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Circuit Break - A MacroFab Podcast
Circuit Break - A MacroFab Podcast episodes
- EP#344: Fierce Key Inventory
Differential probe design update
- Trying to reduce part count - Want to make it simple
- Decided to go with Caddoc 1776-C681 resistive dividers.
- Used this on the bias test system
- 1:100 divider with high voltage, good tolerance and good thermal performance
- Challenge is to get the dividers to fit
- 3d printed case
Air Filter / Canister
- Turned out great so far will have to see how it holds up under the heat
- Pictures on the blog
Digikey Newsletter
- Check Out Digi-Key’s Stock of Toshiba’s Power Management and Circuit Protection Products
- Email received at 8:25 AM
- Sold out by 9:14 AM
- Toshiba TPH9R00CQH
48 min - MEP EP#343: Bricking Bad
MEP EP#343: Bricking Bad
Bricking Microcontroller - Watch those fuses
- Pic, AVR, STM
- Atmel ATXMEGA16A4U
- AVR studio and microchip studio
- AVRDUDE
Air Filter / Canister
- Long Running Project between Chris Kraft and Parker
- Mods on the red Jeep necessitated moving the original air cleaner
- First design was all 3D printed around 2016 / 2017
- This is right around when 3D printing large objects like this started to get fessable on a hobby printer
- PLA glass fiber
- Worked but the material couldn’t handle the underhood temperatures
- Second design was welded together out of steel
- Material was due to tool and cost constraints
- Working to this day
- Used a filter that is not manufactured anymore
- Third design is a combination of everything Parker has learned about 3d printing
- Polycarbonate seems to hold up in under engine bay temperatures
- Endcaps printed in this material
- Heat set brass inserts for screws
- Aluminum mounting brackets for 3” hoses
- Carbon fiber for the main body
1 hr 1 min - MEP EP#342: Hackery Experts
MEP EP#342: Hackery Experts
HyR0n
- Mathematician
- Computer Scientist
- AND!XOR employee of the month
- Working on badges and things Hackery
Previous Podcast Episodes
- Incognito Mode episode number 69
- Arduino, The Gateway Drug To #BadgeLife episode number 109
- Espress-ify? Designing Products Around the ESP-32 Platform episode number 144
- Feel the Hum episode number 183
- Better Encryption than Zoom, Firmware Stacks episode number 238
- And a couple of the Starwars Specials
DEFCON 30 AND!XOR Badge
- Its a watch, with some watch things, hacker apps (TV B Gone, BLE Interrogator), Games, & Challenge
- Give them away for free at DEF CON following sponsorship from companies and philanthropists.
- Off the shelf device with hacked firmware
- LilyGo T-Watch 2020 V3
- But how did we get there?
- A story of supply chain woes
- Original Watch idea - supply chain issues and crazy costs / quantity buy requirements
- Look at consumer watches we could hack (PineTime, then LilyGo)
- It wasnt just software, a true micropython implementation was done for firmware
- Always interested in python
- We always lived in a C world
- Makes hacking it easier for end user
- Micropython vs Circuit Python
- The Hacking Challenge - BENDER
- Flashing Party - Things you should think about - i.e. Design for Drunk Hacker Production
- You’re going to do the same thing thousands of times, what do we automate?
- Loop script for provisioning
- Push bare minimum over serial, then use wifi to complete
- Turning screen green once flash done and charge at 100%
- Other thoughts?
- Really different than what we do, was really fun
- People like bling more than function, but …
52 min - MEP EP#341: Project Snackey Recap
MEP EP#341: Project Snackey Recap
Project Snackey at Defcon30
- What we did
- CTF
- Codes
- What went wrong
- What went right
- People’s reactions
- Improvements for next year
- Lock Picking Village
- Hardware improvements
- Physical Security
58 min - MEP EP#340: Necrobiotic Synthesizers
MEP EP#340: Necrobiotic Synthesizers
Project Snackey
- See y'all at defcon 30!
Stuff you want to learn about?
- Canbus
- FPGA design
- AWS web development
- Manim - python
My Spider-sense is Tingling
- Spiders are just hydraulic animals
1 hr - MEP EP#339: Educated Compromises
MEP EP#339: Educated Compromises
Project Snackey
- Announcement video lands before this podcast gets released.
Project Diffprobe
- Looking at teardowns of other diff probes
- ADA4817
- 2pA input bias
- -3dB bandwidth of 1050MHz
- Very low input capacitance
- Combine to make an instrument amp
- Perhaps going with an integrated instrument amp
- INA12
- Page 27 of the datasheet - Right-Leg Drive
Hardware subscriptions?
- BWM to offer heated seat subscription
- 18/mo 180/year 300/3year 415/unlimited
- These subscriptions are for “luxury” items in the car, what is next?
- Subscription based displacement?
- Displacement as a Service - DaaS
- Thanks I hate it.
53 min - MEP EP#338: Feature Complete or Minimal Viable Products
MEP EP#338: Feature Complete or Minimal Viable Products
Project DiffProbe
- Landed on the topology Stephen wants
- High voltage dividers
- Compensation capacitors
- CMRR calibration (120dB rejection)
- Offset correction
- Buffers and Instrumentation Amplifiers
- Differential Stage
- 10x and 100x attenuation means offsets have to be bang on
- Opamps (3 of them)
- Buffers
- Low input bias current
- Low offset
- Bandwidth?
