A (mostly un-cohosted) podcast where we talk about progress - or lack thereof - of hobby-projects, mostly related to software, electronics or mechanical engineering.
info_outline episode 44: DMX512, ground reference and LED decoration stuff 01/17/2021
episode 44: DMX512, ground reference and LED decoration stuff Hi, and an extremely good 2021 to all of you.
info_outline episode 43: DMM probes, laundry fix and light-hangout 11/01/2020
episode 43: DMM probes, laundry fix and light-hangout Prepare yourself for epic or less epic talk about a mains test jig that proved very useful, some awesome Probe Master DMM probes well worth the money, and both me and occasional cohost Domen fixing household stuff, and the subtle psychology of starting a repair.
info_outline episode 42: exploding cap, 3D-printing and planet decoration 08/12/2020
episode 42: exploding cap, 3D-printing and planet decoration The thrilling tale of 4 months of doing pretty much nothing interesting is coming to a podcast near you today!
info_outline episode 41: oversized test-jig, spiky LED ball and knowing your equipment 04/12/2020
episode 41: oversized test-jig, spiky LED ball and knowing your equipment In this time of global turmoil, the CBA Podcast once again proves to be your one-stop source of distraction and meh-grade information.
info_outline episode 40: xmas smoothness, deadlifts and resistive load 03/05/2020
episode 40: xmas smoothness, deadlifts and resistive load Welcome to the first and so far best episode of 2020, the third year of this podcast. Thanks for sticking around and making this happen, or alternatively, thanks for just tuning in - hope you like it.
info_outline episode 39: crossing borders, intensity curves and anti-theft socks 11/11/2019
episode 39: crossing borders, intensity curves and anti-theft socks Another mixed bag as usual. 2 meetups with the CBA Quality Team for some Quality Time.
info_outline episode 38: LEDstrip fun, rand, and voltage drops 06/24/2019
episode 38: LEDstrip fun, rand, and voltage drops Hi there! Thanks for tuning in (or reading this text and then deciding not to tune in at all). Another episode with a mixed bag of semi-interesting topics. Thanks for the feedback - the inter-segment jingle will be a bit less loud from now on. Poor ears. We start off by counting pass & fail on this year's new year's resolutions, followed by mentioning a small inline PCB for driving LED-strips and so on. The PCB was used for 2 light effects so far - links to videos of both are given below. Ran into a "gotcha" when dealing with LED-effects: intelligent LEDs stuck in "full brightness" mode, causing the supply to shit itself and the system to become unresponsive. (Quickfix: small delay between boot and start-of-effect at power-on.) For the LED-effects, I measured rand() execution times (avr-gcc, avr-libc, ATmega168 @ 8 MHz) and was pleasantly surprised by its speed and predictability. Will use again. Finally, some fuzzy guesstimates / measurements about what kind of voltage drop to expect when running current through long cables. Relevant links: ...and one of a on 28 & 29 September. Applications run (for now) until 31 July. Snapshot of my inline PCB:
info_outline episode 37: past events, lasercutting and fear of breaking the rope 06/04/2019
episode 37: past events, lasercutting and fear of breaking the rope You thought that we finally learned from our mistakes and abandoned this podcast, and you thought wrong. Once again it's time to lower your standards, and enjoy a new episode of the CBA Podcast. We start with some PCB failures and flaws, followed by a very brief review of the Hackalot lasercutter & vinylcutter workshop. We attended T-DOSE, which is a Dutch open source event hosted in Eindhoven. Then for something slightly out of the ordinary, we talk about back-of-envelope calculations about whether a climbing-rope can actually break if I fall. (Spoiler alert: it cannot.) Some clarifications and errata about this climbing-rope segment: To calculate maximum force on the rope, I used the harmonic oscillator formula given , where the actual force is calculated from fall factor, mass of object, but also the rope's rated impact force. (I forgot to mention that). Also, I made an error: I mentioned a maximum actual force of approximately 85% the rope's rated impact force, but this is in fact less than 70% - nice. For those special people who like this: standard EN 892 deals with dynamic ropes like the one discussed, and EN12277 deals with harnesses ("belts"). My harness is tested with a sustained load of 15 kN. The type of carabiner I use is rated for 27 kN load. Finally, some relevant links: (Eindhoven, NL) where a and live Open Source Software event (Eindhoven, NL) Wikipedia: and indoor sportclimbing (Eindhoven, NL)
info_outline episode 36: triple screw-up, LED lamp biopsy and bodyfat measurement 04/29/2019
episode 36: triple screw-up, LED lamp biopsy and bodyfat measurement After more than 1 month of laziness, let's kickstart this episode with some failures and apologies. Next up is a summary of Hackalot's part in the Open Hackerspace Day 2019, and a teardown of a cheap and somewhat boring Aldi 230 Vac LED lamp. Finally, some very-voodoo and somewhat-less-voodoo methods of measuring the percentage of bodyfat in humans are briefly discussed.
