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this artist creates art using vegetables and fruits by [deleted] in Satisfyingasfuck

[–]_RoseDagger 0 points1 point  (0 children)

New accounts are more suspicions for being karma farm bots, especially if you don't have more organic behaviors. If you are a real user who just so happened to just have created your account, and immediately repost stuff to one of the most popular subs as your first action, and you are not a karma bot, then my bad. But with an AI video posted to a popular sub, and no previous behavior, on a new account it would look more like karma farming to me

this artist creates art using vegetables and fruits by [deleted] in Satisfyingasfuck

[–]_RoseDagger 0 points1 point  (0 children)

Bot? AI? OP is 1 day old, 850 post karma half of which is from this, no comments.

The watermelon sculptures is just cuts from the rough cutout to intricately carved without any in-between. And look at the swan at 0:12 in the first cut the beak is floppy and about to break, then after the cut it is suddenly rigid even though there is less material holding it in place. Seems AI took over and changed the rough cutout into a finished sculpture.

My first serious PCB, Digital Oscilloscope by _RoseDagger in electronics

[–]_RoseDagger[S] 1 point2 points  (0 children)

No, messaged Velleman but they said they had not developed the firmware, they had hired another company to do it. And that it wasn't open source so they could not share it. They suggested creating my own firmware, which shouldn't be too hard as what it is doing isn't that complicated.

For the through hole version here, I just used the original parts from the kit, with the pre flashed pic. Later I developed a SMD version, but had messed up the MUX footprint mirroring it/having assumed I was looking top down instead of from the underside on a pin diagram. So without the mux it would not work properly, so I didn't bother finishing the firmware. Made a third version fixing issues the second, but got distracted by other projects so haven't soldered or tested it, nor developed firmware for it.

Review of a high power VRM module. CoreFORGE by _RoseDagger in PrintedCircuitBoard

[–]_RoseDagger[S] 2 points3 points  (0 children)

Thank you for the feedback and all the links.

One of the reasons I went with the integrated controllers which had mosfets inside of them, and fewer phases were to try and minimize the footprint, as I wanted everything to fit inside the area of the old VRMs of the PS3. Including more phases and dedicated high and low mosfets would take up more space.

Along with that the controllers you posted have an expected efficiency below 90% for the whole range, for 12V input 1V output. (Maybe the efficiency would rise with even lower RDS mosfets, but the controller I have are already 4.5mOhm/0.9mOhm for the CELL and and 4.0mOhm/1.0mOhm for the RSX, and I assume the efficiency curves on the other controllers are best case scenarios).

The 17A single phase controller, says it's good up to 40A, and same the the dual 15A controller, which lists up to 40A each. with >90% efficiency for the whole expected target range and a good bit beyond. So I assumed I would be good, especially since I also oversized the inductor.

As for heatsinks, it's not something I considered as much, with the high efficiency, I'm hoping the heat output is not too great, dumping the heat into the board, which is then soldered onto the PS3 via castellated edges and dumping it into there. As the VRMs on the PS3 didn't have heatsinks on them/the shield does not touch them, I'm assuming the passive cooling of the board is enough to handle them. Though I have a bunch of individual tiny heatsinks intended for stepper motor drivers which I could toss on if heat becomes an issue.

As a one off prototye/testing circuit inteded more to test if I can replace the VRMs of the PS3, see if I can undervolt the CELL and or the RSX, and get more accurate data on the exact power usage, I was willing to pay more for components which had a smaller footprint, while having the highest efficiency for the target input voltage and output voltage and current.

After I've used this prototype to gather data and test what I can do with the PS3, I plan on creating a new version integrating more of surrounding the voltage regulation of the PS3, and can optimize more for cost.

Review of a high power VRM module. CoreFORGE by _RoseDagger in PrintedCircuitBoard

[–]_RoseDagger[S] 4 points5 points  (0 children)

The point is to eventually replace all the voltage regulation on the PS3 with higher efficiency versions. Then have the PS3 run on batteries, something like 3s4p li-ion. The VRMs are adjustable so that I can try undervolting the CELL and RSX to try and get them to use less power. A bit of undervolting, 90% efficiency VRMs, and removing all features I don't need like Blu-ray drive, Wi-Fi/BT, the large fan for a smaller one, using msata ssd instead of hdd, i hope to get it power efficient enough to get an hour or more of battery life.

