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MacroFab Engineering Podcast

MacroFab, INC.

3
Followers
2
Plays
MacroFab Engineering Podcast

MacroFab Engineering Podcast

MacroFab, INC.

3
Followers
2
Plays
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About Us

MacroFab's Engineering Podcast! Where Electrical Engineers, Parker Dillmann and Stephen Kraig talk about electrical engineering topics, DIY projects, and industry news. Sometimes cool people stop by the podcast to drop some knowledge.

Latest Episodes

To Bake an Apple Pie

MEP EP#247: To Bake an Apple PieParker PCB Stackup Why is it important to manufacturing? Who should define it? CM? PCB Fabricator? Designer? PCB Bodges Your worst bodge Most proud bodge? DIY Glycol chilling? Chiller Daddy Pump Diverter Stephen Brexit and the UKCA Mark New regulatory mark to make things easier… Goes into affect 1 January 2021 The UKCA marking can be used from 1 January 2021. However, to allow businesses time to adjust to the new requirements, you will still be able to use the CE marking until 1 January 2022 in most cases. The UKCA marking alone cannot be used for goods placed on the Northern Ireland market, which require the CE marking or UK(NI) marking.

53 min4 d ago
Comments
To Bake an Apple Pie

Doing Something Magical

MEP EP#246: Doing Something MagicalParker Physicists build circuit that generates clean, limitless power from graphene University of Arkansas physicists Energy harvesting the thermal motion of graphene Without getting all quantum about it, it seems to work by configuring the graphene as one electrode (or both) of a capacitor. As the graphene flaps in the breeze (actually Brownian motion, I assume), the changing geometry will change the capacitance. The team's next objective is to determine if the DC current can be stored in a capacitor for later use Youtube video Stephen New test equipment design - picking the right opamp Current sensing with a bit of a twist Powered by +/-12V Need to read current on the +12 and the -12 along with a +9V rail Opamp needs to be capable of reading a voltage drop in an environment where the common mode voltage is at or near the opamp supply voltage Current sense amplifiers INA1x9 series amplifiers from TI Supply and common mode range are independent of ...

41 min1 w ago
Comments
Doing Something Magical

K-Factoring a Gumbo

MEP EP#245: K-Factoring a GumboParker Security flaw left ‘smart’ chastity sex toy users at risk of permanent lock-in List to podcast for additional information... Stephen Fusion 360 has changed their personal license subscription model All of these went into effect on Oct 1 Project storage is limited to 10 active and editable documents Exports are now limited to a small number of file types. Thankfully this still includes STL files but alas, DXF, DWG, PDF exports are all gone Perhaps most importantly to the makerverse, STEP, SAT, and IGES file types can no longer be exported, the most common files for those who want to edit a design using different software. 2D drawings can now only be single sheet, and can only be printed or plotted Rendering can now only be done locally, so leveraging cloud-based rendering is no longer possible CAM support has been drastically cut back: no more multi-axis milling, probing, automatic tool changes, or rapid feeds, but support for 2, 2.5, and 3 axi...

44 min2 w ago
Comments
K-Factoring a Gumbo

Comic-Con for Engineers - Chris Carter

MEP EP#244: Comic-Con for Engineers - Chris CarterChris Carter The owner of Mercury Inc. Mercury Inc. is a design consulting firm with expertise in electrical mechanical software and firmware development DFM for PCB Assemblies Industrial Design What is this? Special Assembly Unique processes Sequences and events Design for Serviceability Documentation Change logs

53 min3 w ago
Comments
Comic-Con for Engineers - Chris Carter

Schematics and Connectors, Name a More Iconic Duo...

MEP EP#243: Schematics and Connectors, Name a More Iconic Duo...Parker Battery Charger debacle update Two batteries recovered, One failed Amazon Sidewalk draws electronics from among TI, Silicon Labs and Semtech Amazon Sidewalk, a new shared wireless network for IoT consumer device DXF to Board outlines? Eagles DXF importer doesn’t work all too well Suggestions? AutoDesk Fusion seems to import just fine Stephen Connectors on schematics Rfdave on slack channel asked a question about this Am I the only person who hates a schematic consisting of 1 connector, 2 IC’s, 4 bypass caps with all of the interconnects being done with net names, and no interconnecting wires? Currently working on a design that has multiple boards with cable interconnects How do you like to show this? Reference Designator? Potentiometer board - one board to rule them all Using slots to make panel mount “solder lug” potentiometers into pcb mount Not a lot of values in each taper is available in a through hole v...

53 minSEP 24
Comments
Schematics and Connectors, Name a More Iconic Duo...

