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March 4, 2020, Episode #214
Parker
- Just got back from vacation
- Have not worked on any projects since last episode
- Watched lots of older James Bond movies
- Should we do a Spy gadget episode if we can get the right guest?
Stephen
- Simulation of the Week: Behringer Model D Oscillator Core
- Lots of cool stuff going on
- Exponential converter
- Constant current capacitor
- Discrete opamp with discrete comparator
- CNC Update
- Base built and topped with a torsion box
- ¾” MDF construction
- Gantry is on but needs some love
- New Spindle has 80mm mount
- This does not fit on my current z axis
- Make a mounting bracket with leftover aluminum from previous project
- Base built and topped with a torsion box
- New transformer for rackmount guitar preamp
- Old configuration was to do a 115:12.6 transformer then feed that into a 12:230 to get back up to high voltage
- Simple math says 230/12 = 19.16 so, 12.6*19.16 = 241.41VRMS = 341.36VDC
- In reality I am getting 250V….
- Hopefully with the new transformer ratio I will get closer to 300V which would be a 20% increase
Rapid Fire Opinion
- Webinar Updates
- Wednesday at 2PM Central
- Link in the show notes to register
- Parker does runs a webinar on March 11th
- Sweat sensor finds stress quickly
- Future of smart watches?
- AutoDesk Eagle sales tactics

Progress being made on Stephen’s CNC rebuild.

Progress being made on Stephen’s CNC rebuild.

Transformers for the rack mount amplifier.
About the Hosts

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 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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