The Amp Hour

By The Amp Hour (Chris Gammell and David L Jones)

The Amp Hour is a weekly conversation about electronics and the people who design them.... more

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How many episodes does The Amp Hour have?

The podcast currently has 745 episodes available.

The Amp Hour episodes:

April 23, 2014Guns and Mobile Labs - Nuanced Nomadic Non-essentials
Dave finally got the poster that Chris sent him. He opened it on his mailbag segment
https://www.youtube.com/watch?v=BXWbmODBvhI
Dave is shopping for a new lab/workspace. He wants to be able to include mechanical elements like a laser cutter and a drill press. The current space isn't well ventilated enough to even use a reflow oven (though he still does sometimes).
Chris started working part time at Supply Frame, the company that owns FindChips.com and Hackaday. Chris will be helping develop new tools for engineers to navigate the supply chain. This is why he's been traveling more and will continue to travel.
Because Session 1B of Contextual Electronics started recently (the building portion), Chris will likely need to build while on the road.
If building on the road, a portable lab will be required. There are some great builds already out there by Ben Heck and across the web.
But what about protecting your stuff while going through security?
Steve Hoefer has written in the past about taking your stuff through as a carry on.
Another option is to be allowed to lock your bag...by packing a gun? Kind of a crazy lifehack, but it works! There are very well defined processes on US airlines for registering and checking a bag with a gun in it.
Dave actually would consider using a tablet based scope (as would Chris) when creating a portable lab. Another benefit is you could use a new simulator with a nice UI called EveryCircuit. It shows current flow and helps people learn circuits.
The Nest production is on hold because waving your arms can shut off the smoke detector without knowing it.
The Fuel Band team was laid off and Nike is getting out of wearable hardware. They won't be the last company to bail on the "hot" market of wearables.
Sick of doing laundry? UC Berkeley is using a PR2 to develop a laundry folding robot.
Chris has been reading The Second Machine Age (and won't stop talking about it). Much of the computing surplus will go towards robotics and human replacement...which will allow us to work on harder problems.
A recent infographic shows the extent to robotic deployment in 2014.
This year the Open Hardware Summit will be in Rome!
Chris will be attending Electronica in Munich Germany. It likely will be a little far for Dave to attend.
If you happened to be at Maker Faire Shenzhen, there was a workshop on how to reball BGA parts by hand!
The workshop was set up by Dangerous Prototypes, who also recently started a service that can layout your boards and get them made for low cost.
Will layout designers be out moded by fancy software? No.
Next week on the show, we'll have LTSpice guru Mike Englehardt. You can ask him questions over on our subreddit.
Thanks to Elizabeth M for the picture of a suitcase
...more
1h 17min
April 16, 2014An Interview With Todd Bailey - Embedded Embrasure Engineering
Welcome, Todd Bailey of Narrat1ve!
Todd grew up with electronics, his dad was an electrical engineer.
He got his degree in English Literature from Oberlin.
A final class there in electronics introduced him to Horowitz and Hill's Art of Electronics.
After school he got a job in a stereo repair shop and was building amps.
He speaks fondly of finding the Jim Williams books. Reminded of the essay "The Importance of Fixing"
When Todd left the repair shop he started designing synthesizers, sequences, switches.
Then he moved onto the PIC microcontroller, taught himself assembly.
He met Dima, now a professor, who offered an interview with a toy company.
The company Big Monster Toys in Chicago. Made over 200 prototypes a year(!).
The ones that made it to production were a power law distribution.
His first design was to design a "Beast in a bag". His mentor, "Big brain Todd" eventually told him a shortcut that helped illuminate how to get things done and move onto the next product (don't listen when the motor is on).
After moving on from the toy company, Todd had a wide range of clients: artists and toy customers.
He started designing products to sell, including a synth kit and a binary display watch.
Then he design "Where The Party At" (WTPA), a synthesizer meant to help people learn electronics.
Todd also talked about the classic Casio SK1 and how it was featured at the Bent circuit bending festival.
Version 2 is on the shelf and ready to get pushed to production, but he is interested in other problems right now, including consulting.
One project he couldn't talk about was a design for robot doors in marine environment.
