After years of being a software developer, [Chris] was excited to get back into embedded development and we’re glad he did. His 3D printed lithographic moon lamp combines a number …read more (https://hackaday.com/2021/12/08/3d-printed-lithographic-moon-lamp/)

An Easy Music Visualizer With the Arduino Nano
https://hackaday.com/2021/12/08/an-easy-music-visualizer-with-the-arduino-nano/

Flashing LEDs are all well and good, but they’re even better if they can sync up with ambient sounds or music. [mircemk] has built the LUMAZOID visualizer to do just …read more (https://hackaday.com/2021/12/08/an-easy-music-visualizer-with-the-arduino-nano/)

[Getting Rid Of] The Ghost In the LED
https://hackaday.com/2021/12/08/getting-rid-of-the-ghost-in-the-led/

Multiplexing is a very old technology in which control signals are intermixed for the sake of being able to control more devices than there are control signals. For [mihai.cuciuc], the …read more (https://hackaday.com/2021/12/08/getting-rid-of-the-ghost-in-the-led/)

Almost-Modern TeleType is Silent
https://hackaday.com/2021/12/08/almost-modern-teletype-is-silent/

If you’ve ever used a real TeleType machine or seen a movie with a newsroom, you know that one TeleType makes a lot of noise and several make even more.[CuriousMarc] …read more (https://hackaday.com/2021/12/08/almost-modern-teletype-is-silent/)

MAC TIP Diagnoses Your Old Zip and Jaz Drives
https://hackaday.com/2021/12/08/mac-tip-diagnoses-your-old-zip-and-jaz-drives/

Trouble In Paradise (TIP) was a popular Windows-only tool for troubleshooting  Iomega Jaz and Zip drives way back when. The drives have fallen out of favor with PC, but the …read more (https://hackaday.com/2021/12/08/mac-tip-diagnoses-your-old-zip-and-jaz-drives/)

Ham Radio SSB Transceiver Fits in Pocket
https://hackaday.com/2021/12/09/ham-radio-ssb-transceiver-fits-in-pocket/

Talking about this Chinese ham radio transceiver requires a veritable flurry of acronyms: HF, SSB, QRP, and SDR to start with. [Paul] does a nice job of unboxing the rig …read more (https://hackaday.com/2021/12/09/ham-radio-ssb-transceiver-fits-in-pocket/)

Molding Complex Optics in a Completely Fluid System
https://hackaday.com/2021/12/09/molding-complex-optics-in-a-completely-fluid-system/

Traditional lensmaking is a grind — literally. One starts with a piece of glass, rubs it against an abrasive surface to wear away the excess bits, and eventually gets it …read more (https://hackaday.com/2021/12/09/molding-complex-optics-in-a-completely-fluid-system/)