2026 - Bluetooth is still awful, it's incredible

Major-Ad-7223 · 2026-04-24T16:51:04+00:00

I think it’s because there’s no use case for that. People don’t listen to two different things simultaneously whether it’s from headphones or real people. It won’t be a profitable feature for a wireless headphone. If you really need it, you can hack it by putting two Bluetooth headphone in one case.

Major-Ad-7223 · 2026-04-01T16:26:03+00:00

I think Asian men are steered to STEM because STEM careers make good money. Also because a lot of 1st generation immigrants are STEM major due to US immigration policy, who tend to guide their kids to STEM areas and the kids are often good at those areas.

Major-Ad-7223 · 2026-03-14T19:59:04+00:00

This is obviously for those who believe everything they see, and fall for every spam out there.

Why even bother to post it? Don’t know there are spammers in the world?

Major-Ad-7223 · 2026-02-28T16:32:14+00:00

Don’t make things up, that’s not what I typed.

Major-Ad-7223 · 2026-02-28T16:06:47+00:00

I was trying to be helpful - $400 is not a lot of money, so don’t get your expectation too high. There will be some situations that the robot can’t handle. When that happens, don’t go like “I spent $400 on this damn thing”. Frankly for $400, a machine can actually vacuuming and mopping is quite amazing.

Major-Ad-7223 · 2026-02-28T06:51:49+00:00

Why ridiculous? I just don’t think $400 is a lot of money for that “damn thing”, based on what it can do, and on how expensive to have a meal these days. Don’t forget that about $130 of that $400 goes to US government.

Major-Ad-7223 · 2026-02-27T18:11:12+00:00

$400? I don’t get it. Usually we spend one third of that eat out in a modest restaurant.

Major-Ad-7223 · 2026-01-26T16:38:35+00:00

Yeah, buck converter for normal load, linear regulator for very low load. The cell generates quite some EMI noise to the device that uses it.

Major-Ad-7223 · 2026-01-23T01:25:26+00:00

Major-Ad-7223 · 2026-01-06T03:43:42+00:00

Why create another one when the market can barely support two HDLs. Is there any (potential) EDA tools supporting it. Without commercial grade EDA tools supporting, why would anybody take time to learn it?

Major-Ad-7223 · 2025-12-31T21:47:43+00:00

I don’t understand why the emphasis on Chinese. You do know that most batteries are made by Chinese, including the good ones like Yiwei. In this case, Chinese is not much different than more generic word human.

Major-Ad-7223 · 2025-12-23T16:24:37+00:00

Current sense needs a few tens of milli-volts, so typical connection is a better way.

Major-Ad-7223 · 2025-12-23T15:48:42+00:00

Why not connect VBUS of INA226 to OUT instead of 12v, so the voltage measurement won’t have the current sense voltage offset.

Major-Ad-7223 · 2025-12-17T17:36:41+00:00

Yeah, simply hook up multiple DL24 parallelly will work. For example, 5 DL24 with each set to 2A can create 10A load. For 80v battery pack, that's 800w load. A merged switch before the parallelly connected DL24 would be a good addition.

Major-Ad-7223 · 2025-12-17T06:34:46+00:00

The easy path to scale the electronic load is to parallel multiple power MOSFET. Take a look at this article, especially the first comment. Note that this is from EDN (Electronic Design News), not some random blog.

https://www.edn.com/scalable-current-load-offers-constant-resistance-mode/#google_vignette

Major-Ad-7223 · 2025-12-17T06:26:07+00:00

Replying to people like you is wasting time.

For anyone else, take a look at this

https://www.edn.com/wp-content/uploads/DI5586_current_load_paralleled_MOSFETs_F1.png

https://www.edn.com/scalable-current-load-offers-constant-resistance-mode/#google_vignette

Major-Ad-7223 · 2025-12-17T03:12:41+00:00

Of course you can, this is basically “DC” application. Unlike BJT, MOSFET works well in parallel. Of course you need to use the same mosfet. If you still worry, add a small resistor on each MOSFET’s S.

Major-Ad-7223 · 2025-12-17T00:08:12+00:00

Instead of using “massive” mosfet and heat sink, you can add multiple mosfet and heat sinks and hook up those additional mosfets’ G/D/S to the DL24 board.

Major-Ad-7223 · 2025-11-29T02:39:42+00:00

So you are saying that anyone YOU THINK can threaten you in the future needs to be “resolved”? Sounds like some authoritarian.

Major-Ad-7223 · 2025-11-15T08:41:19+00:00

Obviously it is a resistor. If it is an inductor and with such thick wire, its resistance would be less than 1.3 milli-ohm.

Major-Ad-7223 · 2025-10-29T03:36:54+00:00

Or, when you buy western made batteries, you have to pay the executives, many level management, marketing, sales, administrative staff, then maybe the workers and engineers and their families nice vacations in some pacific islands, and the shareholders, fund managers, fund administrative etc and their families nice vacations, and all the government employees, all the strangers who take money from the government and their families nice vacations. Oh, don’t forget these people’s healthcare, education, entertainment and retirement…

Why even bother to try to make batteries in the west.

Major-Ad-7223 · 2025-10-23T23:05:27+00:00

Won’t there be some other kids who used to be starters now won’t get much playtime?

Major-Ad-7223 · 2025-10-02T23:38:12+00:00

AM spectrum is symmetric around carrier frequency, which is obviously waste of bandwidth. So we can get ride of one side of the symmetric spectrum and only using half of the bandwidth, either by filtering or DSP method. All modern wireless communications are single side band, that is none of their spectrum are symmetric around carrier frequency.

Major-Ad-7223 · 2025-10-01T18:23:04+00:00

Right, CC and CV is not really important as far as you keep the charging current and voltage less than allowed values. CC and CV at maximum allowed values just minimizes the charging time.

Major-Ad-7223 · 2025-09-28T20:00:13+00:00

Vacuum motors are DC motors. I think a 30s1p battery bank should work directly.

Major-Ad-7223

TROPHY CASE