The Heartbeat of Cats and LEDs

MEP EP#242: The Heartbeat of Cats and LEDsParker Battery charger and maintainer died Took all my batteries with it Company is replacing the unit Nothing looks particularly wrong with the PCB Assembly besides it being gross SF1565SG Current Mode PWM Controller FQPF12N60C Fet used in the PWM Controller HT46R004 HolTek MCU Cost Effective? Cat Feeder Unreminder Ordered a breakout board for the AEM10941 Super Caps SCCS30B106PRB 10F @ 2.7VDC Solar Panel AM-1816CA 84µA at peak power This is specced at 200lx Will this be enough? LTC2956 draws 0.8μA LEDs at 40μA a piece Total draw when Cat Feed Indicator is on is 40.8μA 5F x (4.5V-3.6V) / 0.0000608 = 74,013 seconds -> 20 and a half hours! Stephen Magnetics Transformers arrived! Be specific with what you ask for and ask questions. I almost got bit with dimensional issues Diy Tag connect Made a pogo pin test connector Mill-Max 0955-0-15-20-71-14-11-0 Pogo pins with solder cup on back Using FR4 as mechanical supports Designing a Pawl system...

47 minSEP 17
Comments
The Heartbeat of Cats and LEDs

Failing to Electrocute the Chicken

MEP EP#241: Failing to Electrocute the ChickenParker Bit of feedback on a live stream People suggesting YouTube live Will set this up for episode 242 The little things no one sees that make projects take forever 3D printer update completed New fans TI calls for lower-cost sensors to boost robot adoption “We don’t see as many robots as we’d like” Elon Musk’s Neuralink implant Pig example Stephen High voltage low current measurement - The circuit evolves Adding resistance measurements The new process Use the resistor measurement probes to measure the screen resistors values and record those Use the resistor measurement probes to measure the cathode resistors and record Plug test harness into the DUT Begin test Program will read voltages and using the resistance measurements it will give you a target voltage. Turn trim pot to set idle current such that the power dissipation is met The load is dynamic and this is an unregulated power supply Looking for bananas Want to have “multi-...

49 minSEP 10
Comments
Failing to Electrocute the Chicken

Disturbed Solder Accuracy

MEP EP#240: Disturbed Solder AccuracyParker Got a fully automatic screen printer! ESE US-2000X Potentially lower our minimal paste size Twitch Live Stream podcasts? Amazon multimeter probes Stephen High voltage low current measurement Don't want to break the connection so a traditional ammeter isn't going to work Sticking with the read both sides of a resistor method Caddock 1776-C681 high voltage high resistance high tolerance divider 1/100 so 0 to 500v becomes 0 to 5v ADC - MCP3551-E/SN 22 bit SPI 2.4 meg ohm input impedance Ideally the voltage divider has a “gain” of 0.01 but if the ADC is directly attached to the divider the gain is around 0.0096 Full scale would be 4.8V instead of 5V Solution: add a buffer AD8244BRMZ Quad buffer Typical offset voltage of 100uV Gain error of 0.03% max on +/-15v rails 10T ohm and 4pf input resistance/capacitance - 10^12 Gain error is now 0.009999999901 - Close enough

40 minSEP 3
Comments
Disturbed Solder Accuracy

Frictionless Spherical Cow Transformers

MEP EP#239: Frictionless Spherical Cow TransformersParker Garage Door opener hacking Converting my normal style garage door opener to a “jackshaft” style opener Reversing the direction of the A/C single phase motor? Split phase motors One phase is shifted with a large capacitor by ~90 degrees In my application I just had to reverse the wires and the end stop wires PyInstaller Can take your python scripts and make it into a self contained application Useful for non technical inclined people on your team Cross Platform! GUIs Tkinter seems to work well in Win10 and Ubuntu 20 LTS Stephen High voltage low current measurement Tony_W Recommended the ACS37002 Hall effect sensor that can be ground referenced in very high voltage applications 0.85m ohm conductor resistance 4.8kV RMS isolation voltage VCC of up to 6.5V -50 to 50A sensing range Gain selection of 30mv/A to 60mV/A In my situation I would want to monitor 0.1mA or 100uA. With a gain of 60mV/A that would be 60uV/mA so 0.1mA would ...

