r/AskTechnology

This may seem stupid, but I was wondering if using one would work for a very specific purpose. Hear me out.

I use a key card to access a building, and I always have to keep it on its own, because if I put it in my wallet with other cards and hold my wallet up to the reader, it won’t identify the key card and won’t open the door. (My wallet isn’t RFID-blocking.)

I was thinking, maybe if I put an RFID-blocking card in between my key card and the rest of my cards, then I could always hold the same side of my wallet to the door (the side that has the key card in it with the blocking card behind it) and that would “block” the reader from identifying all my other cards. So that way I could keep my key card in my wallet.

This might be totally off. Again, I have no clue how they work. But in my head I feel like it makes sense.

My parents are both in their seventies, but are still driving (a single car) out of necessity. They live in a medium-sized city in the LA area, but hardly ever go far (almost always for shopping and church or visiting nearby relatives).

So I’ve gotten concerned about what could happen as they drive, and I’m really hoping to get them a dashcam. So here’s my question: are there dashcams out there that require practically no intervention? Like the driver gets in, turns on the ignition, and the dashcam starts recording; and when they get to their destination, the driver turns off the ignition, and the dashcam stops recording. If an incident happens, all they would need to do is pull out the SD card.

Preferably, I would like the installation to be doable non-professionally (my brother and I are fairly tech-savvy and would most likely be able to come over and install the dashcam). And of course, the less expensive (but without compromising our wants), the better. Both front and rear would be ideal, but I think I would be okay with just the front.

Any recommendations (and links) would be appreciated. Thanks in advance!

Howdee all, im wondering if anybody knows of a stereo or radio of some description that is an all in one system meaning no detachable speakers that has internal storage for storing music audiobooks etc it cannot have any type of wireless connectivity like wifi or Bluetooth and cant be an ipod or mp3 player type thing. Think clock radio with inbuilt storage that can playback saved audio files music audiobooks etc?

I am looking for a gadget that would allow me to record a phone interview. My phones are Android.

I do not mind the periodic beep to alert the other side that a recording is taking place or a disclaimer at the start of the conversation. What is important is that the final recording is "clean" so that I can have it transcribed accurately.

As I have a number of phones, I was thinking of a Bluetooth device which would pair with the phone on one end and pair with my car or headphones at the other. Do these exist?

The gadget must work with Android phones. I specify this because there seems to be a device for IOS phones that taps into a component and records through induction - reviews seem to state that on Android it is pretty much a hit and miss because the components are set differently.

Getting them non waterproof will guarantee I'll drop them in the sink. Trust me. My stupidity finds a way.

Also I wanna use it in the shower or when swimming.

My techy mate said waterproof have worse sound quality than non waterproof. Is that true?

If non waterproof sounds better I will risk it.. and cope in the bath ig.

(im 152cm only) i currently use a 15.6inch msi prestige 15 a11sc n its already very heavy. the charger is also insanely huge and heavy compared to my old laptops n i get back aches carrying them daily along w my other stuff to n fro school which is more than an hour away. after researching some recommended me to use GaN 100w with a 100w usb-c to c wire.

Wanted to ask others who have more knowledge in this field if it wld be a suitable substitute to the given charger before i invest since its quite expensive for me ? (pls no malice, simple seeking suggestions n knowledge ! )

I need help. Ive got a samsung 23 ultra. It foes have a crack coming from the left side of the screen but it hasnt seemed to have affected anything else. But yet every once inawhile my phone screen will just shut off without notice and it wont turn back on gkr atleast a minute. And when i try to turn it on it flashes briefly very dark and my finger print sensor seems to go red. It seems like its glitching out but my updates or up to date and the svreen doesnt seem to have any other issues. Please help.

My computer idea

So a lot of people have been talking about new ISO‘s since micro slop and Apple has been putting a lot of bunch of stuff in there computers, and I really had this little idea to see if it would actually work, but I wanted to run it with you guys, so in my mind, I wanted to build a qubes OS that has a built-in kali OS and within that OS has a built-in parrot OS, In my mind qubes os is a bunch of vm’s so you could probably upload an iso to act as a vm, and kali os being the iso, within it is a option in the firmware settings to try/install iso’s and the third one being parrot os, if this is technically possible can anyone run it with me to make it on my computer? Thanks

Some City near out city,is having a daily 2 hour electricity outrage,and they don't have electrity for 2 hours.im wondering,do cameras just stop working when there's no electricity?and if you look at some of them,they just have a black screen with some words on it when there's no electricity.so does that mean they aren't recording or what?.

my device suddenly put notifications of: "This device doesn't support this SD Card. Tap to set up in a supported format". I didn't know what happened and why it suddenly acting like that, I don't have extra sdcard and device/laptop to check if my device or the sd card are the problem. Do you think it's corrupted? Should I reformat it?

I bought an MP3 player a while ago and it worked fine. But now when I’m trying to add more music I can’t find it on my windows laptop???

I already tried changing cords, ports and resetting things. I know it’s connected because it’s being charged by my laptop. But the notification on the MP3 player isn’t showing up, as well as not appearing in my laptop files.

Both my laptop and MP3 player appear to be working fine.

I’m not sure what changed. Any other trouble shooting tips is appreciated.

