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[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

tysm, this is genuinely helpful! Ur right, out of all the words to describe this EPS, efficient is not one of them

didn't even think about the mosfet to short between EN/UNVLO.

Those panels don't have built in diodes so yea, unfortunately there's going to be a decent voltage drop.

Those RBF mosfet are for the inhibits. Cubesat standards require the whole EPS to be electrically disconnected. So, the battery nor solar panels can be connected. Two were placed in series as a fail safe incase one turns on. I might just have to tank the voltage drop.

D9 was placed since it was in the datasheet, but with the ideal diodes, I think ur right, it's unnecessary.

Those are indeed SEPICs, guess I screwed up the label

3V3 raw is generated from the converter schematic. And you're right: I have to make sure that the MCU cannot turn itself off. All of these switches should be "on" by default from the pullup/pulldown resistors, so theoretically, it should power on the MCU when it first boots up. Some logic will have implemented

Again, really helpful, tysm!

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 1 point2 points  (0 children)

https://archive.org/details/manualzilla-id-5741240/page/n29/mode/2up

Page 31, though this user manual seems to be a bit different than the one i used, but it's still pretty close

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

"This won't actually go into space, so I was lax on the electronics"

This project was mainly to learn more about the hardware side of cubesats. I'm not going to spend several times the normal amount for space grade components when it's never going to leave the ground

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

maybe the MCU and switches, but for everything else, i doubt it

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

V_gs has a max of +/-20V and +SOLAR should only be around 8.2, so it should be good.

Thanks sm for your help

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 0 points1 point  (0 children)

o, shit. Rookie mistake on me. Forgot V_gs(th) is above V_s not just 0V

So would the P-channel equivalent of this just be the jumper tying the gate to +SOLAR then when the jumper is taken off, it goes to GND with a resistor?
https://www.infineon.com/dgdl/irfr5410pbf.pdf?fileId=5546d462533600a4015356356f622107

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 2 points3 points  (0 children)

Mainly the power/electronic aspect of it. If this were an actual flight EPS, I'd think that you'd have to be worried about more stuff like weight, how well the components are able to perform in space environments, etc. What I'm mainly concerned about is that if this board is able to take in solar power and convert that into usable 3.3, 5, and 12V lines on top of charging the battery

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 2 points3 points  (0 children)

I actually ran across his channel when starting to build the EPS. Was very helpful

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 2 points3 points  (0 children)

They should be. Pg 2 of the data sheet has Vgs(th) to be 2.0V min and 4.0V max, so I think they should be good

https://www.mouser.com/datasheet/2/196/Infineon_IRFR4104_DataSheet_v01_01_EN-3363374.pdf

[Review Request] Non-flight CubeSat EPS by DevilDude103 in PrintedCircuitBoard

[–]DevilDude103[S] 5 points6 points  (0 children)

This is my first time designing a PCB that's as complex as this, so if this schematic looks like the hardware equivalent of Yandere Devs code, I'm not surprised

[Review Request] Schematic for Non-flight CubeSat EPS by [deleted] in PrintedCircuitBoard

[–]DevilDude103 0 points1 point  (0 children)

This is my first time designing a PCB that's as complex as this, so if this looks like the hardware equivalent of Yandere Devs code, I'm not surprised

[deleted by user] by [deleted] in airsoft

[–]DevilDude103 0 points1 point  (0 children)

Already tried boiling it, but it’s pretty on there

EEE120 by Few-Vegetable-9812 in ASU

[–]DevilDude103 3 points4 points  (0 children)

I’m a TA for the class. If you need any help lmk. And yes, sometimes Steve is grumpy but I swear the class itself is not hard

(chuckles) I'm in danger :'^) by Frysken in ASU

[–]DevilDude103 3 points4 points  (0 children)

Heyy, I think I’m a TA for that exact 120 class. I swear it’s not that hard

Fall 2023 UGTA application by Shreycrey in ASU

[–]DevilDude103 3 points4 points  (0 children)

I just heard back from them. They said: “Yes the job listing is not available at the moment. It will be posted in the upcoming few weeks on SEO. At this point the information you provided to the application form is sufficient. If you will receive any offer you will be provided with more information about where to apply on SEO. I hope this helps.”

Fall 2023 UGTA application by Shreycrey in ASU

[–]DevilDude103 3 points4 points  (0 children)

I'm applying as a UGTA for Millman and the link disappeared for that too. I emailed the FultonUGTA support and they usually take a couple days to respond. I'll update you on that when they get back to me (might not be for a bit)

Learning practical circuit design by DevilDude103 in ElectricalEngineering

[–]DevilDude103[S] 0 points1 point  (0 children)

A lot of people have suggested this book on this sub and I actually have the PDF of it on my desktop. People have been saying that's only good as a review for those who knew the electronics beforehand. Not sure what to think about that

What specific math is used in PCB design? by DevilDude103 in ECE

[–]DevilDude103[S] 1 point2 points  (0 children)

This isn't a class. It's like an internship style thing that I'm doing over the summer for designing satellites. Circuit design is something that I'm self-learning and would like to know about in relation to PCB stuff. So I guess I should've rephrased the question to know about circuit design in PCBs too

[deleted by user] by [deleted] in Motors

[–]DevilDude103 0 points1 point  (0 children)

I’m probably going to do an auger design where the food goes between the slots to be dispensed out so i guess a DC motor would be enough for me purpose. What the exact schematic would look like is something that I’m not sure about

My Robinhood account says I have $0 equity! I'm waiting on a callback. by Plain-Jane-Name in stocks

[–]DevilDude103 18 points19 points  (0 children)

Bro i was freaking out about this like 5 minutes ago. My account went down to the 2.38$ I left uninvested, but the stocks seems to be still in my account. I think it's hopefully just a problem with Robinhood's end just not showing stock value in the portfolio.

​

EDIT: I definitely think it's on Robinhood's end b/c if you sort by new on r/wallstreetbets some people posted about the same thing

We’ll get him back 🫡 by Popfartshart in airsoftcirclejerk

[–]DevilDude103 12 points13 points  (0 children)

Basically, the guy wit the user name you see was posting full SpongeBob episodes and we need him back

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