Five Oddest Op Amp Applications
https://hackaday.com/2025/05/06/five-oddest-op-amp-applications/

You think of op amps as amplifiers because, no kidding, it is right in the name. But just like some people say, “you could do that with a 555,” [Doctor …read more (https://hackaday.com/2025/05/06/five-oddest-op-amp-applications/)

DIY Penicillin
https://hackaday.com/2025/05/06/diy-penicillin/

We don’t often consider using do-it-yourself projects as a hedge against the apocalypse. But [The Thought Emporium] thinks we should know how to make penicillin just in case. We aren’t …read more (https://hackaday.com/2025/05/06/diy-penicillin/)

Adorable Robot Steals the Show
https://hackaday.com/2025/05/06/adorable-robot-steals-the-show/

An ongoing refrain with modern movies is “Why is all of this CG?”– sometimes, it seems like practical effects are simultaneously a dying art, while at the same time modern …read more (https://hackaday.com/2025/05/06/adorable-robot-steals-the-show/)

Tracking the Sun? Nah!
https://hackaday.com/2025/05/07/tracking-the-sun-nah/

If you want solar power, you usually have to make a choice. You can put a solar panel in a fixed location and accept that it will only put out …read more (https://hackaday.com/2025/05/07/tracking-the-sun-nah/)

Magic On Your Desk via MagLev Toy
https://hackaday.com/2025/05/07/magic-on-your-desk-via-maglev-toy/

Magnets aren’t magic, but sometimes you can do things with them to fool the uninitiated — like levitating. [Jonathan Lock] does that with his new maglev desk toy, that looks …read more (https://hackaday.com/2025/05/07/magic-on-your-desk-via-maglev-toy/)

Big Chemistry: Cement and Concrete
https://hackaday.com/2025/05/07/big-chemistry-cement-and-concrete/

Not too long ago, I was searching for ideas for the next installment of the “Big Chemistry” series when I found an article that discussed the world’s most-produced chemicals. It …read more (https://hackaday.com/2025/05/07/big-chemistry-cement-and-concrete/)

Germany’s Cabinentaxi: The Double-Sided Monorail That Wasn’t Meant To Be
https://hackaday.com/2025/05/07/germanys-cabinentaxi-the-double-sided-monorail-that-wasnt-meant-to-be/

https://www.youtube.com/watch?v=vca3EF4C5xU
" data-image-caption="Cabinentaxi layout as it existed in 1978, with labels by the Tim Traveller YT channel.
" data-medium-file="https://hackaday.com/wp-content/uploads/2025/05/cabinentaxi_1978_rvr_with_tim_traveller_labels.jpg?w=400" data-large-file="https://hackaday.com/wp-content/uploads/2025/05/cabinentaxi_1978_rvr_with_tim_traveller_labels.jpg?w=800">The 1970s was a perfect time for alternative modes of transport to be trialed that might replace cars in the wake of the global oil crisis. One of these was …read more (https://hackaday.com/2025/05/07/germanys-cabinentaxi-the-double-sided-monorail-that-wasnt-meant-to-be/)