info_outline episode 35: home sensors, disco LED hack and airplanes 03/22/2019
episode 35: home sensors, disco LED hack and airplanes After 5 weeks or so, we're finally back! You'd think that means this episode is filled with 5 weeks worth of exciting techie stuff, but don't get your hopes up yet. Because it's not.
info_outline episode 34: Rust, coroutines and cohosting 02/13/2019
episode 34: Rust, coroutines and cohosting Finally, the "we" in announcements doesn't just mean the royal we / majestic plural, but there's an actual co-host! Introduction is in the audio contents, so I guess you'll just have to listen.
info_outline episode 33: new year's resolutions, SD-card interfacing and programming-meeting 01/20/2019
episode 33: new year's resolutions, SD-card interfacing and programming-meeting HNY2019! Not a whole lot of stuff to talk about, so this is quite a short episode.
info_outline episode 32: a lying oscilloscope, TV repair attitude and VGA generation 12/10/2018
episode 32: a lying oscilloscope, TV repair attitude and VGA generation This episode discusses ongoing PCB failures, oscilloscope overdrive recovery, a BT-enabled headphone that would just keep connecting, some local events (GLOW, Awesome Space repair day, and the HCC Retro quarterly meeting). Finally, an experiment gone out of control resulted in a small PCB for generating colour effects for 4 connected VGA monitors. Ruby is used as "effect description language".
info_outline episode 31: one year anniversary, RC2018/09 results, FPGA and Forth 11/02/2018
episode 31: one year anniversary, RC2018/09 results, FPGA and Forth Yay, after one year we're still polluting the virtual airwaves, so let's review the last year of podcasting (only takes about 8 minutes - don't cry).
info_outline episode 30: social stuff, Ruby and a USB logic analyser 10/10/2018
episode 30: social stuff, Ruby and a USB logic analyser Lots of little topics this time, woven together by clever commentary. That's CBA Podcast for you. In the spotlight this time: a shout-out to the Quality Team behind this podcast, impressions from the recent Eindhoven Maker Faire, HCC Retro and Bonami Homecomputer visits, a look back at the current (finished?) RetroChallenge, how to learn Ruby, a DIY portable voltage-reference, the Open Bench Logic Sniffer USB logic analyser, and fun with my angle grinder.
info_outline episode 29: feedback, cleaning PCBs, scripting again 09/21/2018
episode 29: feedback, cleaning PCBs, scripting again You can, of course, send feedback to the show using the email-adress listed at the top of the page. Today's episode briefly touches on PCB-cleaning, meta- and actual work for the RetroChallenge 2018/09, scripting-languages (again - a never-ending story), and upcoming local events.
info_outline episode 28: EMFcamp review, mini-CPU and more PCB-fail 09/06/2018
episode 28: EMFcamp review, mini-CPU and more PCB-fail Just back from the ElectroMagnetic Fields (EMF) camp in the UK, so there's a little review of that. Furthermore, we talk about a LED-strip decoration, badge-sized mini-version of an 1-bit CPU, PCB-failures (and successes!), the upcoming RetroChallenge and my entry for that, and 2 small talks I can now get nervous about.
info_outline episode 27: new TS100-tip, MP3-player innards and controlling a WS2811 LED-strip 08/18/2018
episode 27: new TS100-tip, MP3-player innards and controlling a WS2811 LED-strip Recorded from my cellphone + external mic this time, so feedback w.r.t. sound-quality (or anything else!) is welcome, as usual.
info_outline episode 26: DIN-rail prototyping, coffee-machine revisited and another zap 07/29/2018
episode 26: DIN-rail prototyping, coffee-machine revisited and another zap To counter the evil midsummer heat, we bring you another cool and refreshing episode. Topics include a 45 Vdc SMD LED, DIN-rail prototyping, reconsidering the workings of a previously disassembled coffee-machine, getting zapped by a vintage coffee-grinder, and an unused yet brand new angle-grinder.
