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electrical engineering notes

i never studied electrical engineering, and generally am a complete novice.

below are some notes i've been taking as i learn. i'm also taking notes on

specific [integrated-circuits] while learning about making a

[diy-synthesizer].

laws

ohms law

I = current (amperes)

V = voltage (volts)

R = resistance (ohms)

I = V / R
V = I * R
R = V / I

faraday's law

predicts how a magnetic field will interact with an electric circuit to produce

a electromagnetic field, which is, electromagnetic induction

The electromotive force around a closed path is equal to the negative of the
time rate of change of the magnetic flux enclosed by the path.

units

* also 2K8 means 2800 for example

components

diode

one side has no resistance, other is infinite (ideally).

they ensure current flows in one direction

cathode - short leg: negative end

anode - long leg: positive end

light emitting diode (LED) - converts electricity into light

resistor

resistors simply resist current! then converts current into heat.

resistors are made out of insulators and conductors.

more insulators is equal to more resistance.

resistors have stripes on them. read about the [electronic color code].

resistors also can serve as heating elements.

if you think about a toaster, or a hair dryer, they function by means of the same mechanism as resistors.

capacitors

stores electric charge in an electric field. it is :

electrolitic capacitors are bigger - they are polarized.

cermaic capacitors don't store very much charge - not polarized.

potentiometer

a three terminal resistor.

there is dial against a graphite disk

the more graphite that it has to go through, the more resistance.

the pivot point is connected to the middle.

side pins are the opposite sides.

the terms are called:

integrated circuit

a specific set of capacitors, inductors, transistors, resistors in a circuit.

these look like small "chips". "living bug" position refers to it being with

its legs down. and the flat part is at the top.

the pins on an IC have numbers like so:

10 9 8 7 6
 | | | | |
|----------|
|\         |
| |        |
|/         |
|----------|
 | | | | |
 1 2 3 4 5

where the left side has a marker like a half circle

voltage divider

BJT

* emitter

* base

* collector

FET

* source

* gate

* drain

VCC VEE VDD VSS

* VCC: Voltage Collector Collector

* VDD: Voltage Drain Drain

* VEE: Voltage Emitter Emitter

* VSS: Voltage Source Source

Read more about the history of these names [here].

ADC

short for Analog to Digital Converter

op-amp

specific integrated circuits

i decided to start keeping track of specific ICs in the [integrated-circuits] page.

CMOS 4000 Series

schematics

within electrical engineering, we need to read schematics. they're designs that

specify the components of a electrical circuit. reading schematics mostly

involves learning a number of small icons used as a visual language to

represent components. see this useful

[sparkfun]

guide on reading schematics.

bom

BOM usually stands for bill of materials - a list of all the components or eletronics or pieces used in a circuit or build.

protocols

I2C

SPI

UART

Gemini Links:

index and recent changes

directory of all pages

integrated-circuits

diy-synthesizer

integrated-circuits

Web Links:

electronic color code

here

wikipedia

sparkfun

Wikipedia

Wikipedia

Wikipedia