🎓 Doc Freemo 🇳🇱 @freemo@qoto.org

So for those of you following my #ROES project ("Ridiculously Over Engineered SWR Meter") which I've been active on the past few days I finally just sent the boards off to be printed for a prototype run. so V2.0 is officially released (though I may do a minor revision before printing up a large number of boards).

Attached are some screenshots of the final schematic and some renderings of what the boards will look like when its done. Its a 4 layer board though so many of the traces are internal.

You can find the files for this, which will be released as open-source, here:

https://git.qoto.org/roes/roes-hardware/

#Ham #HamRadio #Radio #RF #EE #Electronics #ElectricalEngineering #Science

Which is the funniest of all the vegetables?

5D chess looks sooo cool! I need to learn this.

https://youtu.be/LOotGsWbaeA

#Chess

Reality

Taking the 1920s fountain pen I just fixed, a Waterman 52 out for a test drive. She handles beautifully. Thia is Italian Hand Copperplate script for those curious.

Side this is the best i to to any book every written.

#Calligraphy #Handwriting #Quote #Quotes #Copperplate

A look at a writing sample from a Waterman's 52 fountain pen from the 1920's I just repaired.

Spent 20$ on a Waterman 52 from the 1920s that was non functional, these usually go for 200$. After 5 minutes i replaced the sack and she is good as new.

To my surprise she is even a wet noodle which is the most sought after kind.

#calligraphy #handwriting #Waterman #watermans #antiques #fountainpen #pens #vintagepens

Sweet, I have lost 15.8 lbs in 23 days. Thats about 0.7 lbs per day! This diet is going pretty good so far.

Holy shit, i got out in time!

So I fixed a few more mistakes in the the V2 schematic for my "Ridiculously Over Engineered SWR Meter". Attached is the new schematic.

You can find the files for this, which will be released as open-source, here:

https://git.qoto.org/roes/roes-hardware/

#Ham #HamRadio #Radio #RF #EE #Electronics #ElectricalEngineering #Science #ROES

For those following along I have made some minor corrections to the V2 schematic for my "Ridiculously Over Engineered SWR Meter". Attached is the new schematic.

You can find the files for this, which will be released as open-source, here:

https://git.qoto.org/roes/roes-hardware/

#Ham #HamRadio #Radio #RF #EE #Electronics #ElectricalEngineering #Science #ROES

Some of the physics students I tutor recently asked me to explain the Casimir Effect in simple conceptual terms, so here it is...

The Casimir Effect can be noticed if you take two plates separated by a very small distance in a vacuum; there will be a mysterious force that causes the plates to be attracted to each other.

The cause of this effect is analogous and similar to having two plates in a medium, like water; If you apply sound waves to the water with a wavelength greater than the distance of the separation of the plates you will notice the plates will attract. This is because the waves are too big to enter the space between the plates and as such they exert a force on the outside faces of the plates and none on the inside faces, causing them to attract.

However with the Casimir Effect the plates are in a vacuum, and the waves come from quantum fluctuations rather than traditional mechanical waves. As we know from quantum mechanics everything can be represented as waves. We also know that at very small dimensions we witness a "quantum foam", essentially particles and energy constantly flashing in and out of existence. These particles and energy are essentially the source of the waves in a vacuum. If the plates are sufficiently close then only particles and energy of sufficiently small wavelength will occur between the plates, while larger wavelengths would be free to form in the space outside the plates. As such a similar effect as our water example occurs where there are more waves to exert a force on the outside faces of the plates than on the inside faces. As such the two plates are again attracted to each other.

https://en.wikipedia.org/wiki/File:Water_wave_analogue_of_Casimir_effect.ogv

#Science #Physics #QM #Quantum #QuantumMechanics #wave #Waves