Activity for Lundinâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #292265 |
Questions about RF band use, modulation techniques, radio disturbances, FCC approval etc etc are more suited for https://electrical.codidact.com/. When two RF devices send on the same band, there's not as much a physics phenomenon problem as a signal decoding problem. Notably, questions of the nature... (more) |
— | about 1 month ago |
| Comment | Post #284890 |
How exactly is this a question about physics and not about DIY repairs? In order to make this a valid physics question you would at least have to offer some theory of forces, moment, measurements, expected friction and whatever else may be relevant. (more) |
— | almost 3 years ago |
| Edit | Post #283298 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Signal modeling as only digital, only analogue, or as both It's easy enough to find examples. For example RF OOK modulation can be considered "digital" since it only has two states. Yet at the same time we can vary the carrier frequency, which can be considered "analog". Another example is current loops where analog signals are transmitted as current.... (more) |
— | over 3 years ago |
| Comment | Post #283258 |
I agree that this is off-topic, it's far-fetched to even call this applied physics. Should be moved to https://electrical.codidact.com/ where the question is on-topic. (more) |
— | over 3 years ago |
| Comment | Post #280705 |
At any rate you only need some 10-20mA across your heart to risk a heart stop. DC or AC is irrelevant there. The average 230VAC connector in your home is fused to 15A and can deliver quite a current until the ground fault breaker goes. (more) |
— | almost 4 years ago |
| Comment | Post #280705 |
"DC is much safer compared to AC" This probably comes from the idea that if you get 230VAC through your muscles, they would repeatedly cramp and make it impossible to move away from the point of contact. Not sure if it's true but I've heard it mentioned many times. At any rate, that such doesn't matt... (more) |
— | almost 4 years ago |
| Comment | Post #280466 |
Also, I'd be wary about a "post your physics problems" category, it's an open invitation to massive amounts of homework spam. Maybe something more similar to the Challenges category on the Code Golf site? (more) |
— | almost 4 years ago |
| Comment | Post #280466 |
I think this site should probably rather start with making categories for the various fields of physics that are considered on-topic. For example specific category for Astrophysics or one for Applied Physics might make sense. (more) |
— | almost 4 years ago |