All About Circuits, electronics podcast, Ford Climate Controlled Seat Module, LB11988HR, MacroFab, macrofab engineering podcast, MAX6682, memristors, MEP, Podcast, scope creep, Thermistors, uTracer

<img src="https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan.jpg" class="attachment-post-thumbnail size-post-thumbnail wp-post-image" alt="" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan.jpg 1440w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-250x188.jpg 250w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-768x576.jpg 768w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-700x525.jpg 700w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-600x450.jpg 600w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-120x90.jpg 120w" sizes="(max-width: 1440px) 100vw, 1440px" />

Podcast

124

Parker Dillmann | June 13, 2018

MEP EP#124: Letting The Loaf Out

Podcast Notes

Parker
- MAX6682 breakout board to read the thermistors
- Engineer Spotlight on All About Circuits
- Ford Climate Controlled Seat Module Breakdown
  - Peltier setup
  - Temperature feedback is via thermistor
    - 54K to 240K with the resistance around 170K at room temp
    - Possibly a NTC 200K?
  - Fan uses a LB11988HR from OnSemi
    - 3 Wire
    - Interesting setup to control the speed of the fan
    - What part is Dpak with marking 065886A
Stephen
- The uTracer 3 design update
  - Full on scope creep
  - Adding a STM32 mcu to control the relays to make it “safe”
Rapid Fire Opinion – RFO
- Digital circuits: Now with more analog!
  - Using memristors as data storage devices
  - Two memristors into the output totem-pole of a classic CMOS converter, between the usual p-mosfet and n-mosfet – effectively adding a potentiometer, whose wiper is the inverter output
  - Buy memristors?
- Interviewing engineers? Should you bring your project or not?

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<img aria-describedby="caption-attachment-4044" class="wp-image-4044 size-large" src="https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Ford-Fan-700x525.jpg" alt="Fan module from a 2015 Ford F-150." width="700" height="525" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Ford-Fan-700x525.jpg 700w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Ford-Fan-250x188.jpg 250w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Ford-Fan-768x576.jpg 768w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Ford-Fan-600x450.jpg 600w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Ford-Fan-120x90.jpg 120w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Ford-Fan.jpg 1440w" sizes="(max-width: 700px) 100vw, 700px" />

Fan module from a 2015 Ford F-150.

Fan module from a 2015 Ford F-150.

<img aria-describedby="caption-attachment-4045" class="wp-image-4045 size-large" src="https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-700x525.jpg" alt="The Fan PCB. Single layer on aluminum substrate." width="700" height="525" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-700x525.jpg 700w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-250x188.jpg 250w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-768x576.jpg 768w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-600x450.jpg 600w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan-120x90.jpg 120w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Internal-PCB-of-the-Fan.jpg 1440w" sizes="(max-width: 700px) 100vw, 700px" />

The Fan PCB. Single layer on aluminum substrate.

The Fan PCB. Single layer on aluminum substrate.

<img aria-describedby="caption-attachment-4046" class="wp-image-4046 size-large" src="https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Schematic-for-Fan-700x677.jpg" alt="Power input schematic of the fan controller." width="700" height="677" srcset="https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Schematic-for-Fan-700x677.jpg 700w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Schematic-for-Fan-250x242.jpg 250w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Schematic-for-Fan-768x743.jpg 768w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Schematic-for-Fan-600x580.jpg 600w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Schematic-for-Fan-120x116.jpg 120w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Schematic-for-Fan-32x32.jpg 32w, https://mxcdn.macrofab.com/wp-content/uploads/2018/06/Schematic-for-Fan.jpg 1440w" sizes="(max-width: 700px) 100vw, 700px" />

Power input schematic of the fan controller.

Power input schematic of the fan controller.

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

About The Hosts

Parker Dillmann is MacroFab's Co-Founder, and Lead ECE with backgrounds in Embedded System Design, and Digital Signal Processing. He got his start in 2005 by hacking Nintendo consoles into portable gaming units. He also runs the blog, longhornengineer.com, where he posts his personal projects, technical guides, and appnotes about board layout design and components. Parker graduated with a BS in Electrical and Computer Engineering from the University of Texas.

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.