⚠ This is for beginners and very much by a beginner / hobbyist
It's intended to get an intuitive overview for hobbyist needs. It may get you started, but to be able to do anything remotely clever, follow a proper course or read a good book.
Some basics and reference:
Volts, amps, energy, power · batteries · resistors · transistors · fuses · diodes ·
capacitors · inductors and transformers ·
ground
Slightly less basic: amplifier notes · varistors ·
changing voltage · baluns ·
frequency generation ·
Transmission lines · skin effect
And some more applied stuff:
IO:
Input and output pins · wired local IO · wired local-ish IO · · Various wireless · 802.11 (WiFi) · cell phone
Sensors: General sensor notes, voltage and current sensing ·
Knobs and dials ·
Pressure sensing ·
Temperature sensing ·
humidity sensing ·
Light sensing ·
Movement sensing ·
Capacitive sensing ·
Touch screen notes
Actuators: General actuator notes, circuit protection ·
Motors and servos ·
Solenoids
Noise stuff: Stray signals and noise · sound-related noise names · electronic non-coupled noise names · electronic coupled noise · ground loop · strategies to avoid coupled noise · Sampling, reproduction, and transmission distortions
Audio notes: See avnotes
Platform specific
- Arduino and AVR notes · (Ethernet)
- Microcontroller and computer platforms ··· ESP series notes · STM32 series notes
Less sorted: Ground ·
device voltage and impedance (+ audio-specific) · electricity and humans ·
power supply considerations ·
Common terms, useful basics, soldering ·
landline phones ·
pulse modulation ·
signal reflection ·
Project boxes ·
resource metering ·
SDR ·
PLL ·
vacuum tubes ·
Multimeter notes
Unsorted stuff
Some stuff I've messed with: Avrusb500v2 ·
GPS ·
Hilo GPRS ·
JY-MCU ·
DMX ·
Thermal printer ·
See also Category:Electronics.
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Inductors
Inductor intro
Core inductor (design)
Stick inductor (design)
Toroidal inductor (design)
On magnets
See also
http://electronics.stackexchange.com/questions/12930/capacitors-or-inductors
http://www.avrfreaks.net/forum/inductor-current-smoothing
Filters (application)
(compared to RC filters)
(Note: The L seems to refer to Lenz)
RL filter (application)
LC filter (application)
Choke (application)
✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.
Ferrite beads
Ferrite beads, also known as ferrite chokers, are designed to eat a certain range of frequencies, and turn it into heat.
They work as inductors, and act as a passive low-pass filter.
One thing they address are that oscillators such as clock generators act as little radio-frequency transmitters, particularly when there is something around to act like an antenna, such as wires.
So high frequencies easily get around. While most things are fine with a little high frequency EM around, not always.
So there's regulations about this.
You pass these tests by suppressing things. Ferrite beads can do this.
Note that often it's easier to suppress earlier (near the source) rather than later (on an external wire),
meaning that ferrite beads are sometimes a sign of laziness.
And in some cases they're not particularly necessary for your case, but e.g. qualifying for worldwide RF emission tests made it easier to slap one onto the cable and be done with a single variant that passes worldwide.
Note that since they're inductors, mis-applied ferrite beads could cause resonance.
So don't just slap on one you found somewhere because you think it will Magically Make Things Better.
See also:
Transformers
Named purposes / designs
✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.
Bootstrap, feedback, and other windings
Current sense transformers
Audio transformers
On cores, on windings, on taps
Going from transformer to DC - design considerations
Rectifying AC
Could I reverse primary and secondary?
Can I series-connect for higher voltages?
Can I add more transformers in parallel later for more current?
Unsorted