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#388: CHIPS Can’t Dip

EP#388: CHIPS Can’t Dip

This week we’re joined by David Schild, the Executive Director of the Printed Circuit Board Association of America (PCBAA). PCBAA is a consortium of American companies supporting domestic production o...

28 Juli 20231h 1min

EP#387: Recursive Vending Machines

EP#387: Recursive Vending Machines

Join us as we chat with Hyr0n and Zapp from AND!XOR Group about their iconic badges for DEF CON 31. Learn about the challenges and creative process behind their badges, including the returning Snackey...

21 Juli 202353min

EP#386: When Will AI Replace Podcast Hosts?

EP#386: When Will AI Replace Podcast Hosts?

Delve into the world of AI in chip design, exploring the limitations and benefits of AI, its impact on productivity and the labor market, and the future of this technology. We also join Parker on anot...

14 Juli 202355min

EP#385: Mislabeled levels of Hell

EP#385: Mislabeled levels of Hell

In the spirit of summer, we kick off this week with a  timely discussion of whether you can cook food on the engine of your car; how hot would your exhaust pipes even need to be? Stephen shares the cu...

10 Juli 202345min

EP#384: Derivative Learning or Mathematical Consequences

EP#384: Derivative Learning or Mathematical Consequences

The concerning news of a missing submarine near the Titanic wreck site this week sparks conversation about the implications of using a $30 Logitech gamepad for steering, the importance of regulatory b...

6 Juli 20231h 2min

EP#383: Screaming into the Social Media Void

EP#383: Screaming into the Social Media Void

MEP EP# 383: Screaming into the Social Media VoidAutoDesk is dropping support and development for the dedicated Eagle EDA tool and moving efforts to the AutoDesk Fusion 360 Electronics. This has set t...

15 Juni 20231h 2min

EP#382: The Danger Pool

EP#382: The Danger Pool

MEP EP#382: The Danger PoolThe CHIPS act is in full swing with Texas Instruments, TSMC, Intel and other chip manufacturers scaling up and building new facilities in the United States. There is just on...

9 Juni 20231h 5min

EP#381: Bil Herd - Back Into the Storm

EP#381: Bil Herd - Back Into the Storm

MEP EP#381: Bil Herd - Back Into the StormBil Herd, one of the early engineers of Home Computers, joins as a guest on this week’s episode of the podcast. Bil led the hardware design for the Commodore ...

2 Juni 20231h 4min

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-ufo-bortom-rimligt-tvivel
rss-experimentet
paranormalt-med-caroline-giertz
medicinvetarna
bildningspodden
halsorevolutionen
rss-vetenskapsradion-2
4health-med-anna-sparre
rss-spraket
hacka-livet
rss-broccolipodden-en-podcast-som-inte-handlar-om-broccoli
sexet