by Ciro Santilli (@cirosantilli, 34)
Operated by a hand crank.
Figure 1. Source.
Figure 1. Source.
Figure 2. Source.
Figure 1. Source.
Figure 2. Source.
This notation is designed to be relatively easy to write. This is achieved by not drawing ultra complex ASCII art boxes of every component. It would be slightly more readable if we did that, but prioritizing the writer here.
Two wires are only joined if + is given. E.g. the following two wires are not joined: 
  |
--|--
  |
but the following are: 
  |
--+--
  |
Simple symmetric components:
  • -, + and |: wire
  • AC: AC source. Parameters:
    • Hz: frequency
    • V: peak voltage
    e.g.: 
    AC_1Hz_2V
    If only one side is given, the other is assumed to be at a ground G.
  • C: capacitor
  • G: ground. Often used together with DC, e.g.: 
    DC_10---R_10---G
    means applying a voltage of 10 V across a 10 Ohm resistor, which would lead to a current of 1 A
  • L: inductor
  • MICROPHONE. As a multi-letter symmetric component, you can connect the two wires anywhere, e.g. 
    ---MICROPHONE---
    or: 
    |
MICROPHONE
    |
  • SPEAKER
  • R: resistor
  • SQUID: SQUID device
  • X: Josephson junction
Asymmetric components have multiple letters indicating different ports. The capital letter indicates the device, and lower case letters the ports. The wires then go into the ports:
  • D: diode
    • a: anode (where electrons can come in from)
    • c: cathode
    Sample usage in a circuit: 
    --aDc--
    Can also be used vertically like aany other circuit: 
    |
a
D
c
|
    We can also change the port order, the device is still the same due to capital D: 
    --cDa--

 |
Dac--

 |
Dca--

   |
--caD
  • DC DC source. Ports:
    • p: positive
    • n: negative
    E.g. a 10 V source with a 10 Ohm resistor would be: 
    +---pDC_10_n---+
|              |
+----R_10------+
    If only one side is given, the other is assumed to be at a the ground G. We can also omit p and m in that case and assume that p is the one used, e.g. the above would be equivalent to: 
    DC_10---R_10---G
    If the voltage is not given, it is assumed to be a potentiometer.
  • T: transistor. The ports are sgTd:
    • s: source
    • g: gate
    • d: gate
    Sample usage in a circuit: 
    ---+
   |
--sgTd--
    All the following are also equivalent: 
       |
   g
--sTd--

    |
--Tsgd--
   |
  • I: electric current source. Ports:
    • s: electron source
    • d: electron destination
  • V: Voltmeter. Ports:
    • p: positive
    • n: negative
    If we don't need to specify explicit positive and negative sides, we can just use: 
    ---V---
    without any ports. This is notably often the case for AC circuits.
    Optionaly, we can also add the sides as in:
Numbers characterizing components are put just next to each component with an underscore. When there is only one parameter, standard units are assumed, e.g.: 
+-----+
|     |
C_1p  R_2k
|     |
+-----+
means:
  • a capacitor with 1 pico Faraday
  • a resistor with 2 k Ohms
Micro is denoted as u.
Wires can just freely come in and out of specs of a component, they are then just connected to the component, e.g.: 
DC_10---R_10---G
means applying a voltage of 10 V across a 10 Ohm resistor, which would lead to a current of 1 A
If a component has more than two parameters, units are used to distinguish them when possible, e.g.: 
AC_1kV_2MHz
means an AC source with:
Video 1.
Open Circuits book interview by CuriousMarc (2022)
Source.

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One more more electrical wires surrounded by an insulator.
Video 1. Source. Cat 5e cable stripped