- Differential amp
- Low offset. Capable of driving 50 ohm load to the scope
- Gain setting resistors
- Vishay ACAS 0612 - Precision resistor network
- 4x0603 resistors to make a diff amplifier with a gain of 2
- Relative tolerance of 0.05%
- Worst case relative temp-coefficient 15ppm
Project Snackey
- Firmware is “feature complete”
- Display Commands
- How the vending motors actually work
- INA219 Current Sensor
- Interrupts
- Improved method for next revision?
- The one byte Serial Buffer problem
- NEOPIXEL (WS2812) vs APA102 (SK9822)
- Blocking functions
- DMA - Direct memory access
- Importance of full system integration testing
- Timer Lockouts for motors
- Is there a better way?
59 min - MEP EP#337: CSV File Woes
MEP EP#337: CSV File Woes
Project Snackey
- Input Firmware is completed
- Output Firmware is skeltonized/frameworked
- Need to add a “Power Good” signal
- Auxiliary circuits need software resets on power cycling
- Due to how Arduino hardware/software works
The Dangers of Basing your Project on Someone Else’s
- ExtractModel
- Fortran
- No Github
- One CSV file change causes script to break
- Is it really broken?
- What to do?
DIY Meat Smoker Ideas
- ~$1600 for the smoker body “round” part
- Currently 534lbs
JWST sends its first official photos
- Incredible engineering feat
- Had to start with “what do we need to invent” to make this
1 hr 1 min - MEP EP#336: Heirloom Documentation
MEP EP#336: Heirloom Documentation
UtracerV6
- The right way to do instructions
- Full table of contents
- Broken out into sections. The ref designators match the section
- Build
- Test
- At the end is a full calibration section
- Section for logging your calibration values
- A whole section for building enclosures and wiring
- dos4ever.com
Project Snackey
- PCBA completed!
- Smoke monster is still contained within the circuit
- Wrapping up the wiring inside the machine before moving onto code
- Installed a kiosk receipt printer where the coin return used to be and got it working
- Microswitches - The fidget spinner for electrical engineers?
DIY Meat Smoker Ideas?
- Introducing the Low Poly Smoker!
Nvidia could spend $10 billion to secure RTX 4000 components
- Hold there place in line at TSMC?
1 hr 5 min - MEP EP#335: Your Toaster is Toast
MEP EP#335: Your Toaster is Toast
Project: Diff Probe
- Circuit Cellar design
- Hack a Day project
- Active Differential probe with 600V Common mode and 600V differential mode
- Measure virtually any two points. No need for ground reference.
- Perhaps a battery system with a boost converter?
- Excuse to finally use that 3d printer to make a case
- Basically all precision components
UtracerV6 enclosure
- Decided to make an enclosure that better suits my use case
- Stripped down from last time. It does not need all the bells and whistles from last time.
- Fixed sockets
- FTDI and SMPS for 6.3V and 19.5V
EOL: The Chip Shortage You Don’t See Coming
- Instant obsolescence
- No phase-out period
- Foundries are booked three years out
- Suppliers are working on their most profitable lines and filling standing orders
- New fabs coming online won’t be buying old wafer equipment
- New foundries will be making new parts
- Avoiding instant obsolescence
- What parts are more readily available and are continuity coming back into stock
- Look at the market segments using the components you need
- Put out orders for the components that you need regardless of lead times.
Ask and Engineer on MIT website
48 min
About Circuit Break - A MacroFab Podcast
From the publisher's feed
Dive into the electrifying world of electrical engineering with Circuit Break, a MacroFab podcast hosted by Parker Dillmann and Stephen Kraig. This dynamic duo, armed with practical experience and a palpable passion for tech, explores the latest innovations, industry news, and practical challenges in the field. From DIY project hurdles to deep dives with industry experts, Parker and Stephen's real-world insights provide an engaging learning experience that bridges theory and practice for engineers at any stage of their career.
Whether you're a student eager to grasp what the job market seeks, or an engineer keen to stay ahead in the fast-paced tech world, Circuit Break is your go-to. The hosts, alongside a vibrant community of engineers, makers, and leaders, dissect product evolutions, demystify the journey of tech from lab to market, and reverse engineer the processes behind groundbreaking advancements. Their candid discussions not only enlighten but also inspire listeners to explore the limitless possibilities within electrical engineering.
Presented by MacroFab, a leader in electronics manufacturing services, Circuit Break connects listeners directly to the forefront of PCB design, assembly, and innovation. MacroFab's platform exemplifies the seamless integration of design and manufacturing, catering to a broad audience from hobbyists to professionals.
About the hosts: Parker, an expert in Embedded System Design and DSP, and Stephen, an aficionado of audio electronics and brewing tech, bring a wealth of knowledge and a unique perspective to the show. Their backgrounds in engineering and hands-on projects make each episode a blend of expertise, enthusiasm, and practical advice.
Join the conversation and community at our online engineering forum, where we delve deeper into each episode's content, gather your feedback, and explore the topics you're curious about. Subscribe to Circuit Break on your favorite podcast platform and become part of our journey through the fascinating world of electrical engineering.
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