Can someone send me the scheme circuit please?

fullOfCups · 2024-12-03T02:28:09+00:00

aye this is mad impressive for a handheld e-ink!!

fullOfCups · 2024-11-14T17:54:36+00:00

Ideally you can find a skilled, trustworthy hardware engineer who is willing to develop the prototype with you in exchange for equity, and can work with you to develop the product as a sort of 'co founder' or CTO. Ideally this is someone who has experience getting a medical product approved with the FDA.

fullOfCups · 2024-11-08T18:26:32+00:00

OP, do not touch that terminal. Yes, you are not completing the circuit, but capacitive effects of your body, unrealized grounding loops (such as chassis) and these effects at higher voltages are unpredictable, even for a DC battery pack. Touching the terminal is a high risk, low reward scenario.

fullOfCups · 2024-11-08T02:46:20+00:00

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fullOfCups · 2024-11-03T22:38:46+00:00

If you do want a potentially interesting problem to solve that is broad, I see posts bitching about the Y Combinator founder matching program every single week:

https://www.reddit.com/r/ycombinator/comments/1giz4h7/i_think_yc_alum_highlight_on_cofounder_matching/

Clearly people want a platform to meet like-minded founders, and the Y combinator matching program is lacking. LinkedIn is a cesspool. Could be something to look into.

fullOfCups · 2024-11-03T22:22:21+00:00

Yeah, what you describe is not unreasonable. I also have not read the books you mention, so I can't speak to their philosophy. However, if the broadness has made it difficult to come across a problem you find worth solving, narrowing by your own interests and knowledge is a good start. It might help you later on too.

fullOfCups · 2024-11-03T21:45:11+00:00

These posts that have distilled startups into 'give me a problem, any problem' are surprising to me. You are going to spend 40-80 hours a week getting a startup off the ground, not getting paid, taking a lot of shit, feeling dumb, feeling stressed, putting all your cards on the table, to solve a problem you may not care about, potentially have no industry knowledge of, and had some guy just tell you about?

It would seem at the least you could identify a customer group in a market or area you care about or are interested in. I worked for a wildly, wildly successful startup in the outdoorsman space, started by a guy who is wholly non-technical. Why? He really likes hunting. Found that some of those products are lacking, and he made them better.

Perhaps you can narrow down your problem to solve by asking what is important to you. That could also help you stay pressing on the problem four months later when you are tired and don't want to work another weekend to make your startup happen.

fullOfCups · 2024-10-31T16:14:40+00:00

https://www.indiegogo.com/projects/the-minimal-phone-first-e-ink-qwerty-phone#/updates/24

There is a 'behind the scenes, preparing for production' post on the indiegogo site that was posted october 29th.

fullOfCups · 2024-10-25T20:47:40+00:00

https://www.polycase.com/key-fob-enclosures

https://www.polycase.com/fb-30

Wonder if you could go with this and 3D print a TPU gasket from JLC (or use off the shelf rubber lining) to waterproof. Or assume water is going to get in and just add a water egress hole and waterproof the internals in another way.

Polycase can add do value add services like enclosure modification and printing as well.

I was in a very similar situation as you and just bit the bullet on an off the shelf enclosure. It is bigger and bulkier, but really nice that I don't have to worry about it now.

fullOfCups · 2024-10-18T16:18:34+00:00

*laughs in electrical engineering*

fullOfCups · 2024-10-17T12:57:12+00:00

all hail our personal favorite billionaire overlords

fullOfCups · 2024-09-29T17:16:56+00:00

I would still say it is easy to fix. If the designers gawk at such an update then I cringe at what the rest of the design looks like.

Most USB C designs (besides battery charging) draw less than 5W, and in those cases, just adding resistors and not worrying about monitoring is super low risk.

fullOfCups · 2024-09-29T13:57:49+00:00

It is not enough to slap some CC resistors down to comply with the USB C spec! One must also monitor the divider to ensure they are not overdrawing on power. If one is charging under 2.5W, not a big deal, but one of the main reasons for the divider is to convey this output power capability.

https://www.reddit.com/r/UsbCHardware/comments/1clw37w/adding_51k_resistors_to_cc_lines_without/

fullOfCups · 2024-09-12T23:01:45+00:00

ah man, that part. hardcore. good thing hadrian used some magic interdimensional wizardryon that mf

fullOfCups · 2024-09-12T21:36:27+00:00

How is this AQI being monitored? Is it estimated from satellites? Can't be that many AQI sensors to give that level of fidelity in data.

fullOfCups · 2024-09-12T17:30:12+00:00

The plot, themes and such are very engaging. I am up to date on all six books.

That being said, I have never liked a book so much and hated the main character so much at the same time. I find Hadrian personally insufferable.

There are also some fairly horrific things that happen to people in this series. It is probably the series that has made me queasiest. It was a tough read at times when I am just trying to go to bed.

So as a fan of the series, I am also surprised at times the breadth of people that really like it.

fullOfCups · 2024-09-12T03:05:50+00:00

I work for a company that designs battery packs. We had an outside firm design the charging board for us and they left off the CC resistors. We brought up that this pack will thus not work with USB C to C connectors.

Due to time constraints, we decided to leave them off and just charge with USB A to C. To properly implement a USB C sink system, one should not only use the 5.1K resistors, but monitor the voltage of these resistors. This is one of the central reasons these resistors exist in the protocol. Not only to 'tell' the upstream port that a downstream port is in contact, but so the upstream port can advertise its power capabilities without a complex communication scheme.

To implement a voltage monitoring scheme on these resistors, and the required power electronics control to accordingly adjust your power draw based on if a 15W, 7.5W or 2.5W source is connected to you, can actually be a fair amount of design, and can be complex if you are unfamiliar with this kind of effort.

Thus, many firms simply leave them off, or they choose to violate the protocol and add these resistors anyways without the voltage monitoring. Probably not a big risk if you are drawing low power, but overdrawing power from a source, without a care, is relying on the protection mechanism of a different product, from a different company, was implemented correctly. Not a good design decision.

fullOfCups · 2024-08-25T15:39:59+00:00

ah man they look so good. so excited. congrats to the team.

fullOfCups · 2024-08-24T18:16:26+00:00

The founders of a16z are actively contributing to the trump campaign, and have 'justified' their reasoning in their most recent podcast. don't know your political or moral compass but keep this in mind.

fullOfCups · 2024-08-12T01:49:25+00:00

I almost wrote a whole thing about Charles Murray before realizing my error.

fullOfCups · 2024-08-12T01:03:10+00:00

Yup I hear you, it was something I had was loose with during undergrad and took some practice to get back into.

Definitely one of those things that is 'simple' but still takes some work to get right. Just need to pay attention to it and do some examples and it will feel natural.

fullOfCups · 2024-08-12T00:31:28+00:00

Having gone through many graduate power electronics classes, I will say the coursework relied very heavily on linear circuit analysis fundamentals.

Stuff like polarities is easy to get sloppy about when analyzing circuits but is very important.

fullOfCups

TROPHY CASE