|
2d
|
|
revised |
Would a terraformed planet have no fossil fuels and if so, what alternates would be available? added 4 characters in body |
|
2d
|
|
revised |
Would a terraformed planet have no fossil fuels and if so, what alternates would be available? added 417 characters in body |
|
2d
|
|
answered | Would a terraformed planet have no fossil fuels and if so, what alternates would be available? |
|
Apr
23 |
|
awarded | Yearling |
|
Apr
23 |
|
awarded | Yearling |
|
Apr
12 |
|
comment |
Bidirectional pairs in ethernet to a single digital input and output interface Sounds like you're trying to "bit bang" ethernet...? It is a thing you could do in a fast micro for 10M (as it's just digital), but challenging at 100M (high-speed and tri-level analog), really not recommended at 1G (not only is it 5-level analog, but TX and RX use all wires simultaneously via DSP echo cancellation). Just about everything supports 10M (assuming the application isn't too bandwidth-hungry) so doing 10M protocol decoding entirely in software is hard, but possible. P.S. it's extremely unlikely any micro can handle software decoding at Gbe speeds... |
|
Mar
24 |
|
awarded | Popular Question |
|
Mar
17 |
|
answered | PCB MIFA Mismatch: 50R (ideal) vs. (22+j42)R (layout) |
|
Mar
14 |
|
awarded | Notable Question |
|
Feb
20 |
|
awarded | Yearling |
|
Feb
20 |
|
awarded | Yearling |
| 2025 | |||
|---|---|---|---|
|
Dec
11 |
|
answered | Do components packaged in QFP with fewer than 32 leads exist? |
|
Oct
14 |
|
awarded | Popular Question |
|
Oct
3 |
|
comment |
Inductor---how long can the rated current be exceeded for? Diodes tend to be the toughest of all semiconductors (as they're just solid bricks) but they DO still have limits. Check the datasheet for the part in question, there's likely to be an Ifsm rating (around 20-50x rated current). Treat that as the absolute max current limit, beyond that you might run into either vaporized bond wires or localized melting of the die (in terms of speed, electricity >>>>>> heat diffusion and hot spots have lower Vf which means more current which means more heat and... well, you get the idea). Best to avoid needing a power zener altogether |
|
Oct
1 |
|
comment |
Inductor---how long can the rated current be exceeded for? you just won't get the rated inductance during a 4x over-current. You might get 50% you might get 0.5% it depends on the properties of the core material - iron handles bigger fields and rolls off more smoothly than ferrite but is (much) more lossy at higher frequencies while mu-metal... is the wrong material for this application |
|
Oct
1 |
|
comment |
Inductor---how long can the rated current be exceeded for? milliseconds in a one-off is probably fine for a couple times overload - I imagine most decent inductors can handle a single 10x current burst with ease (except for maybe little MLC ferrite beads, they might vaporize). When you're in the "amp" range, inductors are usually pretty tough (they are solid bricks of metal after all). |
|
Oct
1 |
|
comment |
Inductor---how long can the rated current be exceeded for? Your main limiting factors are (in decreasing likelihood) core saturation, thermally induced degradation (bursting into fire), and my favorite, flux-induced rapid unscheduled disassembly (it exploded). See, magnetic cores are hundreds to thousands of times better at ... "conducting" ... magnetic fields than air, but they have a limit (saturation current), exceed it and the inductance starts to plummet, eventually dropping to that of an air-core inductor (a 1000x drop in inductance is probably not what you want). BUT, provided it doesn't overheat, it should be ok (if not, add an inrush NTC) |
|
Sep
25 |
|
comment |
What is the Longest Time I Can Set an Astable 555 Timer? I have been able to reliably get delays on the order of 30s from a 555 (albeit with abysmal accuracy). I needed 10M resistors and a few tens of uF of chip caps. Just FYI, at these timescales CMOS 555s and ceramic/film capacitors are mandatory as the RC charge/discharge currents are minuscule and leakage can be a major headache. If you have to avoid a micro for whatever reason (like I did) but counter ICs are ok, then Carl's solution of a 555 feeding a counter/divider (or several) can get you any delay you like (although a crystal + counter is probably more accurate) |
|
Sep
19 |
|
answered | Is there a substance that passes through gasses, but reacts violently (explosive) when confronted with solid matter? |
|
Sep
12 |
|
awarded | Yearling |