EP#145: The Vox in a Box Roxs
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.

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

Jaksot(448)

EP#46: First Annual MacroFab Star Wars Christmas Special: PART B

EP#46: First Annual MacroFab Star Wars Christmas Special: PART B

Podcast NotesPart B Weapons of Star Wars (continued) Light Sabers Elegant weapon for a more civilized age. Lots of mystical lore surrounding this weapon.Force aligned crystals are necessary for their ...

16 Joulu 201626min

EP#46: First Annual MacroFab Star Wars Christmas Special: PART A

EP#46: First Annual MacroFab Star Wars Christmas Special: PART A

Podcast NotesPart A Vehicles of Star Wars Tie Fighters: Twin Ion Engine. This tech exists but its super low power but efficient.Hovercraft and levitation. Land speeders, Pod Racers, Repulsor Lift tech...

16 Joulu 201637min

EP#46: First Annual MacroFab Star Wars Christmas Special

EP#46: First Annual MacroFab Star Wars Christmas Special

First Annual MacroFab Star Wars Christmas SpecialThis is a reupload of Episode 46 into one continuous podcast. Originally it  was broken into 4 parts. Vehicles of Star WarsTie FightersHovercraft and l...

16 Joulu 20162h 4min

EP#45: Zero Sum Resistor Arrays

EP#45: Zero Sum Resistor Arrays

Podcast NotesParker has a new update to the Jeep Bluetooth Radio Mod. To level shift the Bluetooth audio to what the  TDA7340S expects, Parker is going to build a differential opamp. The Bluetooth aud...

9 Joulu 201627min

EP#44: Drive By DNA Destruction

EP#44: Drive By DNA Destruction

Podcast NotesPopping in last weeks audio was probably due to a cheap USB cable. Stephen and Parker recorded last week on a laptop with a USB powered mic preamp that has less then stellar power filteri...

2 Joulu 201638min

EP#43: Jeep Radio Hacking with a Side of Synth

EP#43: Jeep Radio Hacking with a Side of Synth

Podcast NotesThis podcast was recorded at the MacroFab Engineering location. See Figure 1.MacroFab had its annual Thanksgiving Potluck today. See Figure 2.Parker has been working more on the Jeep Radi...

24 Marras 201642min

EP#42: Two Brothers of MacroFab

EP#42: Two Brothers of MacroFab

Podcast NotesJustin Knight and Brandon Knight talk a bit about their background and how they got into technology and startups. They have always worked together on projects and at companies. See Figure...

18 Marras 201655min

EP#41: Houston Maker Faire 2016

EP#41: Houston Maker Faire 2016

Podcast NotesMacroFab will be at the Houston Maker Faire this weekend. Stop by and meet us!The FX Dev board's crowd funding campaign is almost ready to launch. The video for it is in post production n...

11 Marras 201627min

Suosittua kategoriassa Tiede

rss-mita-tulisi-tietaa
tiedekulma-podcast
rss-poliisin-mieli
docemilia
rss-duodecim-lehti
utelias-mieli
filocast-filosofian-perusteet
rss-laakaripodi
rss-opeklubi
rss-lihavuudesta-podcast
rss-sosiopodi
sotataidon-ytimessa
mielipaivakirja
radio-antro
rss-radplus
rss-luontopodi-samuel-glassar-tutkii-luonnon-ihmeita