Todd talked about the experience about doing the engineering for art installations; personal investment in the work seems to be higher for art.
Nam June Paik didn't design the TV Synthesizer specifically, he designed the art around the technology.
A more recent personal project has been the Vec9, built on a vector screen from an Asteroids cabinet. It's unique because the Asteroids controller draws with vectors instead of rasters (like on VGA televisions).
https://www.youtube.com/watch?v=lEkPHPiHuio
Andrew Reitano worked on the FPGA stuff, you can read more about it on his site Batsly Adams
For the past few years you could find Todd at the Analog Aficionados dinner, thrown by Paul Rako. Chris hopes to be out there next year.
Todd's image of himself is as an engineer, if someone proved him otherwise, he'd be shaken.
Other fun projects recently:
A motor driven flying bed that allows extra space in his apartment.
A video synthesizer that he showed off at Maker Faire NY
You can reach Todd online at his site Narrat1ve.com or on Twitter by tweeting @ToddBailey. Thanks to Todd for coming on to share his stories!
...more
1h 31min
April 09, 2014We're Sorry! But Apple Ain't! - Remorseless RAM Racketeering
Yes, it's true, episode 192 (last week) was a lame attempt at an April Fool's joke. This could have been caught if you noticed the mention of Touchstone starting up. Dave also did an April Fool's video, but released it early in order to increase trickery!
https://www.youtube.com/watch?v=iFyEqcVpKLI
Adam Carolla is taking the fight to the patent trolls! You can support the fight too by participating in their fundraising campaign.
Chris got a Sparkfun meter (contraband!) at his local Microcenter.
Bunnie gave a talk at EELive about OSHW and the slowing of Moore's law.
He also showed the newest prototype of his open source laptop. You can join in and buy your own through the crowdfunding campaign.
Dave doesn't think he'd ever buy one because he could get low cost hardware for a PC, but Chris pointed out the software ecosystem you're really buying.
All of the software is available on GitHub under Xobs (Bunnie's co founder) account.
The laptop has a built in Spartan 6 FPGA
The newly announced Saleae logic analyzer and scope family was just announced! They have 4 different flavors, the lowest being $99. Too late for Contextual Electronics, they'll be using the Gabotronics Xminilab instead.
Chris didn't like that they are crowdfunding a product that very obviously will be released regardless.
Sometimes you don't get a large variety of component choice when you're inside a niche industry. Dave used to find and report silicon bugs to manufacturers when he was working with leading edge analog to digital converters (explained on our episode about buoys!).
Advertising at tradeshows is extreme, Chris questions if this is why he has to pay more for products.
Apple is working to buy a dominant stake in Renesas. Their supply chain needs and excess cash has them taking risks like buying companies with huge losses ($6B+ in the past few years) in order to have first shot at the silicon.
Buying lots of chips at once basically allows cash-heavy companies to act like mafias ("leaning" on their suppliers).
The Raspberry Pi foundation just released a new "Compute" module based on a SO-DIMM form factor. Dave mentions that these were used in the past and had a standard associated with them, the embedded open modular architecture.
Yet another BS indiegogo, this one creeping past $1million dollars (and still going) that can claim to track your calories through skin resistance. NOPE.
A high-flying crowdfund campaign that isn't BS is the MicroView, which crossed the $500K threshold. Marcus was on the show a few weeks back talking about the device.
Chris did a booth mini Maker Faire. It's amazing that some people do this for conferences as large as Bay Area Maker Faire (which Chris will be attending as a participant, not a presenter).
This year there will be a "Gauntlet" that runs for 1.5 weeks: MakerCon -> Maker Faire -> SolidCon.
Thanks to Wikipedia for the image of Al Capone and to Apple for not suing us (...right?)
...more
1h 15min
April 01, 2014Chairs, Sparks and Devices - Optional Olent Obreption
This week focused more on electronics! Think we talk about something too much or too little? Let us know in the comments!
Chris finally got a chair and wowsa does it make a difference!
Finding parts online can be tough with distractions, apparently extended internet use can affect the brain. What's a datasheet hunter to do?
If you're still a USENET junkie, Dave is on the sci.electronics.design (accessible through Google Groups).
