Greg
@GregDavill
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ASIC/FPGA/PCB/FW engineer at ASTC 🧙♂️ (He/Him)
Adelaide, South Australia
Joined March 2009
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As much as I love different coloured PCBs.
Green is still such a classic! 😍
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0402 Pb-free reflow. 🎞️
alt: 0402 capacitor on two patches of solderpaste. The solder melts moving the component in place.
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Saw this from
@pcbherohq
on Linked in:
It's just a small mirror and lens to shift the perspective. Then by rotating you get an interesting 3d inspection around a part.
I wonder how easy it would be to attach to my stereo microscope.. 🤔
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I bought some 01005 resistors in my last LCSC order, just to marvel at how small they are.
Pictured with a ball-point pen, and some raw sugar.
Pretty sure I won't be designing any PCBs using 01005's any time soon :P
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SMD assembly trick. Use a mirror to check for orientation markers under the IC.
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Some low cost RISCV ICs 😋
These are CH32V003's that I bought from the WCH aliexpress store.
@Patrick_RISCV
tweets a lot about their RISCV offerings.
Crazy that you can get 32Bit, 48MHz with 16KB FLASH for <$0.50 in low qty.
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Hmm. I wonder if
@oshpark
flex would be flexible enough to experiment with this technique....
Construction is 2 separate layers with polymide between them, bending causes top electrodes to slide forward/backwards compared to the bottom electrodes. Very clever!
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Gonna try out these two antennas from Molex.
The Ceramic one is a bit cheaper, but not as cool looking as the MID antenna. 😂
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You gotta give your capacitors a little boop.
It helps them get settled.
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Really liking these reverse-mount RGB LEDs:
Combined with some clear resin mixed with just a drop of titanium dioxide based white dye makes for a pretty good diffuse indicator.
I've also used the PCB as an end plate for aluminum extrusion enclosure
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A low cost 24G radar module I threw into my last LCSC order. Keen to see how well these work for precence detection compared to PIR.
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Tweet a random picture from your phone with no explanation
Tweet a random picture from your phone with no explanation
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Valve hardware always looks so slick. I love all the attention to detail! 🤤
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Took some footage of the d20, some b-roll, complete disassembly, and some hot-air rework.
It needed some quick repairs:
- 2 LEDs I damaged when my fingernail caught under them catching it.
- 2 more LEDs were missing a colour.
- I damaged a Mosfet while removing the panels.
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Layout aesthetics: Each design should have at least one component placed off the orthogonal axes.
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New lab addition.
Only the best 1994 has to offer.
- DOS based software
- 0603 capable
- Twin pickup head
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I really like the style of wireframe vectors that Fusion 360 creates from the drawing environment.
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Engineers hate this one simple trick
Don't have any 2.49k resistors. But do have plenty of 5.1k?
Just populate 2 of them.
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These tracks don't need to be rounded...
But I like that they're rounded. 😊
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These PCBs turned out great! There is something magical about Matte Black/ENIG. 😍
This is my first time doing silkscreen art like this. After routing I exported my board layers into inkscape, did the artwork then imported back into kicad.
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Ahh yes. 3-wire USB.
Who needs a GND wire when you can just use the shield.... 🤮
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Everyone: On SMD LEDs the green dot marks the cathode.
LED manufactures: Hold my beer.
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Often I find it easier just to look at the die/bond-wires inside LEDs to determine their polarity.
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Lets allocate some time into routing this. Only 722 un-routed nets to connect. 😳😨
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Macro photo time: These boards have exposed ENIG around their perimeter to make good electrical contact to a metal mechanical assembly.
But it also just looks nice! 😍
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"We can fit 6 letters on this package, So we could print the part number and voltage..."
IC Designers: "Nah, lets go with TDHaVA"
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I place this one under the `fun` packages to solder at home.
1mm x 1mm 2v5 LDO.
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These uncoated micro-striplines look great on
@oshpark
purple.
Solder mask over transmission lines can increase transmission loss. You'll typically see it in test/measurement gear.
It's unlikely an issue in this case, But I do like the look.
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From a recommendation on twitter a few months back I ordered some of these SDK08 SMD test-hooks. They're cool, the main shaft is just 1mm and insulated, so it's possible to use these to probe something like a TSSOP part.
These will come in handy :)
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Fun assembly defect: 0201 tombstone soldered to an adjacent 0603 part.
🙏
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Or when parts come in packaging designed for candy 😋
For all you folks complaining about AliExpress vendors’ lacking ESD practices, I present you the literal sandwich bag - received from a German manufacturer of RF modules
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So the OrangeCrab gets a bit warm/hot when running designs with the LiteDRAM DDR3 Controller.
Seems to settle in around 55-65C.
Small brain: Alter the gateware to reduce power.
Big Brain: Design a custom heatsink.
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Do you see the two resistors next to my coffee mug?
Let me zoom in so you can see. 😅
Sizes: 2512 vs 01005 🤏
One reason to pick a larger package is power dissipation. In this case: 1W compared with 1/32W
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Solderpaste seems like a good subject for my new "Super" Macro lens
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I was cleaning up my desk and found a project I did a couple of months ago.
I got this 3B+ Pi awhile ago for free with an arrow order. There was no A variant at that time.
All processor critical signals are kept near the processor. Some quick work with a hacksaw it still boots
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I love 3d printing!
Took a few iterations to get tolerances perfect.
This jig holds these tiny pogo-pins securely in place and enables initial programming of the bootloader onto this board.
Much easier than me soldering wires down to every board 😂
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I know they're called "micro" chips.
But it's still a shock how small they actually are.
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Just assembled a board, so you know what that means.
Macro photos!
🧵
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Practising my bodge skills
This is a QFN where the footprint on the PCB was incorrect.
Just a couple more bodge wires to add.
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I've been having fun de-layering PCBs. So I thought I'd try out one of my own.
These are the panels on my LED d20. Each panel has driver circuitry for driving a 16x16 RGB matrix, but there are only 120 LEDs on the front in a 15 wide, 15 tall equilateral triangle. Fun to route.
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Took a little while. But here is probably* 16GB of LPDDR3.
*Bought off Aliexpress.
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Routing buses is much more challenging when you're not using FPGAs and can't just assign any pin to any signal 😩
Slowly untangling the mess of spaghetti
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Half routed, a prototype of an icebreaker design replacing the FTDI with a CH32V305, a low cost microcontroller featuring a High-speed USB interface.
It's offered in a 64-pin package which would be a nicer fit on this PCB, but that package isn't available at distributors yet.
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Willem reached out to me with this project log. They've recreated my LED cube design, using custom LED panels!
After myself and
@arturo182
, they're the 3rd person I've seen complete this project! Congratulations!
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After mentioning these SD cards from lcsc ~6mo ago I've finally bought some for a project.
These are "SD cards" are in an SMD package.
This particular device is 1Gbit (they have devices upto 8Gbit). For about $2.
Way simpler to source than 1Gbit uSD cards.
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This is either a great idea, or a terrible idea.
I'm still not sure which...
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Electronics in close proximity of my desk typically get disassembled when I'm bored.
Nintendo Switch Pro controller.
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The media says millenials don't own their own home because they spend all their money on things like avocado toast, and uber eats.
In my case, it's because I spend all my money at digikey 😆
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Look at these cute single channel SMD ethernet transformers!
These are ALT4532P from TDK.
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Got to cross off the "Buy $200 devkit, salvage $10 in ICs to complete a prototype" on my 2021 EE bingo card. 😐
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