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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

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 to clasp the pcb Next Revision Make the landing pads bigger Add something for strain relief Move the pins slightly down for more spring Add more anti rotation pins

47 min2 d ago
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 min1 w ago
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 min2 w ago
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 min3 w ago
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

Ice Cream Solder Paste Equipotential

MEP EP#237: Ice Cream Solder Paste EquipotentialParker Cat Feeder Unreminder Started designing the parts and symbols in Eagle. Will post more on twitter as I build the components and put together the symbols Garage Door opener hacking Converting my normal style garage door opener to a “jackshaft” style opener Why? LiftMaster, Chamberlain, Craftsmen are all the same Mine is a Liftmaster Formula 1 Belt drive need to convert to chain drive to attach to the jackshaft All of these use similar drive mechs Other things that are needed Garage door auto lock SureLock Garage Door DeadBolt Cable tension switch LiftMaster 41A6104 Stephen High voltage low current measurement Resistive dividers? Caddock 1776-C681 10M ohm 0.1% tolerance with 0.05% matching Low PPM This method is ok but requires a rather large current sense resistor which is not great. Floating supplies This is how multimeters work. The reference is floating. Isolation solution May go with an isolated solution - basically a power...

57 minAUG 13
Comments
Ice Cream Solder Paste Equipotential

Excited Electrons

MEP EP#236: Excited ElectronsParker Lead Forming Topic Tools 3D printed forms Best practices? Cat Feeder Unreminder Choosing a solar panel Solar Panels generally act like a current source across its useable power band Specifications that are important Power (Watts) - Max Current @ Peak Power Voltage @ maximum power point (Vmpp) Vmpp - Voltage @ open circuit (Voc) AEM10941 Solar Panel Chip Max V is 5V so open circuit can’t be higher then this MPP is set by 2 configuration pins Ratio between Vmpp / Voc Stephen Voltage References and dev boards MCP1501T-20E/CHY 0.1% initial Accuracy Low noise worst case 50ppm across -40 to +125 Capable of sinking and sourcing 20mA AD584 Dev board 0.3% initial accuracy for the J version. The K version is 0.1% Linear rail is shitty Got 300 mm of knock off chineasium linear rail Sounds like sand in the bearings Held vertically the blocks get stuck…

59 minAUG 6
Comments
Excited Electrons

Solar Freaking Cat Feeders

MEP EP#235: Solar Freaking Cat FeedersParker Cat Feeder Unreminder Pulsing current to light LEDs http://donklipstein.com/ledlocup.html http://www.discovercircuits.com/H-Corner/lowpwrflasher.htm Timer IC LTC2956 Power Management Solar with super capacitors Panasonic BSG series solar panels Will have to do research on specifying solar panels AEM10941 https://e-peas.com/wp-content/uploads/2020/04/DS_AEM10941.pdf Built in LDO regulators Stephen Ball screws Bought a small section of ball screw with the associated nut, nut housing, and end block SFU1605 300mm - 16mm diameter and 5mm pitch Trying to work out linear forces and the RPM range if it were to be driven from a stepper motor or servo Mechanical engineering is tough CNC work Cut the first actual project on the CNC Movable cradle for holding chassis - makes working on them super easy Had to spend some serious time working on getting the machine to cut 90 degree Iterative process Flex in the machine - 0.02” accuracy Going to cut som...

59 minJUL 30
Comments
Solar Freaking Cat Feeders

Bashing LEDs

MEP EP#234: Bashing LEDsParker Didn’t get to work on the Cat Feeder Unreminder but there are lots of interest and ideas in our slack channel! TheStumbler Found a 12hr egg timer. Defeats the purpose of building and learning a new embedded skill. Eric McFall E-Ink for the persistent display. This is a great idea. I will look through my parts bins for a e-ink. Might have one. Derek Does it count as feature creep if the project is still doing the same thing but is way more complicated? Tony W Jack in the box DJ Has been working with Flip Dot displays. Kinda power hungry in short bursts. 4A for only 5ms. Bombledmonk Go solar Sanyo / Panasonic has panels for indoor lighting Stephen Snap dome buttons Interesting requirements for footprints. Not sure how to do it. Snaptron BL-series 0.07 or 0.01” hole for LED - not a whole lot… One week product

44 minJUL 23
Comments
Bashing LEDs

Good Enough for a Bagel

MEP EP#233: Good Enough for a BagelParker The Cat Feeder Unreminder Bagel Pin Toaster Controller usable? PT8A2514APE MC14536B 24 stage stage counter with on board RC oscillator Stephen SPI Code Bytes Working on the second PCB revision of a product Code that worked on previous revision didn't work on the new prototype! Changed Chip Select pin for the SPI buss R.F.O. Grant Imahara passes at 49 Maxim is being purchased by Analog for 21 billion dollars