Shoutout to Junko Yoshida for some of the great articles she writes. Really enjoyed the piece on "The Land of the Rising Silence" when she visited Japan.
Students in the US can get Amazon Prime for a year (Chris got 1-night shipped his chair for $4). Dave dislikes how they won't ship anything but books to Oz.
Dave has been looking for the lowest power 16+ bit A/D converter he could find. All told he found 2412 from over 24 different companies. Crazy!
COTW: The AD7691 from Analog Devices. 18 bits and only 108uW @ 8kHz. Wowsa!
Speaking of low power, our friends from Touchstone Semi have been getting some press from their initial announcements. They're 2nd sourcing components from Maxim IC...hopefully without any issues.
Design Spark has a new plugin for their free CAD software that allows 3D models (incorporated in version 2) to be exported to Google Sketchup. Cool!
With the CADspan plugin for Google Sketchup and 3D printing, it's conceivably possible to make an entire prototype for <$100.
Dave looking for preferences on CAD packages for future OSHW projects. Your opinion?
Have there been any large-scale open source hardware projects? Chris and Dave can't think of any.
Obama announces robot initiative. Only $70 million but the idea is great. Won't be creating jobs anytime soon though!
This Day in Nerd History:
June 26th (oops!) -- Maurice Wilkes was born. Founding father of many microcomputing principles and techniques (in the '40s, no less!)
June 27th -- The inaugural run of the first U.S. passenger train to use electric locomotives.
June 28th -- Milan, Italy inaugurated the first central European electricity power station.
Lightning Round:
Company gets approval to store your Facebook data for future employers to look at. Yipes!
The patent system in the US gets approval in the house. If signed into law, it'd be "First to file" instead of "First to invent'.
That's all for this week. Be sure to leave us some comments and find us on Twitter or Facebook!
...more
1h 7min
March 26, 2014Let's Hear It For The Buoys - Vanishing Vessel Vexation
Chris has been having trouble getting into a work grove while on his own. Dave "told him so". Chris is now trying out Evernote.
The "Screen Snip" function of Evernote is similar to the recently released Datasheet.net.
The MH370 tragedy is also quite an intriguing mystery. Freescale had many employees on the plane.
Former guest of the show Greg Charvat has been on all manner of TV programs explaining the radar systems used for search.
Recently they figured out that they could use the doppler shift of the signals being sent out from the plane to help locate the flight path. This has never been done before.
Dave's former project, the Sonobuoy, is likely being used to help pick up the sonar signal.
As discussed when Elecia was on the show, Dave's firmware decides to scuttles the buoy (sink it to the bottom of the ocean) after a certain timeout period.
An Aussie researcher used Sonobuoys dropped in a relatively close location in the Indian Ocean to see how far the currents drift...the answer? Quite far.
Chris referred to the EAC, which was talked about in Finding Nemo.
Chris will be attending EElive next week. Will you be there? Former guests Elecia White, Bunnie Huang and Jack Ganssle will all be speaking at the conference.
The Computer History museum is NOT next to the McEnery Convention Center, it's in Mountain View. It's the "Tech Museum of Innovation" in downtown SJC.
Sparkfun got dinged for importing yellow multimeters. This apparently violated Fluke's "Trade Dress" in the US (not to be confused with Trademark).
The Fluke response was nice, but predictable.
Chris has been stressing about finding a sub-$100 oscilloscope (even if it's a "throw away") for Contextual Electronics Session 1B. It needs to be available worldwide and a standard product (ie. no recommending an analog scope). Right now he's looking at:
DSO Nano v3
Hantek 6022
Are there others he should be evaluating?
Dave started with a Kikasui 20 MHz scope that he paid $800
Do you feel imposter syndrome? This is a rising trend in the software industry, we were curious is the same happens in hardware. It's easy to feel inadequate with so many people making YouTube videos and submitting stuff to Hackaday.
What do you use for your bare metal ARM toolchain? Alvaro writes about his GCC based approach.
A nice article about how short term thinking and the finance/bean counters gutted manufacturing in places like the US and Australia.
Does Silicon Valley have a youth problem? Depends which side of industry you're in.
Dave and Chris both wonder where hardware startups are headed. How many connected devices can a person handle?
