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Questions tagged [etching]

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0
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1answer
32 views

How do we extract the etchant after it is stopped at the boron layer in MEMs fabrication process?

Dopant-Selective etch stop method is where we create a layer of highly doped boron in the substrate to stop the etching process at that exact layer, but when that cavity is created the etchants are ...
12
votes
2answers
357 views

How to rinse container used for ferric chloride etching?

From what I have gathered online, after etching one stores the "used" ferric chloride (more specifically FeCl2 and CuCl) in some container which can then be taken to a waste disposal facility. What ...
2
votes
2answers
82 views

Bubble etching versus rocker tank

I make my own PCBs and etch them in a homemade bubble tank. The tank has failed after a couple of years largely due to the etchant slowly eating it's way through some of the materials (glues, pipes, ...
10
votes
4answers
2k views

My PCBs etch all bad! (sodium persulfate)

I've recently started having problems with etching my PCBs. I use a permanent marker to do the traces and etch them in a stainless steel cup, heated with a tea light (small candle.) The PCBs come ...
0
votes
1answer
163 views

“etching” transparent conductor on transparent plastic film or glass? [closed]

I've put the word etching in quotations as the method to get conductive tracks on a glass or plastic film might not involve a subtractive approach as with traditional PCBs of applying a conductive ...
1
vote
1answer
192 views

Printing PCB layout on TES 200 paper

As title says, I'm trying to print a very dense PCB layout on a thermal paper. I'm using a laser printer, as it is mandatory. The problem is, you can see some little grains/gaps all over the printed ...
0
votes
2answers
118 views

Which of these diagrams should be in the copper side of pcb?

I'm trying a DIY PCB using toner transfer method then etching but I am confused with the diagram below. I thought the top trace goes to the copper board but there's this bottom trace which shows ...
2
votes
1answer
129 views

Does fast one-day prototype manufacturing exist (with components, etching and pick and place under one roof)? What is the fastest possible? [closed]

We have different prototyping assembly houses, but cycle times are so long that engineers need to work on 2-5 projects in parallel. The typical prototype assembly process is: one day order process, ...
0
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1answer
310 views

Can a Laser Engraver be used to develop PCB with photoresist?

I'm building a simple laser engraver/cutter following these instructions: http://www.thingiverse.com/thing:1780556 Now my question is: can I use the laser light on the PCB photoresist instead of "...
0
votes
0answers
37 views

How can I control the current of this electrolytic etcher

I'm trying to build an electrolytic etcher to mark metal parts. I have a 12v DC 5 amp power supply which delivers current to a metal part by connected the negative terminal to the part and the ...
0
votes
2answers
86 views

How to measure current on an electrolytic etcher

I'm building a simple electrolytic etcher to mark steel parts. The set up is a 12v DC 5 amp power supply with the ground connected to on side of the steel part and the positive connected to a brass ...
1
vote
1answer
479 views

Etching using Sodium Persulfate, Is my photosensitive board too old?

I am trying to etch my first PCB ever, I have used the inkjet transparency method to expose my photosensitive Bungard board and developed it using Sodium Peroxide. This part of the process seems to ...
1
vote
2answers
878 views

PCB Etching (Negative Photoresist) Issue

I seem to be having issues getting my new PCB etching setup to work. My earlier setup worked just fine which included: printing negative artwork on a parchment paper exposing a copper pcb with ...
3
votes
2answers
177 views

signs of complete PCB photo-resist development

Currently. I'm making a PCB using the photolithographic method (print on transparency, expose with UV which works, then develop under a bright red LED as the only light source), but half the time, the ...
0
votes
3answers
152 views

“Reverse etch” PCB base(not the copper)

Is there a reliable way to etch a PCB(from working product) so as to be left with the surface without the substrate? Sometimes an existing PCB product which wasn't designed with weight, size or ...
1
vote
2answers
1k views

How to remove Kapton polyimide film from Pyralux cupper sheet?

I want to etch Pyralux sheet and will follow this tutorial. The sheet I want to try is LF9120R and it is 1 oz of copper per square ft (or 305g/m^2). They describe ...
2
votes
1answer
425 views

PCB UV Etching Paint

Is the UV curable paint used for PCB etching the same UV curable paint used for making PCB solder masks? Some have different eBay descriptions but they're all in identical 100g black containers. As ...
1
vote
1answer
385 views

Can Petroleum Jelly be used as a PCB resist?

I've been experimenting with various setups for PCB etching, and thought I'd share one of the more useful things I'd found, as I don't see much information about the subject anywhere else. I've been ...
5
votes
2answers
1k views

What is the typical PCB fabrication process in a professional PCB house?