info_outline episode 25: zapped by cap, maze-generation and counting steps 07/05/2018
episode 25: zapped by cap, maze-generation and counting steps This time, we explore the wonderful world of being zapped by a high(ish) voltage electrolytic cap, some maze-generation algorithms in a nutshell, disassembling a simple step-counter, and starting a scootmobile with a magnet-key.
info_outline episode 24: laundry-machine valve, engraving PCBs, and DPS5005 enclosure 06/16/2018
episode 24: laundry-machine valve, engraving PCBs, and DPS5005 enclosure No idea how this episode got so long... Featured(tm): reselling my HP3455A DMM to the person I bought it from, a meeting of the HCC computer-club (.nl) Retro-section, reverse-engineering a overflow-valve for a laundry-machine, making quick electronics-prototypes by manually engraving copper-clad PCB, and making an enclosure for the DPS5005 power-supply module.
info_outline episode 23: sounding dumb, TS100 and bootloaderless programming 05/26/2018
episode 23: sounding dumb, TS100 and bootloaderless programming Quite a long episode this time - hope it doesn't bore you too much. Topics include the ability to ask silly questions and do silly things, sharing a serial link to an AVR between programming and debugging without bootloader, the portable TS100 soldering-iron, interesting game-console candidates, and past and upcoming events.
info_outline episode 22: software-development on retro-computers, toaster-disassembly and workshop-equipment usefulness 05/11/2018
episode 22: software-development on retro-computers, toaster-disassembly and workshop-equipment usefulness This episode talks about what happened to my RetroChallenge RC2018/04 project, software-development for yesterday's computers, the last Hackalot-meeting, components with crappy documentation, disassembling a toaster with actual electronics inside, and the usefulness of various engineering-tools found in my workplace.
info_outline episode 21: finishing up RC2018/04, scripting, and finding a new home-computer 04/28/2018
episode 21: finishing up RC2018/04, scripting, and finding a new home-computer This episode wraps up my (hobby)work for the RetroChallenge 2018/04, and talks about a favourite scripting-language or the lack thereof, the use of SD-cards, finding a new pet (or PET..?) homecomputer/console, and NE555-sound.
info_outline episode 20: vintage AC PSU, RetroChallenge and disassembling a coffee-machine 04/15/2018
episode 20: vintage AC PSU, RetroChallenge and disassembling a coffee-machine Made it to episode 20, and it's still a lot of fun - I hope the feeling is mutual. :-)
info_outline episode 19: hand-held scopes, disassembling scales, and a digital probe 04/08/2018
episode 19: hand-held scopes, disassembling scales, and a digital probe Topics this time are my effort so far for the RetroChallenge 2018/04 (25% in), a short and biased discussion of some available handheld oscilloscopes, disassembling consumer-scales to see what was going on inside, hacking together a small digital probe to distinguish high/low/floating pins, and blowing a fuse while poking at electronics.
info_outline episode 18: low-current LED, IFComp-effort and toaster-autopsy 03/31/2018
episode 18: low-current LED, IFComp-effort and toaster-autopsy This episode covers one more PCB-failure (see previous episode for more fail), a LED that would still emit light at a rediculously low current, shortcomings of DIY lasercut stencils from a previous episode, my entry for the upcoming IFComp, disassembly of an old bread-toaster, the RC2018/04 Retro Challenge which will start tomorrow, and some more upcoming events.
info_outline episode 17: connecting stuff, PCB-failure countdown and fixing a microphone/headphone 03/17/2018
episode 17: connecting stuff, PCB-failure countdown and fixing a microphone/headphone Only a short time between the last episode and this one, so I didn't do a whole lot of stuff: spent 1 day volunteering at a local Home Computer Museum, decided on a project for the upcoming Retro Challenge 2018/04, went through all PCB-design I've ever made and made a list of common failures, and fixed a headphone with built-in microphone (that is, removed the microphone-part).
info_outline episode 16: Maker Faire project (again), upcoming stuff and Maker Faires in general 03/12/2018
episode 16: Maker Faire project (again), upcoming stuff and Maker Faires in general Maker Faire Ruhr (Dortmund, .de) came and went, so this is the last time you'll hear about my project for that - finally. Apart from that, this episode is about hot air soldering and upcoming events, local and remote, on- and offline.
info_outline episode 15: quickfixing/ignoring weird electrical problems and working on my CPU-project 02/25/2018
episode 15: quickfixing/ignoring weird electrical problems and working on my CPU-project Not much diversity this time - just doing my best to get ready for Maker Faire Ruhr (Dortmund) on March 10-11.