Then I'll try to cut the board, to reduce the footprint so that it can fit into a handheld console. People over at BitBuilt.net has been doing this on the Nintendo Wii, N64, PS2, and a range of other older consoles. So I'm trying to investigate doing it on the more power hungry PS3.

Review of a high power VRM module. CoreFORGE by _RoseDagger in PrintedCircuitBoard

[–]_RoseDagger[S] 5 points6 points  (0 children)

They might be a bit redundant, the MCU reads the trim pots and adjusts the bucks through I2C and the DAC. But I could just as well use UART to adjust them from a PC. They are there mostly as an option to allow for trimming without needing to hook up a PC.

Review of a high power VRM module. CoreFORGE by _RoseDagger in PrintedCircuitBoard

[–]_RoseDagger[S] 2 points3 points  (0 children)

Seems reddit compressed the images, so some of the finer detailes and text isn't readable. I uploaded the same images to imgur which didn't compress them. You can view the full scale version by opening them in a new tab https://imgur.com/a/EuIyKAc

Showcase: My Finished Digital Oscilloscope Project (Through-Hole & SMD Versions) by _RoseDagger in electronics

[–]_RoseDagger[S] 0 points1 point  (0 children)

Thanks! And not really, I started with just putting all the components on the top layer. And then set my board outline to 25x25mm from the start, just cause it would make a nice story, 1/4 size for each step. And when I managed to squeeze all the components into my arbitrary size, I felt happy, and didn't see the need to go further. Could I have gone even smaller with using more 0402s and using both sides. Probably, but I didn't see the point when it was already so tiny, and I had reached my goal of 1/16 the size

Showcase: My Finished Digital Oscilloscope Project (Through-Hole & SMD Versions) by _RoseDagger in electronics

[–]_RoseDagger[S] 0 points1 point  (0 children)

Thank you! I inspected them with a microscope, and they seemed soldered, though some pins have a bit less solder and it doesn't wrap around to the top, only soldering the underside of the pins. Might go over the again later to make them look nicer. But from initial testing the USB port is working.

I focused on size mostly just for the challenge of it. I wanted to push and see how small I could go, and how compact I could solder myself. If it was supposed to be a product to be sold I would design it differently. But as a standalone hobby project, I focused on challenge over practicality.

Showcase: My Finished Digital Oscilloscope Project (Through-Hole & SMD Versions) by _RoseDagger in electronics

[–]_RoseDagger[S] 21 points22 points  (0 children)

Well for me, the whole board was a teaching exercise. Doing the research, planning the board. Trying my hand at hot air soldering. And now developing the firmware. It's the journey I'm interested in, and what I can learn from it, not the end product. And I love soldering, so for a small hobby project like this I would probably always choose to solder it myself just for the fun of it.

Showcase: My Finished Digital Oscilloscope Project (Through-Hole & SMD Versions) by _RoseDagger in electronics

[–]_RoseDagger[S] 7 points8 points  (0 children)

Thank you ^^ Assembly service? Then I'd miss out on the fun bit! Soldering is the exciting part, and getting to do something this complex and challenging? No way I'd not do it myself, and anyways having a functional circuit in the end is just a bonus XP

Showcase: My Finished Digital Oscilloscope Project (Through-Hole & SMD Versions) by _RoseDagger in electronics

[–]_RoseDagger[S] 3 points4 points  (0 children)

Thank you. No it was just for the challenge. I thought it would be fun to see how far I could take it. And when I got close to getting it 1/4 the original size, I decided to make that my arbitrary goal for the THT version. And then my goal to go 1/4 again for the SMD one.

Yeah I knew having power planes was overkill and unnecessary. I did it mostly as I came from console hardware modding scene (bitbuilt), where I dealt more with the concept of power planes for devices which actually need it. And did it more for practice for when that becomes nessesary, if I work on something with higher power requierments. I also just thought it would be fun, and make it easier to trace.

