Disposable Vape Batteries Turned USB Power Bank
https://hackaday.com/2023/12/14/disposable-vape-batteries-turned-usb-power-bank/

It’s another one of those fun quirks about our increasingly cyberpunk world — instead of cigarette butts littering our streets, you’re more likely to find disposable vaporizers that have run …read more (https://hackaday.com/2023/12/14/disposable-vape-batteries-turned-usb-power-bank/)

Quick Negative Voltage for an Op Amp
https://hackaday.com/2023/12/14/quick-negative-voltage-for-an-op-amp/

It is a classic problem when designing with op amps: you need the output to go to zero, but — for most op amps — you can’t quite get down …read more (https://hackaday.com/2023/12/14/quick-negative-voltage-for-an-op-amp/)

Sneakernet Power Transmission
https://hackaday.com/2023/12/14/sneakernet-power-transmission/

Power outages in the face of natural disasters or more mundane grid failures can range from a mild inconvenience to a matter of life or death if you depend on …read more (https://hackaday.com/2023/12/14/sneakernet-power-transmission/)

Charging While Driving Now Possible in Michigan
https://hackaday.com/2023/12/14/charging-while-driving-now-possible-in-michigan/

Heavy vehicles like semi trucks pose a bigger challenge in electrifying the transportation fleet than smaller, more aerodynamic passenger cars. Michigan now has the first public in-road charging system in …read more (https://hackaday.com/2023/12/14/charging-while-driving-now-possible-in-michigan/)

Laser Cut Zither Instrument Kicks It Old World Style
https://hackaday.com/2023/12/14/laser-cut-zither-instrument-kicks-it-old-world-style/

Man playing custom zither made with a laser cutter.
" data-image-caption="" data-medium-file="https://hackaday.com/wp-content/uploads/2023/12/LaserCutZither-Header.jpg?w=400" data-large-file="https://hackaday.com/wp-content/uploads/2023/12/LaserCutZither-Header.jpg?w=800">Learning to play an instrument takes a certain level of dedication — and you can add another layer of dedication on top of that when it’s an instrument not found …read more (https://hackaday.com/2023/12/14/laser-cut-zither-instrument-kicks-it-old-world-style/)

It’s a Microphone and a Spring Reverb all in One
https://hackaday.com/2023/12/15/its-a-microphone-and-a-spring-reverb-all-in-one/

We’re so used to reverb effects being simply another software plugin that it’s easy to forget the electromechanical roots of the effect. Decades ago, a reverb would have been a …read more (https://hackaday.com/2023/12/15/its-a-microphone-and-a-spring-reverb-all-in-one/)

Building a Solar-Powered, Supercapacitor-Based Speaker
https://hackaday.com/2023/12/15/building-a-solar-powered-supercapacitor-based-speaker/