50 minAUG 27
Comments
Frictionless Spherical Cow Transformers

Better Encryption than Zoom, Firmware Stacks with AND!XOR

MEP EP#238: Better Encryption than Zoom, Firmware Stacks with AND!XORAND!XOR Previous podcast episodes: Incognito Mode which was episode number 69 Arduino, The Gateway Drug To #BadgeLife which was episode number 109 Espress-ify? Designing Products Around the ESP-32 Platform which was episode number 144 Feel the Hum which was episode number 183 Firmware RTOS vs No OS (i.e. Arduino or pure SDK usage) What about a Bootloader? Zephyr RTOS DTS Config Drivers Whats good about Zephry / What SUCKS about Zephry Drivers Middle Ware GUI App Layer The Cloud Flags and CTF Patching firmware in the wild

80 minAUG 20
Comments
Better Encryption than Zoom, Firmware Stacks with AND!XOR

Latest Episodes

To Bake an Apple Pie

MEP EP#247: To Bake an Apple PieParker PCB Stackup Why is it important to manufacturing? Who should define it? CM? PCB Fabricator? Designer? PCB Bodges Your worst bodge Most proud bodge? DIY Glycol chilling? Chiller Daddy Pump Diverter Stephen Brexit and the UKCA Mark New regulatory mark to make things easier… Goes into affect 1 January 2021 The UKCA marking can be used from 1 January 2021. However, to allow businesses time to adjust to the new requirements, you will still be able to use the CE marking until 1 January 2022 in most cases. The UKCA marking alone cannot be used for goods placed on the Northern Ireland market, which require the CE marking or UK(NI) marking.

53 min4 d ago
Comments
To Bake an Apple Pie

Doing Something Magical

MEP EP#246: Doing Something MagicalParker Physicists build circuit that generates clean, limitless power from graphene University of Arkansas physicists Energy harvesting the thermal motion of graphene Without getting all quantum about it, it seems to work by configuring the graphene as one electrode (or both) of a capacitor. As the graphene flaps in the breeze (actually Brownian motion, I assume), the changing geometry will change the capacitance. The team's next objective is to determine if the DC current can be stored in a capacitor for later use Youtube video Stephen New test equipment design - picking the right opamp Current sensing with a bit of a twist Powered by +/-12V Need to read current on the +12 and the -12 along with a +9V rail Opamp needs to be capable of reading a voltage drop in an environment where the common mode voltage is at or near the opamp supply voltage Current sense amplifiers INA1x9 series amplifiers from TI Supply and common mode range are independent of ...

41 min1 w ago
Comments
Doing Something Magical

K-Factoring a Gumbo

MEP EP#245: K-Factoring a GumboParker Security flaw left ‘smart’ chastity sex toy users at risk of permanent lock-in List to podcast for additional information... Stephen Fusion 360 has changed their personal license subscription model All of these went into effect on Oct 1 Project storage is limited to 10 active and editable documents Exports are now limited to a small number of file types. Thankfully this still includes STL files but alas, DXF, DWG, PDF exports are all gone Perhaps most importantly to the makerverse, STEP, SAT, and IGES file types can no longer be exported, the most common files for those who want to edit a design using different software. 2D drawings can now only be single sheet, and can only be printed or plotted Rendering can now only be done locally, so leveraging cloud-based rendering is no longer possible CAM support has been drastically cut back: no more multi-axis milling, probing, automatic tool changes, or rapid feeds, but support for 2, 2.5, and 3 axi...

44 min2 w ago
Comments
K-Factoring a Gumbo

Comic-Con for Engineers - Chris Carter

MEP EP#244: Comic-Con for Engineers - Chris CarterChris Carter The owner of Mercury Inc. Mercury Inc. is a design consulting firm with expertise in electrical mechanical software and firmware development DFM for PCB Assemblies Industrial Design What is this? Special Assembly Unique processes Sequences and events Design for Serviceability Documentation Change logs

53 min3 w ago
Comments
Comic-Con for Engineers - Chris Carter

Schematics and Connectors, Name a More Iconic Duo...

MEP EP#243: Schematics and Connectors, Name a More Iconic Duo...Parker Battery Charger debacle update Two batteries recovered, One failed Amazon Sidewalk draws electronics from among TI, Silicon Labs and Semtech Amazon Sidewalk, a new shared wireless network for IoT consumer device DXF to Board outlines? Eagles DXF importer doesn’t work all too well Suggestions? AutoDesk Fusion seems to import just fine Stephen Connectors on schematics Rfdave on slack channel asked a question about this Am I the only person who hates a schematic consisting of 1 connector, 2 IC’s, 4 bypass caps with all of the interconnects being done with net names, and no interconnecting wires? Currently working on a design that has multiple boards with cable interconnects How do you like to show this? Reference Designator? Potentiometer board - one board to rule them all Using slots to make panel mount “solder lug” potentiometers into pcb mount Not a lot of values in each taper is available in a through hole v...

53 minSEP 24
Comments
Schematics and Connectors, Name a More Iconic Duo...

