Circuit Break - A MacroFab Podcast6 Marras 2018

EP#145: The Vox in a Box Roxs

Stephen's Vox in a Box
- Preamp Design
  - Vox AC30 preamp - 3 gain stages with a cathode follower and a phase inverter
  - Phase inverter - create differential signals for the power amp input
  - Drop signal using voltage dividers and mosfet buffers
  - 320V phase inverter to 18V buffer drive
  - Built point to point on an aluminum plate for easy modification and testing
- Power Amp Design
  - TPA3116 Class D amplifier
  - LM311 comparator mute circuit for start up mute ~5 to 10 Seconds
  - Runs at 400KHz - Left open pads for boosting this up to 1.2MHz
    - Is there an advantage at running at higher frequencies?
- Power Supply Design
  - TPS40210 Switching controller into a diode/cap ladder voltage multiplier
  - 7 stages of multiplication leads to ~50V per stage
  - Variable Switching from 35KHz to 1000KHz
  - PMP8621 Appnote
- Testing the Vox in a Box
  - Been going nonstop for weeks now
  - Have taken it up to nearly 60 Watts without problems
- Layout of the PCB
  - Multiple ground system with master start
  - Each sub circuit has its own ground return
  - 8 Master star ground returns
  - 4 layers
- Issues with the current design
  - High Voltage SMPS does not like high capacitive load
  - Ground for signal input is very important - Nearly all noise is dominated by this single point
    - Alligator clips for signal patching are not low noise…
  - Cold Heater impedance
- Current Schematic for the Vox in a Box
- Fusion 360
  - New amp design
    - Learning by building a virtual amp
  - Vox in a box
    - Going to model the whole design to ensure proper fit
R.F.O.
- Improve your circuit toolbox – Simple designs that will save your next product
  - Chris Gammel gave a talk at the recent SuperCon about circuits you should add to your mental filing cabinet
  - Speaking of the Super Con all the videos for the talks are live on Youtube so go give those a listen to!

Tags: Chris Gammel, electronics podcast, Fusion 360, Hackaday, LM311, MacroFab, macrofab engineering podcast, MEP, PMP8621, Preamp, SuperCon, TPA3116, TPS40210, Vox AC30, Vox in a Box

Kokeile Premiumia

Nauti 14 päivää ilmaiseksi

Tilaa Premium

Jaksot(448)

EP#60: It’s a She, Right?

Podcast NotesJOSH is our guest this week Owner of Abbadad ProductionsOwner of Castle Bravo StudiosFounder of V33R TechnologiesOwner of the Space Echo RE-201Audio Engineer behind the recording of the M...

24 Maalis 20171h 1min

EP#59: Grass Fed PCBs

Podcast NotesMacroFab and Mouser Electronics have teamed up to create a free monthly meetup in Houston for anyone involved with hardware & electronics engineering or manufacturing. Hosted on the last ...

17 Maalis 201754min

EP#58: Tungsten I-Beams

Podcast NotesPatrick Renner and Kelly O'Brien are our guests this week.Flying Carpet CreativeInstagramFacebookVimeoPublic sculpture group dedicated to dynamic place makingExcited about the opportunity...

10 Maalis 201756min

EP#57: Mr. Williams, Your Book Changed My Life

Podcast NotesAl Williams is our guest this week. Embedded System DesignerBlogger for HackadayAuthor of many booksHam Radio OperatorHackaday is a very diverse set of writers. Each writer each has thei...

3 Maalis 201740min

EP#56: Gotta Look Pro

Podcast NotesWe would love to hear from our listeners. Tell us what you think, your current projects, any topics you would like us to cover, or just say “hello”. To reach us follow us on Twitter @Macr...

24 Helmi 201737min

EP#55: Unnecessary Engineering

17 Helmi 201736min

EP#54: Stay Hydrated While Gaming

10 Helmi 201748min

EP#53: Aditya and Mijael of Kinetic with “The Device”

Podcast NotesAditya BansalCo-founder and CTO of KineticGraduated Purdue University with a PhD in Electrical and Computer EngineeringWorked at IBM Research Center before KineticDeveloped a motion track...

3 Helmi 201742min

Kaikki yhdessä sovelluksessa

Kuuntele kaikki suosikkipodcastisi ja -äänikirjasi yhdessä paikassa.

Sinulle valikoitua sisältöä

Podme-sovelluksessa kokoat suosikkisi helposti omaan kirjastoosi. Saat meiltä myös kuuntelusuosituksia!

Jatka kuuntelua koska tahansa

Voit jatkaa siitä mihin jäit, myös offline-tilassa.

Premium

9,99 €/kk

Kaikki premium-podcastit
Ei mainoksia
Ei sitoutumista, peruuta koska tahansa

Aloita 14 päivän kokeilu

Premium

13,99 €/kk

Kaikki premium-podcastit
Ei mainoksia
Ei sitoutumista, peruuta koska tahansa
Yksi lisäkäyttäjä

Kokeile 14 päivää maksutta

Suosittua kategoriassa Tiede

rss-luontopodi-samuel-glassar-tutkii-luonnon-ihmeita

Tarinat ja äänet, joita rakastat kuunnella

Kuuntele kaikki suosikkipodcastisi ja -äänikirjasi

Lue lisää