OT: Where have the bugs gone?

Started by Steve Wilson in sci.electronics.design1 week ago 61 replies

Years ago, I could not drive anywhere without the front of my car getting splattered with bugs. Now there are none. At sunrise, there used to...

Years ago, I could not drive anywhere without the front of my car getting splattered with bugs. Now there are none. At sunrise, there used to be a beautiful chorus of birds welcoming the day. Now there are none. At dusk, there used to be clouds of birds somehow twisting and turning in synchronization without hitting each other. Now there are none. This appears to be a widespread pro...


Spad spice model

Started by George Herold in sci.electronics.design1 week ago 1 reply

So I'm trying to make a model of my spad, It's a reversed biased photodiode biased (about 10 V) above the avalanche break down voltage. (about...

So I'm trying to make a model of my spad, It's a reversed biased photodiode biased (about 10 V) above the avalanche break down voltage. (about 120V) When a photon hits the spad (or from dark counts) I get a fast pulse that discharges the ~2pF of spad capacitance. I measure those pulses. Here's a 'scope shot of pulse with 500k ohm quench R and 500 ohm sense R


WiFi Connection Quality

Started by Anonymous in sci.electronics.design1 week ago 62 replies

My wifi connection seems to be working worse than usual. I can connect directly to the WISP modem and get a good connection. Connecting to the...

My wifi connection seems to be working worse than usual. I can connect directly to the WISP modem and get a good connection. Connecting to the router by cable seems to get a good connection. By "good" I mean the ping times to 8.8.8.8 are consistently in the 20's or 30's of ms. When on the wifi connection lately the ping times are up to 500 ms and beyond 20 to 30% of the tests.


GPS module wanted for timing.

Started by Clive Arthur in sci.electronics.design1 week ago 39 replies

Hi I need a GPS module which will give me: ...an accurate 10 MHz clock output ...an accurate 1 second pulse output ...a serial interface to...

Hi I need a GPS module which will give me: ...an accurate 10 MHz clock output ...an accurate 1 second pulse output ...a serial interface to read UTC. (Position isn't important. I know where I am.) I know there are probably dozens of modules which will do this, but I have no experience in this area, so any advice would be welcome. UK supplier preferred but not strongly. Will need...


Electric police vehicles

Started by bitrex in sci.electronics.design1 week ago 14 replies

A couple police departments have started fielding Chevy Bolts as patrol cars/interceptors and it seems early impressions have been positive, the...

A couple police departments have started fielding Chevy Bolts as patrol cars/interceptors and it seems early impressions have been positive, the battery charge can easily last a full shift, sub 6 second 0-60 times for pursuit, don't need to burn fuel keeping the lights and accessories running on work detail etc. They're near completely silent at low speed lets you sneak up on situatio...


Hillarious

Started by Cursitor Doom in sci.electronics.design1 week ago 35 replies

Florida Bitchfest: https://tinyurl.com/yazaxops Wimmin! :-D -- This message may be freely reproduced without limit or charge only via...

Florida Bitchfest: https://tinyurl.com/yazaxops Wimmin! :-D -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through other protocols, whether for profit or not, is conditional upon a charge of GBP10.00 per reproduction. Publication in this manner via non-Usenet protocols constitutes acceptance of this co...


Ecosystems across Australia are collapsing under climate change

Started by Anonymous in sci.electronics.design1 week ago 83 replies

"Our research, recently published in Nature Climate Change, describes a series of sudden and catastrophic ecosystem shifts that have occurred...

"Our research, recently published in Nature Climate Change, describes a series of sudden and catastrophic ecosystem shifts that have occurred recently across Australia. These changes, caused by the combined stress of gradual climate change and extreme weather events, are overwhelming ecosystems’ natural resilience." This is only going to get worse, and rapidly. West


LTspice and noise analysis

Started by Jeroen Belleman in sci.electronics.design1 week ago 5 replies

After it got pointed out to me that in LTspice it was possible to tag resistor values with the 'noiseless' keyword, I reckoned it should also be...

After it got pointed out to me that in LTspice it was possible to tag resistor values with the 'noiseless' keyword, I reckoned it should also be possible to specify the temperature of a resistor. Indeed, it is possible to assign a value of '50 Temp=-196' to a resistor and to get the correct thermal noise contribution for that resistor in the noise analysis. I couldn't find any mention of i...


HDMI Switch

Started by Jim Thompson in sci.electronics.design1 week ago 17 replies

I'm looking for an HDMI switch, 2-IN, 1-OUT BUT with IR remote control so I can assign a button on an existing remote. Seems should be easy...

I'm looking for an HDMI switch, 2-IN, 1-OUT BUT with IR remote control so I can assign a button on an existing remote. Seems should be easy to find, but everything out there seems to be over-kill. Any leads/links? Thanks! ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations ...


Hamming ECC

Started by bitrex in sci.electronics.design1 week ago 11 replies

Do you use Hamming/Reed Solomon/etc. codes to check for data errors when writing/reading e.g. large battery-backed SRAMs or Flash memory that's...

Do you use Hamming/Reed Solomon/etc. codes to check for data errors when writing/reading e.g. large battery-backed SRAMs or Flash memory that's are used for non-volatile storage of user data for significant periods of time (couple weeks)? Or do you find single-bit errors in RAM reads to be not much of an issue in practice? I'm considering writing the external memory in pages of say 8 by...


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