MEP EP#240: Disturbed Solder Accuracy

MEP EP#240: Disturbed Solder Accuracy

MEP EP#240: Disturbed Solder Accuracy

Parker

  • Got a fully automatic screen printer!
    • ESE US-2000X
    • Potentially lower our minimal paste size
  • Twitch Live Stream podcasts?
  • Amazon multimeter probes

Stephen

  • High voltage low current measurement
    • Don't want to break the connection so a traditional ammeter isn't going to work
    • Sticking with the read both sides of a resistor method
    • Caddock 1776-C681 high voltage high resistance high tolerance divider
      • 1/100 so 0 to 500v becomes 0 to 5v
    • ADC - MCP3551-E/SN
      • 22 bit
      • SPI
      • 2.4 meg ohm input impedance
    • Ideally the voltage divider has a “gain” of 0.01 but if the ADC is directly attached to the divider the gain is around 0.0096
      • Full scale would be 4.8V instead of 5V
    • Solution: add a buffer
    • AD8244BRMZ
      • Quad buffer
      • Typical offset voltage of 100uV
      • Gain error of 0.03% max on +/-15v rails
      • 10T ohm and 4pf input resistance/capacitance - 10^12
      • Gain error is now 0.009999999901 - Close enough

Jaksot(448)

EP#8: Bits That Don’t Quit

EP#8: Bits That Don’t Quit

Podcast NotesStephen and Parker do a live discussion on how the digital and analog side of the Super Simple Power Supply will interface with each other. MultiSim has been a huge part in simulating the...

25 Maalis 201639min

EP#7: The Art of Retention Force

EP#7: The Art of Retention Force

Parker has almost finalized the front panel design for the Super Simple Power Supply. Going to have a "VU" meter for how much power it is pulling.Parker is also still looking for a proper encoder that...

18 Maalis 201624min

EP#6: Mythical Transistors

EP#6: Mythical Transistors

Podcast NotesParker is still working on the Super Simple Power Supply. He is designing the front panel. He is considering using some WP1043 Kingbright LEDs.Super Simple Power Supply will have two deci...

11 Maalis 201625min

EP#5: Tilting Tubes

EP#5: Tilting Tubes

Parker ordered all the parts for the SAIM this week. The v-slot rails and brackets from OpenBuild, iES-1706 servos from Leadshine, and 3D printed parts from Shapeways.MacroFab uses 3D printed parts to...

4 Maalis 201647min

EP#4: Linear Effects of Licensing

EP#4: Linear Effects of Licensing

Audio quality of the podcast leveled up! Stephen and Parker went over to The Pharmacy Recording Studio which is run by Josh Moore. He hooked them up with 2 (!) microphones and a nice an acoustically p...

26 Helmi 201617min

EP#3: Liquid Toroidal Electrons

EP#3: Liquid Toroidal Electrons

Stephen and Parker have been testing the main opamp for the OPA541. Stephen wrote a blog post detailing the opamp tests with simulation and real world testing.GitHub link to the repository for the SSP...

19 Helmi 201622min

EP#2: Mechanical MultiSIM Monsters

EP#2: Mechanical MultiSIM Monsters

Stephen continues his work on the Stupid Simple Power Supply (SSPS). He decided to go digital voltage control over analog. Also he has been trying out MultiSIM BLUE by Mouser for circuit simulation. S...

10 Helmi 201620min

EP#1: Opamp-timal Power Supply

EP#1: Opamp-timal Power Supply

Stephen talks about the Stupid Simple Power Supply (SSPS). He designed a OPA541 breakout board for testing. See figure 1.OPA541 Datasheet : Street price of $21.88.Parker brings up that blinky LEDs are...

9 Helmi 201623min

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