Download: MP3
RSS Feed: Link
Twitter: @MacroFab
Runtime: (00:57:09)
Hosts:
Parker Dillmann
Stephen Kraig
Guest:
N/A
Podcast Notes
- 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
- 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
- New amp design
- Preamp Design
- R.F.O.
- Improve your circuit toolbox – Simple designs that will save your next product
- Chris Gammel gave a talk at the recent SuperCon about circuits you should add to your mental filing cabinet
- Speaking of the Super Con all the videos for the talks are live on Youtube so go give those a listen to!
- Improve your circuit toolbox – Simple designs that will save your next product
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Special thanks to whixr over at Tymkrs for the intro and outro!