Welcome to Electrical Engineering Stack Exchange

Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It's built and run by you as part of the Stack Exchange network of Q&A sites. With your help, we're working together to build a library of detailed answers to every question about electronics design.

We're a little bit different from other sites. Here's how:


Ask questions, get answers, no distractions

This site is all about getting answers. It's not a discussion forum. There's no chit-chat.

Just questions...

...and answers.

up vote

Good answers are voted up and rise to the top.

The best answers show up first so that they are always easy to find.

accept

The person who asked can mark one answer as "accepted".

Accepting doesn't mean it's the best answer, it just means that it worked for the person who asked.

How to remove solder mask?

up vote 14 down vote favorite

I'd like to reuse a PCB in non-intended way and I have to remove the green solder mask to expose the copper traces in 1 x 3 cm area. Is there any safe method to do it without damaging the traces?

I've tried acetone first, then a bunch of other household chemicals, but it is resistant.

2 Answers

up vote 4 down vote accept

Google "fiberglass brush pencil", once you try that you won't want anything else.

up vote 3 down vote

Usually a little wet/dry abrasive paper does the trick, use it dry first then damp it a little.

You may get the same results with fine sandpaper, but I think wet/dry is better as it has a finer grain, which is less likely to damage copper traces (especially thin or shallow ones).

That's how I did it when I got a faulty batch which did not have enough mask clearance.


Get answers to practical, detailed questions

Focus on questions about an actual problem you have faced. Include details about what you have tried and exactly what you are trying to do.

Ask about...

  • a specific electronics design problem
  • the theory and simulation of electromagnetic forces
  • a communication scheme
  • the writing of firmware for bare-metal or RTOS applications

Not all questions work well in our format. Avoid questions that are primarily opinion-based, or that are likely to generate discussion rather than answers.

Questions that need improvement may be closed until someone fixes them.

Don't ask about...

  • Shopping or buying recommendations
  • Consumer electronics such as media players, cell phones or smart phones, except when designing these products or modifying their electronics for other uses
  • Programming software for a PC
  • Anything else not directly related to electronics design
  • Questions that are primarily opinion-based
  • Questions with too many possible answers or that would require an extremely long answer

Tags make it easy to find interesting questions

All questions are tagged with their subject areas. Each can have up to 5 tags, since a question might be related to several subjects.

Click any tag to see a list of questions with that tag, or go to the tag list to browse for topics that interest you.

How to remove solder mask?

up vote 14 down vote

I'd like to reuse a PCB in non-intended way and I have to remove the green solder mask to expose the copper traces in 1 x 3 cm area. Is there any safe method to do it without damaging the traces?

I've tried acetone first, then a bunch of other household chemicals, but it is resistant.


You earn reputation when people vote on your posts

Your reputation score goes up when others vote up your questions, answers and edits.

+5 question voted up
+10 answer voted up
+15 answer is accepted
+2 edit approved

As you earn reputation, you'll unlock new privileges like the ability to vote, comment, and even edit other people's posts.

Reputation Privilege
15 Vote up
50 Leave comments
125 Vote down (costs 1 rep on answers)

At the highest levels, you'll have access to special moderation tools. You'll be able to work alongside our community moderators to keep the site focused and helpful.

2000 Edit other people's posts
3000 Vote to close, reopen, or migrate questions
10000 Access to moderation tools
see all privileges

Improve posts by editing or commenting

Our goal is to have the best answers to every question, so if you see questions or answers that can be improved, you can edit them.

Use edits to fix mistakes, improve formatting, or clarify the meaning of a post.

Use comments to ask for more information or clarify a question or answer.

You can always comment on your own questions and answers. Once you earn 50 reputation, you can comment on anybody's post.

Remember: we're all here to learn, so be friendly and helpful!

up vote 9 down vote

Google "fiberglass brush pencil", once you try that you won't want anything else.

edit

another thing I've never heard of :) Although I've already done my work, I've ordered one to try it out. - csadam Sep 11 '13 at 21:36

add comment


Unlock badges for special achievements

Badges are special achievements you earn for participating on the site. They come in three levels: bronze, silver, and gold.

In fact, you can earn a badge just for reading this page:

 Informed Read the entire about page
 Student Asked first question with score of 1 or more
 Editor First edit
 Good Answer Answer score of 25 or more
 Civic Duty Voted 300 or more times
 Famous Question Asked a question with 10,000 views

see all badges


Find a question to answer, or ask your own

Looking for more in-depth information on the site? Visit the Help Center

Electrical Engineering Stack Exchange is part of the Stack Exchange network

Like this site? Stack Exchange is a network of 118 Q&A sites just like it. Check out the full list of sites.

Stack Exchange