Design, Build, Test, Iterate

Archive for July, 2011

DIY PCB Etching: Safety Lessons Learned

I wondered for a while about the title of this post, because I have actually learned very little in terms of safety. After all this, I know I’m still not going to use a fume hood, I’m still going to do this in my garage (albeit closer to the door), and I still won’t wear […]

DIY PCB Etching: Not Electrolyzing Salt to Make Cupric Chloride

The tutorials use hydrochloric acid and hydrogen peroxide as the starting etchant not because they aren’t adventurous but because that is what works best (as opposed to using electrolysis). The starting etchant (hydrochloric acid and hydrogen peroxide) Once again, the starting etchant provides chlorine that will oxidize copper to form cupric chloride: Hydrochloric acid is […]

Ceramic Hand

I found the ceramic hand I made in my high school’s ceramics class two years ago. If I recall correctly, it took me about 12 hours to mold by hand. I tried to make it look as if it was fingering chords on a violin, but it got deformed a bit as it dried. Even […]

Using Mailman with multiple domains

This is something that has been bugging me for a while. Our robotics team owns both and I don’t know if this is actually true, but it seems that the .net is the domain we publicize. On the other hand, for some (or no) reason, our mailing list uses the .com domain. This […]

DIY PCB Etching: Collecting Chlorine Gas (Read: DON’T)

tl;dr: There are much more efficient ways in which to produce chlorine gas than by electrolysis, so stop hoping and go buy some hydrochloric acid. I ultimately did not achieve anything practical by producing the gas. This post is only a log. Accidentally oxidizing my cuprous chloride solution Technically, it’s possible to turn a cuprous […]