hw update, move synths

Author: azimut

hardware/analog/components/active/diode.org

@@ -109,12 +109,12 @@
   - 1N1100
   - [[https://en.wikipedia.org/wiki/1N4148_signal_diode][1N4148]] (glass red, switching 4ns, 200mA, 100v)
   - 1N5236B
-- Rectifier: epoxy, high electric current
+- Rectifier: epoxy, high electric current, +voltage drop
   - https://www.inventable.eu/2017/09/04/los-diodos-1n4000/
   - https://en.wikipedia.org/wiki/1N400x_rectifier_diode
   - 1N400x (1A, 30us)
   - 1N54xx (3A)
-- Schottky
+- Schottky, -voltage drop
   - [[https://en.wikipedia.org/wiki/List_of_1N58xx_Schottky_diodes][1N58xx]] (Vf=0.3v,10ns)
 - Zener
   - low breakdown voltage

hardware/analog/components/active/transistors/bjt.org

@@ -7,7 +7,7 @@
 - http://r-luis.xbot.es/edigital/qnpn_pnp.html
 - The most common
 - Uses both *electrons* and *electron holes* as charge carriers.
-- current controlled switch
+- =current= controlled switch
 - _voltage drop_ of 0.5v
 - Multiplies (~100x) current (the Betha)
 - Most transistors operate at: 0mV < Vbe < 700mV

hardware/analog/components/active/transistors/fet.org

@@ -1,4 +1,4 @@
-* FET (Field Effect Transistor)
+#+TITLE: FET (Field Effect Transistor)
 
 [[https://i.ytimg.com/vi/euXR2blqlDE/maxresdefault.jpg]]
 
@@ -8,33 +8,43 @@
 - https://en.wikipedia.org/wiki/Field-effect_transistor
 - 1925/195-
 - aka "unipolar transistors"
-- voltage controlled switch
+- =voltage= controlled switch
+  - low consume
+  - low resistance
+  - high impedance
 - Uses an ~electric field~ to control the flow of current in a semiconductor.
+- easy to damage with static fields
+- supports higher loads than BJT without overheat
+  - by requiring small voltages, NOT CURRENT for it's gate
+  - commonly used with a resistor on it's gate
 - terminals/legs
-  1) source
-  2) gate: control the flow of current by applying voltage here, which alters the conductivity
-  3) drain
+  1) Gate: control the flow of current by applying voltage here, which alters the conductivity
+  2) Drain (into)
+  3) Source (flow out of, aka GND)
 
-**   JFET (Junction FET)
+*   JFET (Junction FET)
 
+- https://en.wikipedia.org/wiki/JFET
 - in ~N-type~ applying negative voltage in gate would increase depletion region
 #+ATTR_ORG: :width 150
 [[https://eepower.com/uploads/articles/Fig1-An-overview-of-the-field-effect-transistor-fet.jpg]]
 
-** MOSFET (Metal-Oxide-Semiconductor FET)
+* MOSFET (Metal-Oxide-Semiconductor FET)
 
-- threshold voltage:
+- https://en.wikipedia.org/wiki/MOSFET
+- threshold/gate voltage:
   - generics 2-4v
   - logic-level ones <2v
-- voltage based switching
-- a block of ~P-type~ with probes of ~N-type~ (in N-type transistors)
-- a metal gate layer above a insulating oxide layer, that controls flow of an electric field
-- when a (+) is given to the gate,
-  it pulls electrons making the whole middle section N-type
-  closing the circuit
-- features
-  - less power
-  - much smaller
-  - easy to damage
+- types
+  - n-channel
+    - more common
+    - a block of ~P-type~ with probes of ~N-type~
+    - when a (+) is given to the gate,
+      it pulls electrons making the whole middle section N-type
+      closing the circuit
+  - p-channel
+    - inverse behaviour
+
+#+CAPTION: a metal gate layer above a insulating oxide layer, controls flow of an electric field
 #+ATTR_ORG: :width 200
 [[https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Lateral_mosfet.svg/800px-Lateral_mosfet.svg.png]]

hardware/analog/components/active/voltage-regulator.org

@@ -14,13 +14,13 @@
 - they have dozens of transistors
 - they have 3 pins
 
-#+CAPTION: unregulated(top) and regulated(bottom) voltage
+#+CAPTION: oscilloscope, unregulated(top) and regulated(bottom) voltage
 #+ATTR_ORG: :width 300
 [[https://europe1.discourse-cdn.com/arduino/optimized/4X/9/b/7/9b71f04d0e8c22b4ff58be5a051a707088b7cdc8_2_669x500.jpeg]]
 
 * Circuit
 
-the datasheet will tell you what capacitors you need for the IN/OUT
+the datasheet will tell you what capacitors you need for the IN & OUT
 #+ATTR_ORG: :width 400
 [[https://www.build-electronic-circuits.com/wp-content/uploads/2023/06/full_rectifier-1.png]]
 
