Ciro Santilli @cirosantilli 35

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Euclidean algorithm by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Internationalism by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Multidimensional Fourier transform by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

Lecture notes:

www.robots.ox.ac.uk/~az/lectures/ia/lect2.pdf Lecture 2: 2D Fourier transforms and applications by A. Zisserman (2014)

How the 2D FFT works by Mike X Cohen (2017)

Source. Animations showing how the 2D Fourier transform looks like for simple inpuf functions.

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Football variant by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Universal quantification by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Paper by Erwin Schrödinger by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

web.archive.org/web/20191029234511/https://www.zbp.univie.ac.at/schrodinger/ebibliographie/publications.htm

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English slang by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

www.youtube.com/c/MarcoReps

This mostly faceless German dude is awesome!

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Crystal oscillator by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

First watch: Video "Oscillators: RC, LC, Crystal by GreatScott! (2015)"

From Raw Crystal to Crystal oscillator

. Source. by United States Army Signal Corps (1943)

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Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

Notably used to connect:

pin headers
breadboard holes

You can buy large sets of them in combitation of male/male, male/female, female/female. Male/male is perhaps the most important

Making Jumper Wires by PCBurn! (2018)

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Available battery voltages by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

Only certain battery voltages exist, because this voltage depends intrinsically on the battery's chemical composition.

learn.sparkfun.com/tutorials/battery-technologies/all (CC BY-SA) has a very good summary list, reordered from lowest to highest voltage:

Battery Shape	Chemistry	Nominal Voltage	Rechargeable?
AA, AAA, C, D (Rechargeable)	NiMH or NiCd	1.2V	Yes
AA, AAA, C, and D	Alkaline or Zinc-carbon	1.5V	No
Coin Cell	Lithium	3V	No
Silver Flat Pack	Lithium Polymer (LiPo)	3.7V	Yes
9V	Alkaline or Zinc-carbon	9V	No
Car Battery	Six-cell lead acid	12.6V	Yes

Bibliography:

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Characteristic polynomial by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Spectral theorem by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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E-book viewer by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Direct current source by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Analog-to-digital converter by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

Many/most microcontroller boards have analog-to-digital converters built into them, it is very convenient. E.g. it is the case for the Raspberry Pi Pico.

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Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Orange Papers by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

See: cirosantilli.com/china-dictatorship/orange-papers

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Cryptocurrency mining by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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Non-fungible token by

Ciro Santilli 35  Updated 2025-04-24  +Created 1970-01-01

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