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#100: The Q&A Episode

EP#100: The Q&A Episode

Iris WeedenMacroFab's Marketing DirectorAward-winning marketer with ten years of experienceNative Houstonian and lover of music, dogs, and beersEpisode 100!!!!!!The Q&A EpisodeThanks to our listeners ...

26 Des 20171h 7min

EP#99: Moses Parting the Sea of Traces

EP#99: Moses Parting the Sea of Traces

PCB material as structural elements and enclosuresFR4 Material - glass-reinforced epoxy laminate sheetsCustom face plates aren’t cheap - the solution? Face plate out of PCB material!Silk screening and...

20 Des 201746min

EP#98: Second Annual MacroFab Star Wars Christmas Special: Jar Jar on a Harley

EP#98: Second Annual MacroFab Star Wars Christmas Special: Jar Jar on a Harley

Taylor SmithWorks at MacroFab as the Production Account ManagerManage all of our large customers as they go through prototyping to full productionGraduated from Texas A&M last fallJoined the MacroFam ...

13 Des 20171h 25min

EP#97: The Internet of Mothers

EP#97: The Internet of Mothers

Agustin PelaezElectrical engineer from UPB/FH MünsterHelped engineer a remote monitoring solution for Airbus GermanyFounded the IoT Application Enablement platform Ubidots.comCameron KlotzJoined Ubido...

7 Des 201747min

EP#96: I Expect You To be Bored Mr. Bond

EP#96: I Expect You To be Bored Mr. Bond

Episode 100 is coming up! It’ll be a Q&A session - so send in your questions to podcast@macrofab.com2nd Annual Star Wars Xmas Special Engineering Podcast. Check out the video from last year!ParkerBuil...

29 Nov 201732min

EP#95: Putting English on Electrons

EP#95: Putting English on Electrons

The Houston meetup is coming up next week. RSVP here if you are in town!Mike HackerBox - LootCrate for Hardware and Software hackersParker PinHeck EOTL REV8 UpdateAnother shout out to Chris Gammell an...

22 Nov 201737min

EP#94: Al Williams and the Field Programmable Gate Arrays

EP#94: Al Williams and the Field Programmable Gate Arrays

FPGA Mega Podcast with Al Williams:What is an FPGA? Field-programmable gate arrayBunch of logic gates and sea of gates, we tell them what to doWriting hardware description of what it will do - writing...

15 Nov 20171h 6min

EP#93: Glue A Penny On It

EP#93: Glue A Penny On It

Episode 100 is coming up! It’ll be a Q&A session - so send in your questions to podcast@macrofab.com2nd Annual Star Wars Xmas Special Engineering Podcast. Check out the video from last year!Parker Upd...

8 Nov 20171h 4min

Populært innen Vitenskap

fastlegen
tingenes-tilstand
smart-forklart
jss
sinnsyn
rekommandert
rss-rekommandert
villmarksliv
tomprat-med-gunnar-tjomlid
forskningno
rss-paradigmepodden
fjellsportpodden
aldring-og-helse-podden
tidlose-historier
diagnose
pod-britannia
vett-og-vitenskap-med-gaute-einevoll
nordnorsk-historie
nevropodden
dekodet-2