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Circuit Break Podcast #47

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Tour MacroFab's ITAR-Compliant Facility

December 23, 2016, Episode #47

This episode suffered from a recording glitch so only half the audio exists. Sorry :(

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. 🙁
Figure 1: Schematic for the level shifter Jeep Bluetooth audio switcher.

Figure 1: Schematic for the level shifter Jeep Bluetooth audio switcher.

Figure 2: Jeep BT Switcher ordered through MacroFab.

Figure 2: Jeep BT Switcher ordered through MacroFab.

About the Hosts

Parker dillmann
  Parker Dillmann

Parker is an Electrical Engineer with backgrounds in Embedded System Design and Digital Signal Processing. He got his start in 2005 by hacking Nintendo consoles into portable gaming units. The following year he designed and produced an Atari 2600 video mod to allow the Atari to display a crisp, RF fuzz free picture on newer TVs. Over a thousand Atari video mods where produced by Parker from 2006 to 2011 and the mod is still made by other enthusiasts in the Atari community.

In 2006, Parker enrolled at The University of Texas at Austin as a Petroleum Engineer. After realizing electronics was his passion he switched majors in 2007 to Electrical and Computer Engineering. Following his previous background in making the Atari 2600 video mod, Parker decided to take more board layout classes and circuit design classes. Other areas of study include robotics, microcontroller theory and design, FPGA development with VHDL and Verilog, and image and signal processing with DSPs. In 2010, Parker won a Ti sponsored Launchpad programming and design contest that was held by the IEEE CS chapter at the University. Parker graduated with a BS in Electrical and Computer Engineering in the Spring of 2012.

In the Summer of 2012, Parker was hired on as an Electrical Engineer at Dynamic Perception to design and prototype new electronic products. Here, Parker learned about full product development cycles and honed his board layout skills. Seeing the difficulties in managing operations and FCC/CE compliance testing, Parker thought there had to be a better way for small electronic companies to get their product out in customer's hands.

Parker also runs the blog, longhornengineer.com, where he posts his personal projects, technical guides, and appnotes about board layout design and components.

Stephen Kraig
  Stephen Kraig

Stephen Kraig began his electronics career by building musical oriented circuits in 2003. Stephen is an avid guitar player and, in his down time, manufactures audio electronics including guitar amplifiers, pedals, and pro audio gear. Stephen graduated with a BS in Electrical Engineering from Texas A&M University.

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

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