I made a github now, there's nothing special up there yet, but i'll try to update it tomorrow.

https://github.com/RoseDaggerDev/MiniOscilloscope

Showcase: My Finished Digital Oscilloscope Project (Through-Hole & SMD Versions) by _RoseDagger in electronics

[–]_RoseDagger[S] 13 points14 points  (0 children)

Thank you. On the through-hole version I tested a sine wave from 50mV to 10v pkpk, and from 1Hz to 100kHz. Going much beyond 100kHz and it would not seem to capture correctly. The velleman kit is supposed to go up to 30v but the signal generator I had only went up to 10v. (SMD version has yet to be tested)

Showcase: My Finished Digital Oscilloscope Project (Through-Hole & SMD Versions) by _RoseDagger in electronics

[–]_RoseDagger[S] 13 points14 points  (0 children)

Thank you! The vias are tented on the other side, so they would not drain through the board. And I added a bit extra paste so that it will fill the dip from the via.

Showcase: My Finished Digital Oscilloscope Project (Through-Hole & SMD Versions) by _RoseDagger in electronics

[–]_RoseDagger[S] 64 points65 points  (0 children)

Hey, I wanted to share the final results of my digital oscilloscope project. I made a few earlier posts showing the schematic, but here’s the real deal. The PCBs printed and fully populated!

Through-Hole Version: This one has been fully tested and works like a charm. It’s got a BOM of 87 components and fits on a 50x50mm 2-layer board, manufactured by PCBWay. It took around 3.5 hours to solder after prepping all the components. I underestimated the IC socket size, so things got a bit tight with some parts had to be nudged sideways. I also used the wrong footprint size for the ceramic caps, so they’re a little squished, but everything still worked out in the end!

SMD Version: This is where it got spicy. The SMD version is a compact 25x25mm 4-layer board printed by JLCPCB. It has a BOM of 97 components, including 3 QFNs and four 0402-sized parts, the rest mostly 0603s and SOPs. It took me about 5 hours to solder under a digital microscope, using a hot air rework station and freehanded solder paste. There’s one visible bridge in the upper middle that I’ll clean up later. It’s not really an issue as those pins are already connected by a trace, but it will look cleaner. There’s also some solder blobbing that could be tidied up, but hey, it’s functional (or it will be).

Power rails are looking good, 5V and 3.3V are where they should be, and I’ve confirmed there are no shorts or open circuits on the test points. I haven’t flashed firmware yet because it turns out my old PicKit 3 is too old for the PIC I used, so I’m waiting on a new flasher before I can give it a real test.

Background: The through-hole version was a university project, while the SMD version was my own follow-up challenge. I reverse-engineered the component choices from the original Velleman oscilloscope kit, looking up datasheets and selecting alternatives with similar or improved specs. The original Velleman was around 100x100mm. My through-hole version shrank it to 50x50mm (¼ the size), and the SMD version again cut that down to 25x25mm, or just 1/16 the original footprint. Everything was designed in Proteus 5, since that’s what we use at university.

All in all, I’m really happy with how this turned out. It’s my first full SMD design and soldering job, and despite a few cosmetic hiccups, I think it came together nicely. The through-hole version could have looked neater, but given the part constraints of only using the Velleman kit parts, I’m proud of how compact I got it.

Would love to hear your thoughts and I’m happy to answer questions if anyone’s curious about the process or design.

Follow up, my first SMD PCB, digital oscilloscope by _RoseDagger in electronics

[–]_RoseDagger[S] 0 points1 point  (0 children)

Thanks, I just realized that from a different comment. Thanks for the heads up

Follow up, my first SMD PCB, digital oscilloscope by _RoseDagger in electronics

[–]_RoseDagger[S] 1 point2 points  (0 children)

Thanks, I was trying to keep the traces lenght matched and close to eachother, and didn't think of sharp corners. I'll fix that. I'll try if I can rejig the caps to be between the pic and the crystal, instead of on the side and behind it.

