z

Aplstudent at 19:34, 9 March 2019

2019-03-09T19:34:01Z

Aplstudent at 01:07, 8 March 2019

2019-03-08T01:07:26Z

Aplstudent at 01:06, 8 March 2019

2019-03-08T01:06:18Z

Aplstudent at 01:02, 8 March 2019

2019-03-08T01:02:26Z

Aplstudent at 01:09, 2 March 2019

2019-03-02T01:09:20Z

Aplstudent at 20:01, 20 February 2019

2019-02-20T20:01:25Z

Aplstudent at 20:01, 20 February 2019

2019-02-20T20:01:11Z

Aplstudent at 20:00, 20 February 2019

2019-02-20T20:00:36Z

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-To develop the board, you will need a room-temperature bath of NaOH and latex gloves (the NaOH is somewhat caustic and shouldn't make contact with your skin). The NaOH comes in granule form and must be mixed with room-temperature water (do not use hot water). Every, 10 grams NaOH must be mixed with 1 liter of water. Using an electronic scale, measure 2.5 grams of NaOH, and using a graduated cylinder measure 250 milliliters of water, then pour the contents into a plastic tray (the solution will react with metal so do not use a metal tray). Mix the NaOH/water solution thoroughly to ensure that you board develops evenly.
+To develop the board, you will need a room-temperature bath of NaOH and latex gloves (the NaOH is somewhat caustic and shouldn't make contact with your skin). The NaOH comes in granule form and must be mixed with room-temperature water (do not use hot water). Every, 10 grams NaOH must be mixed with 1 liter of water. Using an electronic scale, measure 5 grams of NaOH, and using a graduated cylinder measure 500 milliliters of water, then pour the contents into a plastic tray (the solution will react with metal so do not use a metal tray). Mix the NaOH/water solution thoroughly to ensure that you board develops evenly.
 Once the solution is well mixed, use a gloved hand to gently submerge your PCB (the layers of photo resist can be damaged if the PCB isn't handled with care). The photoresist on the board should begin to "smoke" off immediately and you should keep the board moving to ensure fresh NaOH covers the board. The pattern of your artwork should become visible as the board develops.
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-Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer during the etching process.
+Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer during the etching process. This doesn't always work but it is better than leaving the copper completely exposed.
 (Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")

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 To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.
 After your board is developed you will have an exposed layer of copper, which will be etched away, and green traces of photoresist, which will protect the copper layer below. After developing, but before etching, the board will look like this:
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 Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer during the etching process.

← Older revision		Revision as of 19:34, 9 March 2019
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−	Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer ~~below~~.	+	Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer during the etching process.

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 After your board is developed you will have an exposed layer of copper, which will be etched away, and green traces of photoresist, which will protect the copper layer below. After developing, but before etching, the board will look like this:
-[[File:]]
+[[File:Developed PCB PM.png]]
 Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer below.

← Older revision		Revision as of 01:06, 8 March 2019
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	[[File:]]		[[File:]]
		+
		+
		+	Note: if any photo resist is accidentally scratched off you can make a series of dots with a sharpie, this process uses to ink help protect the copper layer below.

← Older revision		Revision as of 01:02, 8 March 2019
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	(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")		(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")
		+
		+	After your board is developed you will have an exposed layer of copper, which will be etched away, and green traces of photoresist, which will protect the copper layer below. After developing, but before etching, the board will look like this:
		+
		+	[[File:]]

← Older revision		Revision as of 20:01, 20 February 2019
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	To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.		To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.

−	(Some of this tutorial is based of Professor Steck's tutorial in his book "Analog and Digital Electronics")	+	(Some of this tutorial is based on Professor Steck's tutorial in his book "Analog and Digital Electronics")

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-Prepare the board resist developer solution using 10g of pure NaOH granules (meter using analytic balance) per liter of water (about 250ml in the small tray more than suffices). Room-ish temperature is sufficient, hot is bad (accelerates development and punchthrough, potentially just stripping all resist from the board).
+To develop the board, you will need a room-temperature bath of NaOH and latex gloves (the NaOH is somewhat caustic and shouldn't make contact with your skin). The NaOH comes in granule form and must be mixed with room-temperature water (do not use hot water). Every, 10 grams NaOH must be mixed with 1 liter of water. Using an electronic scale, measure 2.5 grams of NaOH, and using a graduated cylinder measure 250 milliliters of water, then pour the contents into a plastic tray (the solution will react with metal so do not use a metal tray). Mix the NaOH/water solution thoroughly to ensure that you board develops evenly.
-Holding the board in a gloved hand, immerse and gently swish/agitate it. You should promptly see green streaming/boiling/clouding off the board and the emergence of the artwork pattern. Inspect closely every 30 seconds or so - the exposed copper to be etched should be bright and shiny. Any hint of gumminess means that there is a thin film of resist still clinging to it.
+Once the solution is well mixed, use a gloved hand to gently submerge your PCB (the layers of photo resist can be damaged if the PCB isn't handled with care). The photoresist on the board should begin to "smoke" off immediately and you should keep the board moving to ensure fresh NaOH covers the board. The pattern of your artwork should become visible as the board develops.
-If the developer is fresh, this gumminess means that the board was underexposed. There's nothing to lose at this point by keeping going in development to see if it will clear. It will not be too very long before the caustic will begin to strip the unexposed resist as well, however.
+Check your board every 30 seconds to see the progress. When the copper layer is exposed and shiny you are almost done. Once it looks as if all the photoresist has been removed continue moving the board in the solution for 30 more seconds. Then, remove the board and run it under cold water and be sure to avoid dripping developer during the transfer process.
-Once done, rinse both sides under fast running cold water to get the caustic off. Gently DAB dry using a paper towl. DO NOT rub: The resist isn't a delicate flower but it's not that tough either.
+To dry the board, gently DAB the surface using a paper towel. DO NOT rub the board; the resist isn't a delicate flower but it's not that tough either.
-Pretty!
+(Some of this tutorial is based of Professor Steck's book "Analog and Digital Electronics")