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

Episoder(448)

EP#132: Does not respond after opening LOUD?

EP#132: Does not respond after opening LOUD?

MacroFab Design Contest: Blink an LED Sponsored by Mouser ElectronicsMore information can be found on the MacroFab BlogGet your blink on!ParkerMEP SAO was completed and an article was written about it...

8 Aug 201829min

EP#131: Scott Swaaley and MAKESafe Tools

EP#131: Scott Swaaley and MAKESafe Tools

Scott SwaaleyElectrical Engineer from California Polytechnic State UniversityStarted his career rewiring 18th century tall shipsDesigned electrical systems for hospitals and data centers before becomi...

1 Aug 20181h 5min

EP#130: Free Form Jazz Welding

EP#130: Free Form Jazz Welding

Chris Gammel over at The Amp Hour gave the MacroFab Engineering Podcast a shout out for our podcast with Chris Church for our Tariff discussionThe Amp Hour also hit episode 400! Congrats!ParkerMEP SAO...

25 Jul 201859min

EP#129: Trebuchet VS Opamps

EP#129: Trebuchet VS Opamps

ParkerConnectors for the Jeep PCM where a perfect match! P/Ns Black Connector: 4-1437290-5White Connector: 4-1437290-6Grey Connector: 4-1437290-7Still waiting on the MAX6682 breakout boardGitHub RepoO...

18 Jul 201853min

EP#128: Git on the Darwin Wagon

EP#128: Git on the Darwin Wagon

ParkerMEP Shitty Add-On EFM8SB10F2G based like the MacroWatch V215 addressable channels of LED blinking23 Red 0603 LEDs in totalConnectors for the Jeep PCM PCM connector locks are starting to break du...

11 Jul 201853min

EP#127: Tariff Impacts with Chris Church

EP#127: Tariff Impacts with Chris Church

Chris ChurchThe Chief Product Officer of MacroFabFounded MacroFab along with ParkerRecent article Decoding Tariff Impacts on US Electronics ManufacturingWhat kind of items in the Tariff list will impa...

5 Jul 20181h 16min

EP#126: Space Engineering

EP#126: Space Engineering

ParkerMAX6682 breakout board finished and ordered This is for the thermistorsGitHub repo for the board filesNew Jeep, The Grande Wagoneer A/C doesn’t work as expectedFound the FSM and Schematic Schema...

27 Jun 20181h 8min

EP#125: The Open Source Episode with Robert Keim

EP#125: The Open Source Episode with Robert Keim

Robert KeimA graduate from the University of California of San Diego with a bachelor’s degree in electrical engineeringTechnical Director for All About CircuitsExtensive experience in a wide variety o...

20 Jun 201856min

Populært innen Vitenskap

fastlegen
smart-forklart
tingenes-tilstand
jss
sinnsyn
rekommandert
villmarksliv
rss-rekommandert
forskningno
tomprat-med-gunnar-tjomlid
vett-og-vitenskap-med-gaute-einevoll
fjellsportpodden
rss-paradigmepodden
pod-britannia
aldring-og-helse-podden
tidlose-historier
diagnose
nordnorsk-historie
nevropodden
rss-lundqvist-podden