After I posted the menorah yesterday where I said in passing that you’re not supposed to have circuit traces bend at right angles, I got a few questions from readers asking exactly why this is. The explanation is kind of complicated and involves some of Maxwell’s equations as well as multivariable calculus, but I’ll do my best to explain it in a way that doesn’t require any special knowledge of either of these topics. This is going to be a doozy, so read on if you dare.
A Digital Menorah
You know, the Jews got 1 day’s worth of oil to last 8 days. That’s what I call engineering!
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How to Etch a Two Layer PCB with UV-sensitive Copper Clad
The moment you’ve all been waiting for! My super awesome guide on how to make these
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Ice Breaker v1.1
So, a few weeks ago, I made a gadget that I called the “Ice Breaker”. It was a simple persistence of vision toy that would spell out the word “Hello” on your hand as you wave to someone. The original didn’t work too well, so I made a new version that works great! Here’s a video:
Stick around until the end to see what was going on with the old version.
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An Acid
So, after weeks of trying to get this whole PCB etchant business right, I think I’ve finally finally got it.
See?
Using LEDs as Light Detectors (LDDs?)
Whaaat? You can do that?! You need phototransistors or photodiodes silly! Turns out, you don’t. IT’S A CONSPIRACY!
Seriously though, LEDs can be used as photo detectors. It’s not as simple as using a proper photodiode, but it’s a pretty neat trick and can save you a few parts if you’re working on a budget.
The Bullet Counter
So I had a chance to test my bullet counter this weekend!
I met up with two redditors this past Sunday and they let me borrow their guns for testing. I wish I could tell you that all went well, but I had some pretty interesting problems… Continue reading
The Ice Breaker
If you saw this guy at a bar, would you say hello?
No? What if he shaved and took a shower? Continue reading
The Most Beautiful Thing in the World
Failure Across the Board
So, the good news is that my laptop is up and running again despite Apple designing their software to be too user-friendly to actually work (it’s cute when it’s PhotoBooth. Less so when it’s 10,000 of my photos).
The bad news is that my attempts at making a circuit board were complete failures. See results below: