Op Amp Contest: Go Down An Octave, No FFT, No PLL, No Oscillator!
https://hackaday.com/2023/04/24/op-amp-contest-go-down-an-octave-no-fft-no-pll-no-oscillator/

We like a project that makes us think, and that was certainly the case with [MS-BOSS]’s octave downshifter that’s an entry in our current op-amp contest. Instead of resorting to …read more (https://hackaday.com/2023/04/24/op-amp-contest-go-down-an-octave-no-fft-no-pll-no-oscillator/)

Messing With a Cassette Player Never Sounded So Good
https://hackaday.com/2023/04/24/messing-with-a-cassette-player-never-sounded-so-good/

Cassette players and tapes are fertile hacking ground. One reason is that their electromechanical and analog nature provides easy ways to fiddle with their operation. For example, slow down the …read more (https://hackaday.com/2023/04/24/messing-with-a-cassette-player-never-sounded-so-good/)

$60 Robot Arm is Compact
https://hackaday.com/2023/04/24/60-robot-arm-is-compact/

Thanks to 3D printing and inexpensive controllers, a robot arm doesn’t need to break the bank anymore. Case in point? [Build Some Stuff] did a good-looking compact arm with servos …read more (https://hackaday.com/2023/04/24/60-robot-arm-is-compact/)

Testing Part Stiffness? No Need To Re-invent the Bending Rig
https://hackaday.com/2023/04/24/testing-part-stiffness-no-need-to-re-invent-the-bending-rig/

If one is serious about testing the stiffness of materials or parts, there’s nothing quite like doing your own tests. And thanks to [JanTec]’s 3-Point Bending Test rig, there’s no …read more (https://hackaday.com/2023/04/24/testing-part-stiffness-no-need-to-re-invent-the-bending-rig/)

Half Crystal Radio, Half Regenerative Radio
https://hackaday.com/2023/04/24/half-crystal-radio-half-regenerative-radio/

A rite of passage in decades past for the electronics experimenter was the crystal radio. Using very few components and a long wire antenna, such a radio could pick up …read more (https://hackaday.com/2023/04/24/half-crystal-radio-half-regenerative-radio/)

Make Your ESP32 Talk Like It’s the 80s Again
https://hackaday.com/2023/04/25/make-your-esp32-talk-like-its-the-80s-again/

80s-era electronic speech certainly has a certain retro appeal to it, but it can sometimes be a useful data output method since it can be implemented on very little hardware. …read more (https://hackaday.com/2023/04/25/make-your-esp32-talk-like-its-the-80s-again/)

3D Print For Extreme Temperatures (But Only If You’re NASA)
https://hackaday.com/2023/04/25/3d-print-for-extreme-temperatures-but-only-if-youre-nasa/