42 minJUL 16
Comments
Good Enough for a Bagel

Latest Episodes

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 to clasp the pcb Next Revision Make the landing pads bigger Add something for strain relief Move the pins slightly down for more spring Add more anti rotation pins

47 min2 d ago
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 min1 w ago
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 min2 w ago
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 min3 w ago
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

Ice Cream Solder Paste Equipotential

MEP EP#237: Ice Cream Solder Paste EquipotentialParker Cat Feeder Unreminder Started designing the parts and symbols in Eagle. Will post more on twitter as I build the components and put together the symbols Garage Door opener hacking Converting my normal style garage door opener to a “jackshaft” style opener Why? LiftMaster, Chamberlain, Craftsmen are all the same Mine is a Liftmaster Formula 1 Belt drive need to convert to chain drive to attach to the jackshaft All of these use similar drive mechs Other things that are needed Garage door auto lock SureLock Garage Door DeadBolt Cable tension switch LiftMaster 41A6104 Stephen High voltage low current measurement Resistive dividers? Caddock 1776-C681 10M ohm 0.1% tolerance with 0.05% matching Low PPM This method is ok but requires a rather large current sense resistor which is not great. Floating supplies This is how multimeters work. The reference is floating. Isolation solution May go with an isolated solution - basically a power...

57 minAUG 13
Comments
Ice Cream Solder Paste Equipotential

Excited Electrons

MEP EP#236: Excited ElectronsParker Lead Forming Topic Tools 3D printed forms Best practices? Cat Feeder Unreminder Choosing a solar panel Solar Panels generally act like a current source across its useable power band Specifications that are important Power (Watts) - Max Current @ Peak Power Voltage @ maximum power point (Vmpp) Vmpp - Voltage @ open circuit (Voc) AEM10941 Solar Panel Chip Max V is 5V so open circuit can’t be higher then this MPP is set by 2 configuration pins Ratio between Vmpp / Voc Stephen Voltage References and dev boards MCP1501T-20E/CHY 0.1% initial Accuracy Low noise worst case 50ppm across -40 to +125 Capable of sinking and sourcing 20mA AD584 Dev board 0.3% initial accuracy for the J version. The K version is 0.1% Linear rail is shitty Got 300 mm of knock off chineasium linear rail Sounds like sand in the bearings Held vertically the blocks get stuck…

59 minAUG 6
Comments
Excited Electrons

Solar Freaking Cat Feeders

MEP EP#235: Solar Freaking Cat FeedersParker Cat Feeder Unreminder Pulsing current to light LEDs http://donklipstein.com/ledlocup.html http://www.discovercircuits.com/H-Corner/lowpwrflasher.htm Timer IC LTC2956 Power Management Solar with super capacitors Panasonic BSG series solar panels Will have to do research on specifying solar panels AEM10941 https://e-peas.com/wp-content/uploads/2020/04/DS_AEM10941.pdf Built in LDO regulators Stephen Ball screws Bought a small section of ball screw with the associated nut, nut housing, and end block SFU1605 300mm - 16mm diameter and 5mm pitch Trying to work out linear forces and the RPM range if it were to be driven from a stepper motor or servo Mechanical engineering is tough CNC work Cut the first actual project on the CNC Movable cradle for holding chassis - makes working on them super easy Had to spend some serious time working on getting the machine to cut 90 degree Iterative process Flex in the machine - 0.02” accuracy Going to cut som...

59 minJUL 30
Comments
Solar Freaking Cat Feeders

Bashing LEDs

MEP EP#234: Bashing LEDsParker Didn’t get to work on the Cat Feeder Unreminder but there are lots of interest and ideas in our slack channel! TheStumbler Found a 12hr egg timer. Defeats the purpose of building and learning a new embedded skill. Eric McFall E-Ink for the persistent display. This is a great idea. I will look through my parts bins for a e-ink. Might have one. Derek Does it count as feature creep if the project is still doing the same thing but is way more complicated? Tony W Jack in the box DJ Has been working with Flip Dot displays. Kinda power hungry in short bursts. 4A for only 5ms. Bombledmonk Go solar Sanyo / Panasonic has panels for indoor lighting Stephen Snap dome buttons Interesting requirements for footprints. Not sure how to do it. Snaptron BL-series 0.07 or 0.01” hole for LED - not a whole lot… One week product

44 minJUL 23
Comments
Bashing LEDs

Good Enough for a Bagel

MEP EP#233: Good Enough for a BagelParker The Cat Feeder Unreminder Bagel Pin Toaster Controller usable? PT8A2514APE MC14536B 24 stage stage counter with on board RC oscillator Stephen SPI Code Bytes Working on the second PCB revision of a product Code that worked on previous revision didn't work on the new prototype! Changed Chip Select pin for the SPI buss R.F.O. Grant Imahara passes at 49 Maxim is being purchased by Analog for 21 billion dollars

42 minJUL 16
Comments
Good Enough for a Bagel
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