I have been etching my own boards as part of my hobby interest into electronics, and I can't help but wonder how exactly is the typical printed circuit board manufactured? Unfortunately, details on ...
2
votes
1answer
2k views

Proper storage of ferric cloride PCB etchant

I etch about half a dozen printed circuit boards each year at home, using an aqueous ferric chloride AKA iron(III) chloride etchant solution. As I want to minimize the costs and hassle of buying new ...
3
votes
1answer
411 views

Apply etch resist on copper

I cannot get my toner etch resist on to my copper board. I'm doing with the iron, but each time I try the ink does not transfer completely. I've tried many things - applying some water on it, ...
1
vote
2answers
1k views

How to etch Double sided pcb?

I am trying to etch my circuit on a double sided copper clad at home. After designing my circuit I took a print on tracing paper and used iron to get the trace on copper clad. When I used iron paper ...
1
vote
1answer
127 views

How do I make a through-hole via? [duplicate]

Using a simple PCB with copper on both sides but naturally in between, is it feasible for a hobbyist to make through-hole vias like this: It seems there is copper in the via itself, isn't there? If ...
-1
votes
1answer
380 views

Current limiting AC

I am currently experimenting with electrolytic marking. I use a DC bench supply with a current dial so I can drive the reaction with a constant current to keep the marking steady and as a plus keep it ...
0
votes
1answer
1k views

What is the recommended exposure time for presentisized positive photoresist board? [duplicate]

What is the recommended exposure time for presentisized positive photoresist board using UV light, fluorescent light, CFL bulb and (will it also work with LED light)? How do we also determine if the ...
-1
votes
1answer
302 views

pcb etching: chemical method or milling [closed]

i'am actually intending to install a small pcb production process (100 pieces per day) and i am still hesitating on the etching method: chemical or with a milling machine !! I would prefer a cnc ...
1
vote
0answers
47 views

crystalline structure of single crystal wafers used for MEMS fabrication

When they say that we have a {1 0 0} single crystal wafer, I know that the surface normal to the wafer is oriented in the <1 0 0> family direction, but if I draw a line on the wafer, parallel to my ...
0
votes
2answers
59 views

Silicon etching process

I am a student doing my Master's Degree having a background in Electrical Engineering. I have studied on my own millers indices, crystallographic planes and directions so to be able to understand the ...
4
votes
3answers
2k views

Does ferric chloride etchant “go bad” after some period of time?

I have some old circuit board etching solution (ferric chloride) that is unused but a few years old and has not been in a temperature controlled environment. It has been sitting, all but forgotten, ...
4
votes
1answer
800 views

PCB etching troubles. Over etched?

I'm trying out making PCBs for the first and I'm using the UV photo resist method. It seems to me I have the exposure and developing working very well but I'm having some issues with etching. I'm ...
3
votes
1answer
1k views

Determining the best UV exposure time

I would like to manufacture DIY PCB. I am planning to make a UV box like on this link, then I wonder how I can determine the best UV exposure time? or if I use the Sun as the UV source, how I can ...
4
votes
2answers
901 views

How to etch finely-packed SMD boards?

I have tested HCl+peroxide etching with the light/transparent for SMD but it is very easy to get lines broken -- even though I had blue liquid and a proper etching equipment that I could monitor. I am ...
4
votes
1answer
2k views

Disposal of the used acid/hydrogen peroxide etchant?

This thread repeated the question how to dispose the used acid/hydgogen peroxide etchant. So how can I dispose acid/hydrogen peroxide etchant? Perhaps interesting thread to other readers, Disposal of ...
9
votes
5answers
13k views

Disposal of ferric chloride etchant

I've just got hold of a nice little PCB etching kit, which uses ferric chloride as the etchant. I know it's re-usable for at least a few etches (though the kit doesn't actually specify an estimated re-...
13
votes
3answers
7k views

PCB test patterns to assess etch quality

Does anyone know of a good test sheet for assessing the quality of home etching? Rather than create something and reinvent the wheel, I'm looking for a PDF/PS file featuring tracks of different ...
3
votes
5answers
2k views

What's Special about Resist Pens?

Just what is special about the resist pens used to draw directly on PCBs before etching? Would a permanent marker work as well, or some other kind pen or marker? Naturally I have in mind something ...
12
votes
9answers
21k views

Ferric Chloride or Muriatic Acid + Hydrogen Peroxide for etching?

Currently purchasing the required kit to start etching my own boards and have gotten to the etching solution stage. Ferric Chloride seems to be the standard for etching but I have also read about ...
12
votes
6answers
7k views

PCB prototyping with Presensitized copper boards

I'm currently working on my first PCB prototyping by using some pre-sensitized PCB board, purchased from Maplins UK. However, I'm having terrible trouble exposing and developing the board, it just ...