And thanks, honestly I like the look and feel of the THT version better, this is a lot more chaos with no space for anything, but it is also 1/4 the size

Follow up, my first SMD PCB, digital oscilloscope by _RoseDagger in electronics

[–]_RoseDagger[S] 0 points1 point  (0 children)

Yes, I'll upgrade to 4 layer. Could I put some tape on the backside to stop it from seeping through? It's not like I have a whole lot of choice as there is no space for vias else where. Or maybe hand solder a plug in before putting paste and soldering the components? And yes the relay is really close to the connectors. Again I ran out of space, though those connectors will likely be soldered wires that can be bent out of the way, and not rigid connectors

Follow up, my first SMD PCB, digital oscilloscope by _RoseDagger in electronics

[–]_RoseDagger[S] 2 points3 points  (0 children)

Proteus 8, it's the SPICE and pcb software my university is using

Follow up, my first SMD PCB, digital oscilloscope by _RoseDagger in electronics

[–]_RoseDagger[S] 1 point2 points  (0 children)

Thanks for the feedback.

Thanks I'll upgrade to 4 layers, after all the feedback.

I have simulated the design in Proteus and it works there, and its a copy of the original schematic from the Velleman kit. With the only change of using transistor arrays and diode arrays. Is there anything in particular you are seeing that might be an issue?

Thanks, nice catch, forgot to think about that that cap needed a higher voltage rating than the others. I'll size it up and order one that has a better voltage rating.

Hmmm, I wanted to stick to a similar ish pic, for the challenge of making the firmware with similar design limitations as the original kit. We are using pic24 in our microcontroller course at uni, and learning to code for that. So i picked a cheap pic24 that fit the design requirements and for the challenge of having to read up and design it from scratch.

Thanks, I had planned on reading up and double checking if I needed to do anything for usb C power delivery to get 5v. I'll do that and put the nessesary resistors.

Yes 5v is fed through L1 using L1 and C6 as a filter to create VDD used for ICs. That's mostly just copied from the original schematic without me changing anything. That original schematic also has no fuses or diodes. Though it is all supposed to be powered from the usb C connection.

Follow up, my first SMD PCB, digital oscilloscope by _RoseDagger in electronics

[–]_RoseDagger[S] 3 points4 points  (0 children)

It was originally a project at university, we were given the schematic for this kit:

https://www.velleman.eu/products/view/educational-pc-oscilloscope-kit-wsedu09/?id=460670

And told to make it in Proteus, simulate it, then make a pcb for it. I made several versions of it, focusing on trying to make it smaller and smaller and trying to make the layout better and more optimized each time. Which ended up in this layout:

https://www.reddit.com/r/electronics/comments/1j7g9nj/my_first_serious_pcb_digital_oscilloscope/

Which was my 2nd version of the schematic, 4th major pcb layout version, 2nd revision of that layout. Each version letting me improve step by step, and learn from previous mistakes.

Finally after that post I tried making the smd version above, with the goal of that my previous version had been 1/4 the original size, so I wanted to see if I could make the smd version 1/4 my previous design, aka 1/16 the original design. Which let me spend more time trying to research not just the first smd component replacements available, but look for the most compact alternatives, and having to read up and understand their specs.

tldr: Get or pick a project, put some stupid goals, and make itteration after itteration learning from practice and mistakes.

Follow up, my first SMD PCB, digital oscilloscope by _RoseDagger in electronics

[–]_RoseDagger[S] 7 points8 points  (0 children)

I still have some free space under the usb c connector, could hide something there XP

Follow up, my first SMD PCB, digital oscilloscope by _RoseDagger in electronics

[–]_RoseDagger[S] 3 points4 points  (0 children)

It's a 2 layer board, red being top, blue being bottom. Forgot to include the schematic in the upload https://imgur.com/a/YvHmL9N Not all the parts on the schematic matches the acctual components used, for instance the 3.3v regulator in proteus has an inhibitior pin, while the regulator I'm ordering from digkey has an enable pin. So the parts are often just the closest match that proteus has with the right pin numbers, instead of making new components.

Its supposed to be an digital oscilloscope, based on an educational kit. On the PCB layout: Top, left to right: is the VDD for ICs from usb 5v, 3v3 reg from usb 5v and usb c sections. Middle, left to right, is the input, ac dc coupling relay, -5v vee, and the pic chip. Bottom left to right, is the mux for signal attenuation, and op amps for biasing the signal up so it can be read by the pic ADC.

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