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#92: Through Hole on Cruise Control

EP#92: Through Hole on Cruise Control

Parker Jeep Cruise Control update Ordered a late model TJ wiring harnessSpeed Control Servo: 4669979Cable: 4854156Vacuum Line: 52109525ADJeep Electrical Control Have wiring diagram doneBussmann 15303-...

2 Nov 201759min

EP#91: An Ampersand Made Me A Hero

EP#91: An Ampersand Made Me A Hero

Kaylan SmithHouston native, rice owl , UX designer, artist, die hard Astros fan, and MacroFaber since July 2016One of the strange breeds that went from being an artist to software developmentAttended ...

26 Okt 201747min

EP#90: Development Board Guilt

EP#90: Development Board Guilt

Chris Gammell Electrical engineer and electronics instructorRuns an online course is called Contextual Electronics and is host for the podcast The Amp HourGuest on the MacroFab Engineering podcast epi...

20 Okt 201759min

EP#89: Randomly Determined

EP#89: Randomly Determined

Parker Tom Anderson Long time listener just launched his own podcast called Function.It is a podcast that is about Art and Engineering and where those two meet.Jeep Factory Cruse Control Most of the p...

12 Okt 201735min

EP#88: TLDR; Life

EP#88: TLDR; Life

Stephen iSpindel - First time on the MEP: Introduce a tropic and finish it in 2 episodes!Parker Next Jeep Project: Factory Cruise Control RetroFit Currently missing the wiring to go to the PCM (Power ...

6 Okt 20171h 1min

EP#87: Liquid Hot “Magma”

EP#87: Liquid Hot “Magma”

Parker PinHeck update! Rev8 EOTLAdding RPI3 CM module to the board.Reorganized the Schematic after 5 years of hacks and additionsPrinted a new HAKKO keyNew key costs $15!3D printed one in 17 minutesSt...

26 Sep 201746min

EP#86: Don’t Try This At Home

EP#86: Don’t Try This At Home

Annika O'BrienFounder and driving force behind both the LA Robotics Club and Houston Robotics ClubFocus into creating communities for people of all ages who have an interest in learning more about Rob...

22 Sep 20171h 57min

EP#85: Space Engineers VS Caffeinated Chipmunks

EP#85: Space Engineers VS Caffeinated Chipmunks

Space Engineers VS Caffeinated ChipmunksSeptember 13th, 2017 was the 4th anniversary of MacroFab!Hardware and Electronics Engineering Meetup for September event is live!How to Design Products with Lea...

14 Sep 201739min

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