[FRAN’S] PCB ETCHING techniques

We think that anyone who’s done at-home PCB fabrication will appreciate the tidiness that [Fran] maintains throughout her etching process. She recently posted a three-part video tutorial which showcases her techniques. As you can see in the screenshot above, her routines reek of superior laboratory skills. Regular readers can probably guess what circuit she’s etching. It’s the …

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DIY SPECTROPHOTOMETER

[Charlie] has been making a diy Spectrophotometer, as well as while it is a “shambling mess of information-age technology!” it is still much much better than ours. Focused around an arduino, bits of lego, as well as a flashlight, this innovative gadget rotates a diffraction grating (flake of compact disc) aimed at a picture resistor. …

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