I’m looking for an external disk drive to play dvd’s and blu-rays on my laptop. I’ve looked at so many that have horrible reviews so I was wondering if anyone has any recommendations or advice?

I recently upgraded from an iPhone 15 to a newer model because my 15’s battery was dying ridiculously fast and also had a pretty gnarly crack in the corner (plus, it was also just really laggy and I kept finding apps I didn’t download or apps I had deleted previously but somehow became redownloaded, both of which really started to sketched me out so I just cut my losses for my own peace of mind).

I’ve been looking online to see how doable diy iPhone repairs are because I’m interested in seeing if I can replace the battery and screen myself. Not for any monetary reason, just more so as an exercise to see if I can manage it.

Figure while I have a device to practice on I might as well. Either that or it’ll continue to occupy the storage box with my other defunct/obsolete electronics from years past.

I’m still fishing around online for info, watching tutorials and the like, but I was curious to hear from anyone who’s done any DIY repairs in apple electronics before I start spending money on the tools needed. Any tips and/or cautionary tales?

Thanks!

question: should I buy something like a good storage device like ssd or a good system like m4 mini (although I'm getting a used one plus more expensive than what it launched for)

my concern is I don't wanna pay extra in coming months or years for things which I can buy today and can use in future.

for context: I'm a software engineer have 1 macbook air M2, office macbook m2 pro, a PC with intel i5 9th gen, gtx1660TI and 12 gb ram with 500gb ssd and 2tb HDD.

I've always been socially anxious when it comes to phone calls so answering a number I don't recognize was already something I hated doing. I'd usually stare at it for a few seconds convince myself that if it's important they'll leave a voicemail and let it ring out. The amount of spam calls I've been getting lately has basically reinforced that habit. Now I don't even consider answering. The annoying part is every once in a while it actually is something important, and I only realize after listening to the voicemail.

I know avoiding calls isn't exactly solving the problem especially when half of my hesitation comes from not knowing whether it's a real person or another spam call. Has anyone actually found a decent way to filter this stuff so you can trust your phone again? Or does everyone just live on "if it's important they'll leave a message" now?

Hey guys, somehow in my early 30's, I've found myself back home in my parents place, box room (thanks government) where I grew up and it's packed. Lot of it is theirs, but I found a ridiculous amount of old consoles, cables , some I can identify, others I can't, cables for old consoles etc. Plus, I found my N64 for example which is missing a power cable but should work otherwise, ps1 and ps2 cables but without the console, controllers and games for various devices, N64 (Which I might keep), PS1 games, gamecube, PSP and so on.

Obviously because I'm missing parts, I can't test em, otherwise I'd go to Gamestop or something, so what should I do with all these cables, games, consoles etc.? Currently in a rural part of Ireland so if it's all just junk. How do I dispose of it all? Assuming anything is worth anything to anyone, I'll keep it but if not, where do I go to dispose of it?

P.S. Tonnes of old phones as well. Can't see any electronics store wanting to go out of their way to dispose of em. Also, I'm not really looking for money but maybe the cables have metals that someone would take etc.?

Thanks!

Hello techies! I live in a one-story, two bedroom apartment. The things we use wifi for in my home are one TV, 2 Chromebooks, 1 cell phone, and 3 tablets. We have Verizon Fios, and I recently upgraded us to 1 Gig speed. The 1 gig upgrade came with a free wifi extender device.

My question is, do we have a real need to use this? I always thought those were for larger homes. Like maybe you put it on the second floor of your house because the internet is more laggy up there. In a home this size, would it serve any real purpose?

Thanks!

Endless Sphere: A 36V battery generates exactly 77.78% (approximately 78%) more heat than a 48V battery when delivering the same power output because resistive power loss is inversely proportional to the square of the system voltage, or: P ^(loss) = 1/V^(2) . This mathematical relationship remains true regardless of the duty cycle, provided both systems are regulated to deliver the same average power output to the load.

To give you an example: 36V rated motor, 500 rated Watts, 90 kV, 3250 rated RPM (around 400 PRM no-load). The motor has a 9.85:1 internal reduction and and a maximum 3.25:1 external reduction (dual chain 16T freewheel on output shaft and 52T chainring). For an ebike mid-drive, the pedal crank rpm is typically 60-80. So for the middle: 70 x 3.25 x 9.85 = 2240 motor rpm. That's not bad if it's 3250 rated rpm.

However, here is where it does get bad. There is a 3rd stage for reduction, but it's not really reduction, it's overdrive. If someone has a 40T chainring and an 11-40T cassette, every cog (gear) past the first one will be overdrive and will add load to the system. So for example if it's in the 16T cog, that's 2.5x load since it needs to turn the rear wheel 2.5x faster than 40/40. Now you are down to the equivalent of 2240 / 2.5 = only around 900 motor rpm. That inefficency will be lost as heat. Overvolting to 48V increases motor rpm 33% so now the example would be the equivalent of 1200 rpm. Better, more towards the 4000 no-load RPM and substantially less heat generation than 900 rpm because efficiency is actually the square of the difference.

So why not simply overvolt the motor, even cheap plastic wire housing is rated for 100+V and most controllers are 36/48V anyway.

What if you scratch one RAM pin? And if its a RFU pin vs actual needed pin?