@@ -31,7 +31,7 @@ the datasheet will tell you what capacitors you need for the IN/OUT
 
 - TPS61070 - Efficient Synchronous Boost Converter
 - LM2596 - Step-Down Voltage Regulator
-- LM317 - Adjustable Voltage Regulator
+- LM317 - *Adjustable* Voltage Regulator
   - Can be setup to adjust voltage based on potentiometer
     - Vout = 1.25 * (1+(R2/R1)) + 50u * R2
   - Can be also setup to provide a constant current source (while changing voltage)
@@ -42,6 +42,16 @@ the datasheet will tell you what capacitors you need for the IN/OUT
 - https://en.wikipedia.org/wiki/78xx
 - https://www.inventable.eu/2023/05/17/reguladores-tension-78l/
 
+- Where "xx" indicate the _output_ voltage
 - 78xx - positive (linear) voltage regulators
+  |------+--------+--------|
+  |      |    <r> |    <r> |
+  |      | min in | output |
+  |------+--------+--------|
+  | 7824 |    30v |    24v |
+  | 7812 |    15v |    12v |
+  | 7808 |    10v |     8v |
+  | 7806 |     8v |     6v |
+  | 7805 |     7v |     5v |
+  |------+--------+--------|
 - 79xx - negative (linear) voltage regulators
-- where "xx" indicate the _output_ voltage

hardware/analog/components/passive/capacitors.org

@@ -27,8 +27,8 @@
   - high frequency, acts like short circuit
   - low frequency, acts like open circuit
 - due above can function as
-  - a LPF, useful to clean high freq noise
-  - a HPF
+  - a LPF, useful to clean high freq noise, electrolitic cap
+  - a HPF, ceramic cap
   - a band filter, by using both LPF+HPF
 
 * Form Factors

hardware/analog/courses.org

@@ -1,3 +1,4 @@
+- [[https://www.youtube.com/playlist?list=PLkyBCj4JhHt9dIWsO7GaTU149BkIFbo5y][Electricity videos in order]] by Physics Videos by Eugene Khutoryansky
 - [[https://www.youtube.com/playlist?list=PLah6faXAgguOeMUIxS22ZU4w5nDvCl5gs][Beginner Electronics]] by CodeNMore
 - [[https://www.youtube.com/playlist?list=PL7T06JEc5PF61Ma10WWjYn5YodvXrhWe2][Electronics]] by Nerd's Lesson
 - [[https://www.youtube.com/playlist?list=PLLs0XGQCqp0peSsgkpm8hsWLC5C9hUg8x][Learning Electronics]] by Leo's Bag of Tricks

hardware/analog/videos.org

@@ -1,12 +1,13 @@
 - Transistors: https://www.youtube.com/watch?v=X31B1pVow1o
+
 * channels
 
+- https://www.youtube.com/c/Electr%C3%B3nicaFP/videos
 - https://www.youtube.com/@GadgetReboot
 - IMSAI guy basics https://www.youtube.com/playlist?list=PLXDK0MeyK4Zj7aS1_kkNKaRwiWeBhNZb0
 - https://www.youtube.com/@EngineeringMindset/playlists
 - https://www.youtube.com/@EEVblog/playlists
 - https://www.youtube.com/@jeriellsworth/videos
-- https://www.youtube.com/playlist?list=PLkyBCj4JhHt9dIWsO7GaTU149BkIFbo5y
 - https://www.youtube.com/@greatscottlab/videos
 - https://www.youtube.com/@stemscience1/videos
 - https://www.youtube.com/@Vocademy-Electronics-Tech
@@ -16,7 +17,6 @@
 - https://www.youtube.com/@IMSAIGuy/videos
 - https://www.youtube.com/@HaseebElectronics/videos
 - https://www.youtube.com/c/ShawnHymel/videos
-- RSD Academy https://www.youtube.com/playlist?list=PLL_nf1OmixTT8ZPpWYcxVEjsp33y0C0o9
 - Jonathan Valvano
   Embedded Systems - Shape the World
   https://www.youtube.com/playlist?list=PL_RVM1q4YIETsC1_nFjgBF9X0jKebDucF

hardware/digital/embedded.org

@@ -1,3 +1,7 @@
+- MIT 6.172 Performance Engineering of Software Systems, Fall 2018 https://www.youtube.com/playlist?list=PLUl4u3cNGP63VIBQVWguXxZZi0566y7Wf
+- https://github.com/m3y54m/Embedded-Engineering-Roadmap
+- https://embeddedartistry.com/beginners/
+- https://embeddedartistry.com/recommended-reading/
 - https://voidstarsec.com/blog/intro-to-embedded-part-1
 - https://github.com/f3nter/HardBreak/
 - https://github.com/koutto/hardware-hacking/