The Heartbeat of Cats and LEDs

MEP EP#242: The Heartbeat of Cats and LEDsParker Battery charger and maintainer died Took all my batteries with it Company is replacing the unit Nothing looks particularly wrong with the PCB Assembly besides it being gross SF1565SG Current Mode PWM Controller FQPF12N60C Fet used in the PWM Controller HT46R004 HolTek MCU Cost Effective? Cat Feeder Unreminder Ordered a breakout board for the AEM10941 Super Caps SCCS30B106PRB 10F @ 2.7VDC Solar Panel AM-1816CA 84µA at peak power This is specced at 200lx Will this be enough? LTC2956 draws 0.8μA LEDs at 40μA a piece Total draw when Cat Feed Indicator is on is 40.8μA 5F x (4.5V-3.6V) / 0.0000608 = 74,013 seconds -> 20 and a half hours! Stephen Magnetics Transformers arrived! Be specific with what you ask for and ask questions. I almost got bit with dimensional issues Diy Tag connect Made a pogo pin test connector Mill-Max 0955-0-15-20-71-14-11-0 Pogo pins with solder cup on back Using FR4 as mechanical supports Designing a Pawl system...

47 minSEP 17
Comments
The Heartbeat of Cats and LEDs

Failing to Electrocute the Chicken

MEP EP#241: Failing to Electrocute the ChickenParker Bit of feedback on a live stream People suggesting YouTube live Will set this up for episode 242 The little things no one sees that make projects take forever 3D printer update completed New fans TI calls for lower-cost sensors to boost robot adoption “We don’t see as many robots as we’d like” Elon Musk’s Neuralink implant Pig example Stephen High voltage low current measurement - The circuit evolves Adding resistance measurements The new process Use the resistor measurement probes to measure the screen resistors values and record those Use the resistor measurement probes to measure the cathode resistors and record Plug test harness into the DUT Begin test Program will read voltages and using the resistance measurements it will give you a target voltage. Turn trim pot to set idle current such that the power dissipation is met The load is dynamic and this is an unregulated power supply Looking for bananas Want to have “multi-...

49 minSEP 10
Comments
Failing to Electrocute the Chicken

Disturbed Solder Accuracy

MEP EP#240: Disturbed Solder AccuracyParker Got a fully automatic screen printer! ESE US-2000X Potentially lower our minimal paste size Twitch Live Stream podcasts? Amazon multimeter probes Stephen High voltage low current measurement Don't want to break the connection so a traditional ammeter isn't going to work Sticking with the read both sides of a resistor method Caddock 1776-C681 high voltage high resistance high tolerance divider 1/100 so 0 to 500v becomes 0 to 5v ADC - MCP3551-E/SN 22 bit SPI 2.4 meg ohm input impedance Ideally the voltage divider has a “gain” of 0.01 but if the ADC is directly attached to the divider the gain is around 0.0096 Full scale would be 4.8V instead of 5V Solution: add a buffer AD8244BRMZ Quad buffer Typical offset voltage of 100uV Gain error of 0.03% max on +/-15v rails 10T ohm and 4pf input resistance/capacitance - 10^12 Gain error is now 0.009999999901 - Close enough

40 minSEP 3
Comments
Disturbed Solder Accuracy

Frictionless Spherical Cow Transformers

MEP EP#239: Frictionless Spherical Cow TransformersParker Garage Door opener hacking Converting my normal style garage door opener to a “jackshaft” style opener Reversing the direction of the A/C single phase motor? Split phase motors One phase is shifted with a large capacitor by ~90 degrees In my application I just had to reverse the wires and the end stop wires PyInstaller Can take your python scripts and make it into a self contained application Useful for non technical inclined people on your team Cross Platform! GUIs Tkinter seems to work well in Win10 and Ubuntu 20 LTS Stephen High voltage low current measurement Tony_W Recommended the ACS37002 Hall effect sensor that can be ground referenced in very high voltage applications 0.85m ohm conductor resistance 4.8kV RMS isolation voltage VCC of up to 6.5V -50 to 50A sensing range Gain selection of 30mv/A to 60mV/A In my situation I would want to monitor 0.1mA or 100uA. With a gain of 60mV/A that would be 60uV/mA so 0.1mA would ...

50 minAUG 27
Comments
Frictionless Spherical Cow Transformers

Better Encryption than Zoom, Firmware Stacks with AND!XOR

MEP EP#238: Better Encryption than Zoom, Firmware Stacks with AND!XORAND!XOR Previous podcast episodes: Incognito Mode which was episode number 69 Arduino, The Gateway Drug To #BadgeLife which was episode number 109 Espress-ify? Designing Products Around the ESP-32 Platform which was episode number 144 Feel the Hum which was episode number 183 Firmware RTOS vs No OS (i.e. Arduino or pure SDK usage) What about a Bootloader? Zephyr RTOS DTS Config Drivers Whats good about Zephry / What SUCKS about Zephry Drivers Middle Ware GUI App Layer The Cloud Flags and CTF Patching firmware in the wild

80 minAUG 20
Comments
Better Encryption than Zoom, Firmware Stacks with AND!XOR
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