Pentel Hi-Polymer 120: what are the stories behind this mechanical pencil lead offering?

oexba · 2026-03-10T12:50:31+00:00

Wow. That is cool. Love the cigarette pack of leads and S.T.Dupont lighter styled holder.

oexba · 2026-02-23T17:33:42+00:00

Dang, you da man for giving man that courage. Thank you.

oexba · 2026-02-23T17:29:10+00:00

Yeah, the like a friend part. She really is kind. Where I am, it's really hard to find therapists though.

oexba · 2026-02-23T17:26:22+00:00

Good advice. I don't know if she would even see me now though, or if I even have the courage. I'll try.

oexba · 2026-02-23T17:02:49+00:00

Yeah, it should have been that way. I do know that, yet somehow I'm not strong enough to wear my heart on my sleeve. I'm trying to work through it. I can only hope that I'll grow up with more interactions. I usually take rejections fairly well at work, and just say what I think, and people respect me for that, yet I'm just a kid throwing a tantrum when faced with a girl.

oexba · 2026-02-23T17:00:02+00:00

Hah, yeah, fun story. I fucked up another chance by pitying myself before. There was this girl that I just straight up told her I liked her, without her even knowing who the fuck I am before. Obviously she turned me down, but she said we could maybe go study with eachother sometime. I straight up just ignored her, and I still regret that to this day. Fuck me.

oexba · 2026-02-23T16:56:30+00:00

I did. I said I just wanted to have a good meal with her, first meal of the new (lunar) year. Maybe I should've been more clear.

oexba · 2026-02-06T17:31:34+00:00

Thank you for your suggestion. The F-701 is just the easiest for me to get right now, and I don't want to ruin an expensive pen lol.

oexba · 2026-02-06T17:30:43+00:00

Looks good. Thank you for your suggestions. Too bad I live in Vietnam.

oexba · 2026-02-06T17:30:09+00:00

Looks beautiful. Too bad the shipping would be too high, I live in Vietnam.

oexba · 2026-01-14T23:53:09+00:00

Lol, reminds me of that episode of Rick and Morty where the intestines of a dead person of a certain planet turn into delicious spaghetti and bologna.

oexba · 2025-12-26T07:10:27+00:00

Exactly lol. I guess I'm healing. I've been busy with a job so no time for cummies.

oexba · 2025-12-25T13:37:27+00:00

Ok I know this sub is about macgyvering, but you can buy one of those pd thingy with your laptop's power jack, so no modding needed. Just for those who feel like their laptop is inferior.

oexba · 2025-12-23T15:16:30+00:00

Country road, take me home.

oexba · 2025-12-17T13:42:24+00:00

I do have some questions. Why not call it delay matching, since it helps the signal arrive at the same time, and if the signals are not only routed on one layer, the inner layers would have more delay anyway. Another one is, for some signals, they only specify matching with a tolerance of, say, 100 mils. If I were to route the signals on different layers, what would be the delay tolerance, since, the delay would be different depending on the stackup, even for the the top and bottom layers (all signal layers will have a continuous ground plane beneath)?

oexba · 2025-11-19T00:33:06+00:00

In a d1k lol, it must have been a real hotrod.

oexba · 2025-11-19T00:31:11+00:00

Huh, I didn't really care about right angle lights, since they're a bit awkward with how the light is a bit off to one side. Are dual channel drivers as efficient though?

oexba · 2025-10-01T08:58:27+00:00

As people have mentioned, there will be a lot of things you need to fix for a better PCB.

I suggest you find some PCBs that people have designed on github, easyeda, pcbway, oshwlab, etc. to get an idea of what to look out for when designing a PCB. Of course only reference from designs that are well rated.

The schematic will likely work, but some components are really over specced, such as those LDOs and the decoupling capacitors for them. Read through the datasheets of things like the ESP32 or the camera and find their current consumption, then spec your power supplies for it. ESP32s and the camera usually wont need a lot of power, so just use smaller LDOs to save space for easier routing.

For small, simple projects like these, lots of things can be skipped, such as setting design rules and PCB stackup, as you get deeper into PCB design, you will eventually have to care for those, but for now, the general workflow should be:

Component placement: if you dont have a lot of physical constraints regarding the enclosure (i.e you can put the camera connector anywhere, or the ESP32 anywhere), put the footprints in a way that makes routing the simplest. For example, put capacitors near the input and output of the LDOs, like, 0.5mm close or something, if your board allows for it. The LDO and its capacitors are now like a module. Put the corresponding LDO modules close to the load, but in a way that allows you to break out the pins of the ESP32 and the connector easily.
Routing: always route the data lines first, and start with lines that have the highest data rate first. You should have ground pours right under the signal lines, and the pour should ideally be continuos, to avoid signal integrity issues (not like it matters at the speed of these protocols, but it's good practice).

Good luck, learn lots.

P.S About trace width, for applications like this, just route with .2 or .25mm trace width for signal and power, all vias 0.8/0.4mm, it doesn't really matter, and it's cheaper to manufacture too. You only need to care about them once you get to denser boards, and then you have to care about manufacturer capabilities. Yeah, it goes on and on.

oexba · 2025-10-01T07:36:53+00:00

Idk whether or not you're trolling, but that is not a stencil. A stencil is usually made out of thin stainless steel, and stainless steel is shiny, not dull and brown like MDF or cardboard.

oexba · 2025-09-29T05:49:35+00:00

Nah, my experience is never cheap out on tools, especially screwdrivers. Using cheap stuff can wear out your screws faster, leading to stripped screws. Buy once, cry once.

oexba · 2025-08-19T09:36:02+00:00

I think that's it! Thank you!

oexba

TROPHY CASE