--- title: "Videos" url: "https://nearfieldnotes.com/videos/" site: "Near Field Notes" --- # Videos Short videos on circuit boards, one per topic, newest first. Each links to its note when there is one. - [CRCs on fast links](https://nearfieldnotes.com/videos/crc/): How does a CRC catch bad bits, and what do fast links do when it fails? 3:14, with sound. [Note 28](https://nearfieldnotes.com/notes/crc/). - [Line codes](https://nearfieldnotes.com/videos/line-codes/): Why do fast serial links use line codes like 8b/10b? 3:07, with sound. [Note 26](https://nearfieldnotes.com/notes/line-codes/). - [Trace or U.FL jumper](https://nearfieldnotes.com/videos/ufl-jumper/): When does a U.FL jumper beat a trace to the antenna? 0:47, with sound. [Note 25](https://nearfieldnotes.com/notes/ufl-jumper/). - [I3C vs I2C](https://nearfieldnotes.com/videos/i3c-vs-i2c/): What is I3C, and how does it differ from I2C? 2:27, with sound. [Note 24](https://nearfieldnotes.com/notes/i3c-vs-i2c/). - [Capacitors](https://nearfieldnotes.com/videos/capacitor-types/): Which kind of capacitor should feed a load? 2:39, with sound. [Note 13](https://nearfieldnotes.com/notes/capacitor-types/). - [LiPo vs LiFePO4](https://nearfieldnotes.com/videos/lipo-vs-life/): How does a LiFePO4 cell differ from a LiPo? 3:04, with sound. [Note 18](https://nearfieldnotes.com/notes/lipo-vs-life/). - [Power inductors](https://nearfieldnotes.com/videos/inductor-types/): Does it matter how a 4.7 µH inductor is built? 2:14, with sound. [Note 12](https://nearfieldnotes.com/notes/inductor-types/). - [Battery balance](https://nearfieldnotes.com/videos/battery-balance/): Why does a LiPo pack need balancing? 2:26, with sound. [Note 15](https://nearfieldnotes.com/notes/battery-balance/). - [USB-C alt modes](https://nearfieldnotes.com/videos/usb-c-alt-modes/): What can a USB-C port carry besides USB? 1:51, with sound. [Note 23](https://nearfieldnotes.com/notes/usb-c-alt-modes/). - [PHY and link layer](https://nearfieldnotes.com/videos/phy-link/): What does the PHY do, and what does the link layer do? 1:58, with sound. [Note 14](https://nearfieldnotes.com/notes/phy-link/). - [GaN vs silicon](https://nearfieldnotes.com/videos/gan-vs-si/): Why are USB-C chargers going GaN? 2:02, with sound. [Note 11](https://nearfieldnotes.com/notes/gan-vs-si/). - [Spread spectrum](https://nearfieldnotes.com/videos/spread-spectrum/): What does spread spectrum do to a buck’s EMI test? 1:19, with sound. [Note 6](https://nearfieldnotes.com/notes/spread-spectrum/). - [Zero-voltage switching](https://nearfieldnotes.com/videos/zvs/): What is zero-voltage switching, and what does it save? 2:09, with sound. [Note 10](https://nearfieldnotes.com/notes/zvs/). - [SIMO converters](https://nearfieldnotes.com/videos/simo/): Can one inductor feed three rails? 0:44, with sound. [Note 22](https://nearfieldnotes.com/notes/simo/). - [Sense position](https://nearfieldnotes.com/videos/sense-position/): Low side, high side or in line: where should a motor drive sense current? 0:49, with sound. [Note 19](https://nearfieldnotes.com/notes/sense-position/). - [Shunt taps](https://nearfieldnotes.com/videos/shunt-taps/): Where do you tap a 0.5 mΩ shunt? 0:19, with sound. [Note 5](https://nearfieldnotes.com/notes/shunt-taps/). - [Antenna ground](https://nearfieldnotes.com/videos/antenna-ground/): How much ground does a 2.4 GHz PCB antenna need? 0:22, with sound. [Note 3](https://nearfieldnotes.com/notes/antenna-ground/). - [FET choice](https://nearfieldnotes.com/videos/fet-choice/): Is the FET with the lowest Rds(on) the best one? 0:19, with sound. [Note 20](https://nearfieldnotes.com/notes/fet-choice/). - [Chip journeys](https://nearfieldnotes.com/videos/chip-journeys/): Where does a chip travel before it reaches your board? 0:18, no sound. [Note 9](https://nearfieldnotes.com/notes/chip-journeys/). - [Thermal relief](https://nearfieldnotes.com/videos/thermal-relief/): Should a ground pin tie into the plane through a thermal relief? 0:14, no sound. [Note 7](https://nearfieldnotes.com/notes/thermal-relief/). - [Power quadrants](https://nearfieldnotes.com/videos/power-quadrants/): What are 1-, 2- and 4-quadrant power supplies? 0:10, no sound. [Note 21](https://nearfieldnotes.com/notes/power-quadrants/). - [Eye diagram](https://nearfieldnotes.com/videos/eye-diagram/): How do you read an eye diagram? 0:10, no sound. [Note 8](https://nearfieldnotes.com/notes/eye-diagram/). - [Via stubs](https://nearfieldnotes.com/videos/via-stubs/): How long a via stub can a fast link take? 0:09, no sound. [Note 17](https://nearfieldnotes.com/notes/via-stubs/). - [USB-C shell](https://nearfieldnotes.com/videos/usb-c-shell/): Should a USB-C shell go straight to ground, or through an RC? 0:09, no sound. [Note 2](https://nearfieldnotes.com/notes/usb-c-shell/). - [Car camera coax](https://nearfieldnotes.com/videos/car-camera-coax/): How does one coax carry a car camera’s video, control and power? 0:10, no sound. [Note 27](https://nearfieldnotes.com/notes/car-camera-coax/). - [TDR](https://nearfieldnotes.com/videos/tdr/): How do you read a TDR trace? 0:14, no sound. [Note 16](https://nearfieldnotes.com/notes/tdr/). - [Gate ringing](https://nearfieldnotes.com/videos/gate-ringing/): How hard should you drive a half bridge? 0:12, no sound. [Note 4](https://nearfieldnotes.com/notes/gate-ringing/). - [Ground cut](https://nearfieldnotes.com/videos/ground-cut/): Should you cut ground under connector pads? 0:12, no sound. [Note 1](https://nearfieldnotes.com/notes/ground-cut/). --- Source: https://nearfieldnotes.com/videos/