PVC Pipe Turned DIY Digital Telescope
https://hackaday.com/2026/08/21/pvc-pipe-turned-diy-digital-telescope/

[Makestreme] had always wanted to own a nice telescope, but found that budget would not stretch to anything above a cheap model with a limited 50 mm aperture. Wanting a …read more (https://hackaday.com/2026/08/21/pvc-pipe-turned-diy-digital-telescope/)

Thermoacoustic Sterling Engine is Now Fully 3D Printable
https://hackaday.com/2026/08/21/thermoacoustic-sterling-engine-is-now-fully-3d-printable/

Would you like to make your own energy? Why, who doesn’t in this era of rising costs! A sterling engine always looks like a good fit for that: highly efficient, …read more (https://hackaday.com/2026/08/21/thermoacoustic-sterling-engine-is-now-fully-3d-printable/)

Building a Hammond Organ to Understand How They Work
https://hackaday.com/2026/08/21/building-a-hammond-organ-to-understand-how-they-work/

The Hammond organ is an early form of electronic– or perhaps electromechanical– musical instrument. It solved the very real problem of organs normally being the sort of thing you built …read more (https://hackaday.com/2026/08/21/building-a-hammond-organ-to-understand-how-they-work/)

How the Grid’s Harmonic Filters Keep the Power Clean
https://hackaday.com/2026/08/21/how-the-grids-harmonic-filters-keep-the-power-clean/

A fun way to think about a national electrical grid is as a massively upscaled electrical circuit, one in which you have multiple power supplies injecting AC power, with various …read more (https://hackaday.com/2026/08/21/how-the-grids-harmonic-filters-keep-the-power-clean/)