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Main implementations: the same as electronic switches: vacuum tubes in the past, and transistors in the second half of the 20th century.
Video 1.
How to make an LM386 audio amplifier circuit by Afrotechmods (2017)
Source. Builds the circuit on a breadboard from minimal components, including one discrete transistor. Then plays music from phone through headset cables into a speaker.
The fundamental intuition about capacitors is that they never let electrons through.
They can only absorb electrons up to a certain point, but then the pushback becomes too strong, and current stops.
Therefore, they cannot conduct direct current long term.
For alternating current however, things are different, because in alternating current, electrons are just jiggling back and forward a little bit around a center point. So you can send alternating current power across a capacitor.
The key equation that relates Voltage to electric current in the capacitor is:
(1)
So if a voltage Heavyside step function is applied what happens is:
  • the capacitor fills up instantly with an infinite current
  • the current then stops instantly
More realistically, one may consider the behavior or the series RC circuit to see what happens without infinities when a capacitor is involved as in the step response of the series RC circuit.
Figure 1.
Electronic symbol of a capacitor
. Source.
Video 1.
Finding capacitance with an oscilloscope by Jacob Watts (2020)
Source. Good experiment.
Video 2.
Capacitors Explained by The Engineering Mindset
. Source. 2019.
Pieter van Musschenbroek is the perfect example that if your surname is too complicated, things you invent will not be named after you!
Figure 1. Source.
Figure 1. Source.
This is what happens when you apply a step voltage to a series RC circuit: TODO graph.
Ideally can be thought of as a one-way ticket gate that only lets electrons go in one direction with zero resistance! Real devices do have imperfections however, so there is some resistance.
First they were made out of vacuum tubes, but later semiconductor diodes were invented and became much more widespread.
Figure 1.
I-V curve of a diode
. Source. This image shows well how the diode is only an approximation of the ideal one way device. Notably, there is this non-ideal voltage drop across the device, which can be modelled as constant. It is however an exponential in fact.
Video 1.
Diodes Explained by The Engineering Mindset (2020)
Source. Good video:
The first diodes. These were apparently incredibly unreliable, especially for portable radios, as you had to randomly search for the best contact point you could find in a random polycrystalline material!!
And also quality was highly dependant on where the material was sourced from as that affected the impurities present in the material. Later this was understood to be an issue of doping.
It was so unreliable that vacuum tube diodes overtook them in many applications, even though crystal detectors are actually semiconductor diodes, which eventually won over!
For a long time, before artificial semiconductors kicked in, people just didn't know the underlying physical working principle of these detectors. What I cannot create, I do not understand basically.
This was the first generation of commercially successful radios.
It uses a crystal detector as its diode, which is a crucial element of the radio, thus its name.
They were superseded by transistor radios, which were much more reliable, portable and could amplify the signal received.
Figure 1. Source.
Video 1.
How a Crystal radio Works by RimstarOrg
. Source.
GPIO generally only supports discrete outputs.
But for some types of hardware, like LEDs and some motors, the system has some inertia, and if you switch on and off fast enough, you get a result similar to having an intermediate voltage.
So with pulse width modulation we can fake analog output from digital output in a good enough manner.
Notably used to connect:
You can buy large sets of them in combitation of male/male, male/female, female/female. Male/male is perhaps the most important
Video 1.
Making Jumper Wires by PCBurn! (2018)
Source.
These often come pre-soldered on devboards, e.g. and allow for easy access to GPIO pins. E.g. they're present on the Raspberry Pi 2.
Why would someone ever sell a devboard without them pre-soldered!
Figure 1.
6x1 pin header
. Source.
Figure 2.
Underside of a Raspberry Pi 2
. Source. At the top of this image we can clearly see how the usually pre-soldered pin header connectors go through the PCB and are soldered on both sides.
Allows you to connect two adjacent pins of a pin header. Sometimes used as a hardware configuration interface!
Figure 1. Source.
Something where DC voltage comes in, and a periodic voltage comes out.
Video 1.
Oscillators: RC, LC, Crystal by GreatScott! (2015)
Source. Good video. Contains actual breadboard experiments on oscilloscope and circuit diagrams
Oscillator made of an LC circuit.
Video 1.
From Raw Crystal to Crystal oscillator
. Source. by United States Army Signal Corps (1943)
Video 1.
How LEDs work by VirtualBrain
. Source. 2021. Good 3d schematics clearly explaining part of the LED electronic package.
Video 1.
How are LED Chips and LED Encapsulation is made by Future Linear
. Source. Starts from some level of cut square chips. Still in round wafer form.
www.reddit.com/r/Optics/comments/18f6bdt/comment/kcsiook/ mentions:
LEDs are broadband by nature, since the spontaneous emission broadly speaking reflects the overlap of the Fermi distribution and the density of states
Direct and indirect band gaps is an important part of why diodes don't emit light apparently.
Apparently fundamentally LEDs in principle work as photodetectors, but

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Figure 1.
Hand drawn schematic of the magnetic field induced in a magnetic core by an electromagnetic coil
. Source.
Although transistors were revolutionary, it is fun to note that they were just "way cheaper and more reliable and smaller" versions of exactly the main functions that a vacuum tube could achieve
The first working one in 1947 by John Bardeen and walter Brattain in Bell Labs Murray Hill.
People had already patented a lot of stuff before without being able to make them work. Nonsense.
As the name suggests, this is not very sturdy, and was quickly replaced by bipolar junction transistor.
As of 2020, not used anymore in logic gates, but still used in amplifiers.
Figure 1. Source.
Figure 1. Source.
Figure 1. Source.
Video 1.
A Perfect Electronics Bench? by Keysight (2021)
Source.
Video 1.
FNIRSI 1014D review by Kerry Wong (2022)
Source. One of the cheapest oscilloscopes available at the time.
Video 1.
DIY Oscilloscope Kit (20$) VS Regular DS Oscilloscope (400$) by Great Scott (2016)
Source.
Video 2.
Hantek 6022BE Review by Adrian's Digital Basement (2022)
Source.
By Andy Haas, an experimental particle physics professor: as.nyu.edu/content/nyu-as/as/faculty/andy-haas.html What an awesome dude!
Video 1.
Haasoscope prototype, 2 4-channel boards
. Source.
899 USD as of 2022, takes a year to ship as they gather up a lot of orders before producing.
Sounds so cool, especially the multi functionality. Shame so expensive.
Video 1.
ThunderScope presentation for Hackaday Prize (2021)
Source.

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They do seem to have been very innovative, and have had a very good work culture. They also had a huge impact on the Silicon Valley startup scene.
Some products they are known for:
Video 1.
The decline of HP by Company Man (2022)
Source.
Video 2.
HP Origins promotional documentary by HP (2006)
Source. A bit too star eyed, but gives some good ideas.

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In a way, Agilent represents the most grassroots electronics parts of HP from before they became overly invested in laptops and fell.
They spun out the electronics part as Keysight in 2014, becoming life science only.

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