Head over to github.com/maia-sdr/plu... to download the firmware and to github.com/maia-sdr/mai... for updated information about connecting to an Android phone.

When setup timing is violated, typically the output delay becomes much larger than the nominal one, increasingly more as the data transition approaches the clock edge. This goes somewhat against the usual idea that setup violations mainly cause metastability.

Read more: destevez.net/2025/09/flip...

Using ngspice, the timing properties of the flip-flop can be measured. Here is an output delay simulation, where the output for different process corners is shown in different colours.

Everything is working fine, except that with sawtooth ramps the overshoot is too large (~100 MHz), which could be fixed by a loop filter redesign, and the fast lock mode seems to make the loop unstable (I don't know exactly why this happens).

Read more: destevez.net/2025/09/10-g...

I study the Normalized Burn Ratio that measures burn severity, and three different vegetation indices that measure vegetation density and health. With these I obtain some conclusions about the damage caused by the fire.

Read more: destevez.net/2025/08/mult...

In this post I dive into the 13 spectral bands captured by Sentinel-2 and explain how they can be used to measure vegetation health and fire affectance. This image shows SWIR in red, highlighting burnt areas, NIR in green, highlighting vegetation, and visible green in blue.

There is now Sentinel-2 imagery for today that has no clouds and has data products that can be downloaded for free. This shows a comparison between 2025-08-10 and 2025-08-13.

Which was the company? (If you can and want to say) Probably I know it.

The above image was supposed to be an animated GIF comparing before and after the fire, but it looks like that doesn't work on Bluesky. Here are the two images.

There is more information about this in my blog post destevez.net/2025/08/tres...

URE sells a book which is specific for the exam in Spain tienda.ure.es/libros/39-li... FEDI-EA has exam models www.fediea.org/examen/exerc...

The datasets are available in Zenodo, and I will do detailed analysis in the future.

Read more: destevez.net/2025/07/n78-...