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Circuit Break Podcast #68

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May 19, 2017, Episode #68

More compressor IoT work, calibrating the space echo, and Stephen "plays" his synth.
  • Parker
    • IoT Compressor Update with part list!
      • LSM9DS1
        • IMU for vibration sensing
        • iNEMO inertial module: 3D accelerometer, 3D gyroscope, 3D magnetometer
        • 3.3V, I2C
      • SPU0410HR5H-PB
        • MEMS Microphone
        • 3.3V
        • Analog signal, will be boosted with an opamp
      • TMP102
        • Board Mount Temperature Sensors Low Power Digital Temp Sensor
        • 3.3V, I2C
      • PX3AN2BS250PAAAX
        • Pressure Transducer
        • 1/8″ NPT Male fitting
        • 5.0V
        • Analog output 0.5V – 4.5V over pressure range
      • 6225AXXSZS-DC3
        • SSR to control the compressor switch
        • 3VDC to 32VDC control signal
        • Place 10ohm in series from pin from particle photon for protection.
        • TVS 3.3V for transient protection.
  • Stephen
    • Voltage Standard Calibration complete!
      • Used the Keithley DMM7510 to dial in the voltage standard.
    • Synth Update: Now with sound effects!
      • Stephen played a bunch of warbles
      • Only one section is working at the moment – VCO – voltage controlled oscillator
      • Next update – rest of VCL complete. MIDI control – animator up and running. LFO low-frequency oscillator done.
    • Space Echo is now working (woohoo)
      • Mechanical adjustments are calibrated too!
      • Break the tape in to let it run, the sound gets better.
  • Pick Of the Week (POW)
    • OPA549
      • High-Voltage, High-Current Op Amp, Excellent Output Swing
      • 8A Continuous 60V
      • $23.44
      • Could be used for the SSPS
  • Rapid Fire Opinion (RFO)
Figure 1: Stephen getting the VCO working on his Synth design.

Figure 1: Stephen getting the VCO working on his Synth design.

Figure 1: Block diagram for the Synth. Coffee stain included.

Figure 1: Block diagram for the Synth. Coffee stain included.

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 is a component engineer working in the aerospace industry. He has applied his electrical engineering knowledge in a variety of contexts previously, including oil and gas, contract manufacturing, audio electronic repair, and synthesizer design. A graduate of Texas A&M, Stephen has lived his adult life in the Houston, TX, and Denver, CO, areas.

Stephen has never said no to a project. From building guitar amps (starting when he was 17) to designing and building his own CNC table to fine-tuning the mineral composition of the water he uses to brew beer, he thrives on testing, experimentation, and problem-solving. Tune into the podcast to learn more about the wacky stuff Stephen gets up to.

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

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