Dave made an in depth video about power supply ripple
https://www.youtube.com/watch?v=Edel3eduRj4
Thanks to Mike Baird for the picture of the buoy.
...more
1h 21min
March 19, 2014An Interview with Marcus Schappi - Kit Ketch Kenophobia
Welcome, Marcus Schappi!
Marcus and Maddy Schappi started Geek Ammo and are producing the MicroView as a Kickstarter (but only 5000 of them).
They also own and run Little Bird Electronics, the largest Australian distributor of Open Source Hardware.
Marcus does customer support and is tempted by "Let Me Google That For You" -- http://lmgtfy.com
They run the business out of their house! Which is even crazier when you realize they carry more than 10,000 SKUs (Stock keeping units)
Prior to the latest Kickstarter venture, they started Ninja Blocks. It's based upon the BeagleBone (original) and raised more than $100K.
The idea behind NB was to act similar to IFTTT.com ("If this, then that"), but for hardware/real world interactions.
They were able to run this campaign on Kickstarter before it came to Australia by incorporating in Delaware as a US company.
They were assisted and supported by StartMate, a resource for Aussie companies.
At first, the idea of an Arduino with a built in display was an off-hand joke. However, they wanted it to be real (like Chris wanted with the Tacocopter).
Early protos were done with the $4K pick and place from Shenzhen.
The MicroView will also have an interactive course for iPad. There are 11 modules to get people started.
When submitting the project to Kickstarter, they didn't believe the picture was a prototype because it was so shiny. In fact it was a machined and polished CNC.
Cases are a difficult problem to solve; with the Ninja blocks, they 3D printed each and every case (more than 1000!). They did this inside the Little Bird house and Marcus's child may be as much as 10% ABS plastic because of it.
Marcus is no longer involved in the day-to-day operations of Ninja Blocks. They did a $1m investment round and recently launched the very shiny Ninja Sphere on Kickstarter.
The MicroView will be manufactured by Sparkfun. The engineering team was our guest a few months back and it's easy to see why such a talented team is growing into such a powerhouse company!
Sparkfun also produced the Makey Makey, a popular MIDI interface tool based on the Arduino.
Marcus was able to convince Nate by making an analogy to the AMG/Mercedes Benz relationship.
Arduino is now incorporated in Switzerland (the Delaware of Europe!)
The MicroView is participating in the "Arduino at Heart" program, a quasi-licensing/approval that alerts users that the guts of a device are hackable.
It's about creating products that "just work". Marcus likes the Electric Imp, which gives users wifi inside an SD card.
What did Marcus learn from the online game Clicking Bad? Distributor networks really matter! And Sparkfun has a LARGE network.
Apparently 30% of Kickstarter backers are outside the US. At least for Marcus and Dave's campaign.
Sparkfun are outpacing their competitors. Marcus and Dave wonder if anyone would/could buy them?
Thanks so much to Marcus for "debuting" his Kickstarter project on The Amp Hour! As of the posting of the show, the campaign already crossed the $45K mark! Jeesh, so much for a "debut"!
...more
1h 24min
March 12, 2014Capacitors, Simulation and Closures - Deonerated Design Dealmaking
Chris is currently in Florida, a somewhat crazy state. Don't believe him? Check out this "gameshow" called "Fake or Florida":
http://www.youtube.com/watch?v=ZG5EdFAy3FI
Dave is busy testing the boards from his Kickstarter. He still has more than 1500 for the assembly house to test!
http://www.youtube.com/watch?v=UESc7ms4efo
This is also why Dave has been developing a precision current source.
People have asked why he isn't using a flying probe machine? The overhead is too high for low number of pass/fail tests.
Dave likes controlling a lot of aspects of the operation, including shipping, because he is able to optimize.
Chris decided to optimize for time by offloading the shipping of PCBs for Contextual Electronics.
Do you panelize boards? Here is another great resource about how and why to do it.
Can anyone compete if they're not using some component of "Free" these days?
Touchstone Semiconductor seems to be shut down; Silicon Laboratories bought their IP for $1.5 million.
They're not alone, Radio Shack is closing up 1,100 stores as they figure out their business model is crap.
Dave saw the same thing happen when Dick Smith sold to Woolworth's.
