EP#74: Reverse Biasing Opamps

Reverse Biasing Opamps

• Parker 
  • Been learning Python and OpenCV
    • OpenCV is an open source computer vision library
    • PyImageSearch
    • Setup PyCharm
    • Using Requests to use and get information from the MacroFab API
    • Built a 3D printed chassis for holding a 5MP USB camera
    • Taking pictures of PCBs and removing lens distortion
  • RPI3 CM PCB done 
    • Will be testing over the weekend
    • 6 Pack of beer riding on this board!
    • Board does power up correctly.
  • COMPIOT board Opamp blew up :( 
    • Symbol on Schematic unlabeled for the power inputs of the opamp
• Stephen
  • Still Making the three synth modules (two envelops and one filter) 
    • Waiting on the CA3146 transistor IC
    • This is an obsolete part
    • Stephen wants to use it for legacy reasons
  • Making some power supplies for tube mics (the same one that we made for JOSH). 
    • Have to figure out how to make a 6.3V or 12.6V high current rail along with a 200V to 300V low current rail.
    • Stephen is going to use transformers that I have at my shop.
    • One drops 120VAC to 10VAC and the other raises the 10VAC up to 230VAC
    • The 10VAC rectified can potentially give 12.6VDC. If not I can drop it to 6.3VDC.
    • The 230VAC rectified can become 325VDC.
• Pick Of the Week (POW) 
  • 130-in-1 Electronic Playground from SparkFun
    • With the closure of Radio Shack where would you buy one of these intro kits?
    • $50 Is cheaper then Radio Shack even!
• Rapid Fire Opinion (RFO) 
  • Fail of the Week: Museum Buttons - Hack A Day 
    • Industrial buttons are not really kid proof
  • Wood Lichtenberg - Instructables 
    • 12kV 35mA - Neon Sign Transformer PSU
    • Baking soda in water as the conductor for electricity
    • Marinate wood in baking soda water mix
    • 342,857.1428 ohms to pull the entire PSU load
  • Qualcomm fingerprint sensor enables virtual home button - Electronics Weekly
    • Qualcomm has developed an ultrasonic fingerprint sensor which can operate under the glass of a mobile device avoiding the need for a mechanical home button. It also detects heartbeat and blood flow.
    • 800 µm of cover glass and up to 650 µm of aluminum