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- เผยแพร่เมื่อ 21 ก.ย. 2024
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Some basic power up testing of Dave's prototype USB power supply.
With some bonus Murphy's troubleshooting.
Thanks to www.pcbzone.net for the PCB
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![[TH] JFT vs RLF - VCT Ascension Pacific - Day 2](http://i.ytimg.com/vi/PuIH7w_jO6c/mqdefault.jpg)
I don't know a single EE that hasn't blown that footprint at least once. Keep the videos coming. Good stuff.
This video demonstrates exactly why I chose to subscribe. Thanks for the troubleshooting demo and creating (accidentally) a real world example of how a professional EE handles their day to day.
Really educating video about testing a new board. These things just happen, especially when things are done in a hurry.
It's nice to know that even the pros make the occasional mistakes. I admire the honesty of you videos. Keep up the good work Dave!
WTH, we went from a case, decade digit display to what? This? Disconnect!
Amazing I was just doing a circuit with a 2n3094 a little while ago(through hole type) and I was thinking the footprint looked back to front. Luckily I haven't sent it off yet.
You can tell a blokes fair dinkum when he admits his mistakes. Love this type of video Dave with the troubleshooting. Theres lots to be learnt in troubleshooting.
Fantastic! I just finished my second homemade PCB and made the exact same mistake. I didn't notice that the pin definitions had changed between the through hole and surface mount component. Ended up flipping the chip over and dead bugging it. Now I don't feel quite as bad about making a mistake like that! :)
Awesome video. Damn pinouts will getcha every time. I've done it before when changing sources.
This was a very good video. Electronics engineering is seldom pretty and this is a good example of discovering and explaining all the warts that crop up in a design. I found this thoroughly entertaining.
I remember doing this transistor mistake myself ! I feel your pain !
It's really interesting to see the schematic.
Great to see the prototype. Well done Dave!
that chip not being available is why I usually buy the parts for some protos during the board design if I'm reasonably sure I will be using it. I been bit by the "we got it now but not later" bug several times. it's a big downer when that happens.
Dave, we want more of this!!
Dave, you are living the dream!!!
Yep, I thought about that.. but it means having a ton of massive 96pin sockets and connectors for each of the sub boards. I did layout the design like that and the resulting backplane came to 10cm x 16cm which is too big for the cheapy PCB services. I have decided to go for connectors for the more complex modules and all of the basic stuff will be in an FPGA so the risk is slightly reduced.
Excellent Dave, transistor thingy happened to me as well :-)
I had same issue with 3904 once and I had to demo the project in the morning and guess what ! my quick fix was to bend 3904 pins to other side so the face of transistor is now laying on PCB ;)
+pooyamz , seems to be a really classic case :)
These bloody standard Altium sot-23 footprints. Who knew they are faulty)) As one of my teachers said, use standard libraries if you want problems)
@ 6.25 "Stupid default AC current ....Yeah blow it out your bum !"....I couldn't stop laughing love it Dave ; )
Read the video description.
I had exactly the same problem with the FT230XS; I used it for the prototypes, and then couldn't get any anywhere for months for the production run. I ended up changing the PCB to accomodate either the FT230XS or FT231XS, since there was still some stock of the latter.
Both are now out of stock though :/
"Fire & Dandy" a new catch phrase? :)
Brilliant!
FT chip can be replaced with PL2303XA, or CP2102. Both chips are lower cost.
Ref display clash. Just file a recess in the display board - looks like it will miss the only track in that area.
Few questions
-Isn't it unprofitable to make pcb-s at this phase? as they are quite expensive to make in small quantities?
-Do you solder the components on your prototype pcb-s or some dedicated company?
Maybe you could break it down into several smaller boards with fewer layers.
Hey Dave! Great stuff. Could you tell us about how much does your prototype costs?
Thanks!
Why a soft switch and such a tiny lipo? Should get one that's as big as the board to maximize usage time. I like this idea although I would have gone with twice the power output and used 2 usb ports to get 5W instead of the 2.5W in your design. How would this supply react to a dead short? Wouldn't want to overload the usb ports on a computer.
That footprint in Altium has burned me many times before!
that is one sexy piece of kit
PLSSSSSSSSSSSSSSSSS!
GIVE US SCHEMATIC!
How long we have to wait?
It dont must be finished&tested...
Making crappy little mistakes is the biggest thing stopping me from sending my first real board off for production.. it's $100 (It's pretty big, 4 layers) to get the board made and I can just imagine it getting here and there being some screw up that makes it unworkable :/
well done dave a fantastic rev 1 it looks ace. Also just brought a hameg 203-4 for £45 off ebay :D
I love Your channel. Thumbs up!!!
Please can you make this open source. I would like to learn how you designed your schematic. I would like to make my own based off yours but a stripped down version.
will you make a video about the software part as well? would be hell of a lot interesting (at least to me)
...and awesome!!!
It's a battery powered USB lab power supply. Just like your regular bench supply, but smaller and battery powered.
Dave, why are you using a 2n3904 BJT instead of a 2n7002 FET? Then you'll never make that mistake again.
As in "Electronics design engineer / fulltime video blogger"?
Wow, I almost made this same mistake with this exact transistor on a board that I designed but I managed to catch it.
That is why i use the 3d parts in altium ;)
why is there a platypus on your PCB?
Finally a video worth watching... lol :p
so what is the point of this device? is it so you can charge various batteries off USB?
I reckon you should give me one of your Fluke 87's! :p
EPIC WIN!!! :-)
Dave how much (ish) do you pay for your prototype boards? Nice video.
Dave are you using the Fluke 17B probes? they look familiar ;)
This!
very cool design idea , so , when can i buy one from you?
Get the grinder out!!
Yep you should always write things down. The old saying never assume because it means make a ass out of you and me.
There is also the old adage if we do not learn something history will always repeat itself.
will these device(s) be for sale when done?
what do you do for a living?
as in what?
A diode walks into a bar, goes up to the bartender and says ....
(okay, I made that up.... hahaha )
lol again 0:00 "duh" :->
As in video blogging.
can't be.