Analog Devices also decided to close up a tiny bit of their shop; they will no longer offer an ADI branded version of MultiSim (the simulator from National Instruments). Dave points out there may be SPICE based tools in the future.
Many vendors buy their tools from third parties; LT Spice was formerly switcherCAD. We'll have Mike Engelhardt on the show in April!
TI (formerly National Semi) WebBench adds schematic modification and simulation. This might finally make the tool useable!
Another entrant into the fray (and one that has yet to prove its usefulness) is Schematics.com
One thing that WILL be working is former guest Adam Wolf taking on the nightly builds of KiCad for OSX!
Chris spills his idea that someone should start a Red Hat for KiCad; basically a company dedicated to serving corporate customers with supported open source tools. Then feed the enhancements back to the community like Red Hat does with CentOS.
Dave wants to call it "Tinfoil Hat" or alternately "Copperclad Hat".
Cereamic capacitors can fail...and 80% of the time it's from the mechanical assembly of the boards they're on.
This can cause capacitors to "sing". Dave used to do this purposefully when building ceramic hydrophone elements.
Speakers can be microphones and microphones can be speakers. Chris enjoyed Innovation Hub talking about how the Beatles did this for "Paperback Writer" Daytripper.
Ceramics aren't always the answer! Sometimes you need a minimum esr for switching regulators.
Sometimes other capacitive elements can be sensitive. Former guest of the show Mike Harrison (Mike's Electric Stuff) showed how PIC microcontrollers are pressure sensitive!
http://www.youtube.com/watch?v=UCXCLR3xq8U
There are now 50 Billion ARM devices in the world! Dave doesn't think that is susprising, but Chris does giving that it's mostly recent growth (since the iPhone) that things really exploded.
Thanks to Scott Kellum for the Florida picture
...more
1h 13min
March 05, 2014An Interview with Elecia White - Wirewove Worshipping Wookieist?
Welcome, Elecia White of Logical Elegance and the Making Embedded Systems podcast (and book)!
Elecia's wonderful book is called "Making Embedded Systems" and is published by O'Reilly. You can get a discount by going to this site and using the code 'authd'
The notebooks discussed are the SNCO 2001
Her career so far has taken her to the depths of management and back. She was a full time manager at Shotspotter.
Dave loves it when his reputation precedes him to an interview (shocker!), Elecia doesn't.
Want to get into embedded? Start with Arduino.
Elecia sees lots of projects using the Cortex-M3, was surprised the Cortex-M0 didn't do better.
Unless a software stack is required (ethernet, bluetooth), Elecia doesn't like RTOS's because they often still don't run fast enough (or aren't deterministic enough).
She has worked wit the c2000/Piccolo family and likes it for math heavy operations because of the DSP.
The compilers aren't getting any less expensive...or better. She prefers the GUI of Visual Studio but no embedded IDEs seem to have the same functionality.
Power optimization is a challenging/fun part of Elecia's jobs as well.
She worked on some of the Fitbit devices out in the market today (one, flex, force).
Also some of the toy lines at LeapFrog, such as the Violet.
A common frustration among embedded engineers is when people expect embedded systems to be like their iPhones.
Self commenting code is something to strive for, but is unrealistic.
Elecia believes commented out code snippets should be deleted (and tracked by revision control).
"If code is the main meeting that is happening, comments are the backchatter that happens between engineers over IM"
She doesn't dislike Git, the processing being used when she first started with it was poor.
El likes touch feedback and sees haptics as a new area for innovation, especially for VR/AR.
Writing a book is tough...she did it 3-5 hours a day for 6 months...while consulting!
Making Embedded Systems was similar to the O'Reilly Head First series.
Going to be at the EE Live event in April? You can go watch Elecia do a teardown and give a talk about IoT being disappointing.
Elecia and Christopher have a Nest Thermostat and a Smoke Detector and they aren't quite living up to expectations. At least not $3.2B expectations from the consumer perspective.
It was great to have Elecia come tell us more about the embedded world and about her vast experience in the field! Be sure to check out her podcast and all of the wonderful guests and banter on the show!
Added extra, which Dave thinks is hilarious: The Choke-A-Chicken Novelty Toy.
