EP#49: Blinding LEDs and Bypass Capacitors of Another Kind

Podcast Notes

• Last week Stephen and Parker asked listeners for names for the two conference rooms so far these are the suggestions.
  • Tony the DIYer - MacMinor and MacMajor. Some platforms the c struct that holds the mac address specifies it as a pair of major (32 bit) and minor (16 bit) values.
  • Justin Knight - pagoda for the smaller room since it doesnt have chairs.
  • Hertz and Mega Hertz
  • Vcc and Vdd
  • Power and Ground
  • SDA and SCL
  • TX and RX
  • Conferance McConferance Face
• Look for an online poll soon for the name!
• Parker was testing a customers LED board earlier this week. Fed up with blinding himself with the bright LEDs he decided to wear a welding mask. See Figure 1. The helmet can be found on amazon.
• Parker took a welding class at TXRX Hackerspace.
• Stephen has been working more on "The Greatest Resistor....in the world.". Stats below! See Figure 2.
  • Power:
    • 0.0625w
    • 40,000 resistors = 2.5kW
    • V = SQRT(P*R) = 5000V @ 0.5A
  • Voltage:
    • each resistor is 50v so 200 in series = 10kV
    • Temp Coef: 100ppm
  • Eagle File Size: 3.888 Mb which is 40,485 lines
• Space Echo just needs calibration. Anyone know how to generate these specs?
  • Feed sin wave of -50 dBm into input (See Pg 16-18 of service manual).
  • Space Echo RE-201 Service Manual
• Possible Thermal Camera to look at the heat up during powering? What kind of resolution would that camera need to be?
• Razer's Project Valerie is a radical three-screen laptop that unfolds with robot arms.
  • Tri screen laptop
  • Mechanical Keyboard
• Tesla turns on the Gigafactory. More than 2,900 people are already working at the 4.9 million square-foot facility, and more than 4,000 jobs. No info about the batteries yet.
• The Other Kind of Bypass capacitors.
  • Article not about normal bypass / decoupling caps but about feedback caps in circuits.
  • Other words bypass caps for feedback circuits.
  • Opamps have these internal feedback capacitors to reduce the high-frequency gain of the op-amp, in order to allow the amplifier to have a predictable transfer function that is stable at unity-gain.

Special thanks to whixr over at Tymkrs for the intro and outro!