EP#145: The Vox in a Box Roxs

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.

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

Avsnitt(448)

EP#84: Hungry Hungry Op Amps

EP#84: Hungry Hungry Op Amps

Hungry Hungry Op AmpsParker PinHeck UpdateThe Pinotaur? Is that a good name? Draw up what you think a Pinotaur will look like!Raspberry Pi 3 Compute module works wellPinHeck EOTL (End Of The Line) REV...

7 Sep 201733min

EP#83: The One Man Entertainment Machine

EP#83: The One Man Entertainment Machine

The One Man Entertainment MachineWe would like to thank everyone that emailed us here at MacroFab with your concerns over our safety as we faced Hurricane Harvey. We are happy and grateful to report t...

1 Sep 20171h 10min

EP#82: Make Electrons Flow Right?

EP#82: Make Electrons Flow Right?

Make electrons flow right?August Hardware & Electronics Engineering Meetup by MacroFab & Mouser Electronics event is live! Wednesday August 30th in Houston, TexasThis month's topic is Lean Manufacturi...

25 Aug 201730min

EP#81: Eddie Samuels and Comma.ai

EP#81: Eddie Samuels and Comma.ai

Eddie Samuels and Comma.aiAugust Hardware & Electronics Engineering Meetup by MacroFab & Mouser Electronics event is live! Come grab some food, beer, and socializing if you’re in the Houston area.Eddi...

18 Aug 201746min

EP#80: The Brick That Shall Not Be Named: A Joe Broms Story

EP#80: The Brick That Shall Not Be Named: A Joe Broms Story

The Brick That Shall Not Be Named: A Joe Broms StoryAugust Hardware & Electronics Engineering Meetup by MacroFab & Mouser Electronics event is live! Come grab some food, beer, and socializing if you’r...

11 Aug 201755min

EP#79: Dueling OpAmp Inputs

EP#79: Dueling OpAmp Inputs

Dueling OpAmp InputsParker Article is lagging behind. Will be done on Friday, promise!Rewiring the Jeep Turn signals. The old wiring was interesting. The side marker bulb socket is isolated from groun...

4 Aug 201753min

EP#78: No Guru Here

EP#78: No Guru Here

No Guru HereParker Gave a presentation at the MacroFab Engineering meetup about how to turn on your Electronics Project.Removal of power sourcePhysical Power SwitchSoft Power SwitchDetails about MCU s...

28 Juli 201751min

EP#77: The IdeaFab Podcast

EP#77: The IdeaFab Podcast

The IdeaFab PodcastJuly Hardware & Electronics Engineering Meetup by MacroFab & Mouser Electronics event is live! Come grab some food, beer, and socializing if you’re in the Houston area.Everyone gets...

21 Juli 20171h 9min

Populärt inom Vetenskap

p3-dystopia
svd-nyhetsartiklar
pojkmottagningen
dumma-manniskor
allt-du-velat-veta
kapitalet-en-podd-om-ekonomi
det-morka-psyket
rss-vetenskapsradion
rss-experimentet
rss-ufo-bortom-rimligt-tvivel
medicinvetarna
paranormalt-med-caroline-giertz
bildningspodden
rss-vetenskapsradion-2
halsorevolutionen
dumforklarat
vetenskapsradion
hacka-livet
rss-spraket
rss-broccolipodden-en-podcast-som-inte-handlar-om-broccoli