...more
1h 43min
February 26, 2014Someone is watching...we think - Horme Hostility Hypochondriac
Chris is in Pasedena. Want to meet up? Keep an eye on the @Hackaday twitter feed.
Dave is pissed about the US gov't affecting his purchase outside the US.
Chris likens this to how China handles the internet...you want access to their market? Play by their rules.
There still is a chance that BTTF shoes are a reality.
CE is going well, moving into week 6!
Dave was supposed to get a 6-in-1 scope from Tek but its stuck in Customs.
Aside from getting scopes, Dave also recently was selling scopes at the Wyong Field Day. He got between 30 and 280 for a TDS220 scope.
http://www.youtube.com/watch?v=1yAx1Etr1Gc
Chris is perturbed by the shortage of BeagleBone Blacks.
More discussion about the shades of gray in OSHW.
Do you pick parts based on available libraries? Which types of parts?
DARPA is hoping to fund the development of chip that can prove authenticity overseas.
Dave is now a mailing house! Surprisingly, the cost to send something to Australia and outside Australia are simiar.
Chris wants a feature length film about the Traitorous 8. Maybe we should start a Kickstarter?
There was a silly KS project about how to succeed at KS...that did not fund...
More links!
A great teardown over at the EEVblog forum: A Keithley 2002
Google recently released Project Tango
Supply Frame/Hackaday just launched the "Projects" site to share your work with others easily.
Thanks to Jackie Sutherland for the picture of the creeper cat
...more
1h 12min
February 19, 2014An Interview with Hank Zumbahlen - Zoppa Zumbahlen Zateticism
Welcome, Hank Zumbahlen!
Hank graduated from University of Illinois in 1974
He then worked at National Semi 2 months before there was a huge layoff. Other companies followed with similar fates, due to the timing of the job market.
He has been at Analog Devices for 25 years now! Awesome!
He started in field applications but now works in central applications, developing writings and seminars.
The most famous of which is the Linear Circuit Design Handbook, one of the best (free!) resources available online for analog. Hank was the editor and there were other contributors as well. They called the book, "the seminar that never was".
Another great (free!) resource is the ADI's "Op Amp Application Handbook", Walt Jung, Editor.
Hank works out of the San Jose office and his home office, but also travels around to train people. He'll let us know when he's doing his next public seminar.
Yet another awesome resource (and something that got integrated into the Linear Circuit Design Handbook) is an app note called, "Staying well grounded"
Both that article and an article by Henry Ott about split ground planes (Henry was a former guest of the show) helped Chris get through many design problems.
Hank suggests to "Think like an electron".
While working on a particularly difficult verification circuit, Hank had to build a 3500W linear amplifier(!!).
Hank puts the "Low vs High Frequency" division at about 10MHz-100MHz. Basically when you need to start worrying about EMI.
Integration continues to increase in analog components. Chris recalls the ADuCM350 discussed last week.
In order to keep advancing technology, we need more package changes. Really this means we need to be able to access I/O on silicon.
Hank maintains his audio hobby, including his work as a musician. He built an outboard DAC with a "ludacris fringe" -- a 7 pole filter for the DAC output. Wowza!
The precursor to Hank's "Staying Well Grounded" was Paul Brokaw's AN202, "Making things go right for a change"
Many people don't understand the mechanical to electrical conversion process, as in an accelerometer. Hank says they measure zeptofarads.
When looking at ADCs, some look at SNR and some look at ENOB.
Hank doesn't work much with IBIS because he stays in the relatively low frequency realm.
The newere tech is "evolutionary vs revolutionary". But that means consumers will get more for less (and faster!). Chris likes the isolators like the ADUM2401.
PLLs are getting faster too...now running around 18 GHz!
Hank's next series of articles will be about phase response filters.
This will appaear in the Analog Dialogue, an awesome newsletter about all things analog (a little bit of marketing, but its bearable). There are also very valuable archives.
If you'd like to reach Hank, you can email him at [email protected]
Thanks so much to Hank for talking to us on the show this week. It's always great to get analog gurus with their war stories on the show! Also, thanks to Michael Ossmann (@michaelossmann) for joining us again!
...more
1h 24min

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How many episodes does The Amp Hour have?

The podcast currently has 745 episodes available.

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