EP#47: Missing Audio

EP#47: Missing Audio

Podcast Notes

  • Continuing on the Jeep Bluetooth radio hack, Parker designed the audio voltage bias switcher board. It will adjust the Pk-Pk voltage and DC offset of the Bluetooth adapter to what the radio expects. Ordered it through MacroFab. See Figure 1 and 2.
  • Parker also started designing an amplifier for Spooky Pinball. Based on the TDA7387 which is a 4 x 41 W quad bridge car radio amplifier. Designing it to be as inexpensive but as LOUD as possible. Currently down to $15.91 an assembled board in QTY 500. Need a beefy heatsink and powersupply to handle it.
  • Stephen has been working on his Resistor of Death (name to be decided). By combining resistors in series and parallel, Stephen will be able to make a large high tolerance resistor. The best tolerance resistor on mouser is 0.005%. Can we get better than that with 1% resistors? N = 1/0.005 = 200 resistors FOR EACH PARALLEL/SERIES COMBO Total resistors = 40,000.
  • Sorry RFO section got cut off due to a problem in the software recording. :(

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

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...

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EP#7: The Art of Retention Force

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18 Maalis 201624min

EP#6: Mythical Transistors

EP#6: Mythical Transistors

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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

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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

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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...

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