zener!

Started by John Larkin in sci.electronics.design3 days ago 24 replies

https://www.digikey.com/en/products/detail/microchip-technology/JANS1N4102DUR-1-TR/13995295 Somebody must buy them. -- If a man will...

https://www.digikey.com/en/products/detail/microchip-technology/JANS1N4102DUR-1-TR/13995295 Somebody must buy them. -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon


dual-range TIA circuit

Started by Anonymous in sci.electronics.design4 days ago

This is an improved version of the one in the X-chapters. The dumb summer should be smarter to optimize s/n. If we digitize V1 and V2 and do...

This is an improved version of the one in the X-chapters. The dumb summer should be smarter to optimize s/n. If we digitize V1 and V2 and do some tweaks, that should work. BFT25 is sadly EOL. Its c-b junction is about the best diode anywhere. I'll have to find a comparable part somewhere. Version 4 SHEET 1 1192 680 WIRE -16 -304 -64 -304 WIRE 32 -304 -16 -304 WIRE 288 -304 256 -304 ...


They came for the otters first and I said nothing-

Started by Brent Locher in sci.electronics.design4 days ago 3 replies

https://www.tampabay.com/news/health/2021/10/14/panthers-skunks-otters-primates-get-new-covid-19 -shots-first-at-zootampa/

https://www.tampabay.com/news/health/2021/10/14/panthers-skunks-otters-primates-get-new-covid-19 -shots-first-at-zootampa/


Skybuck's Purchase Considerations for possibly new PC in 2021 or 2022.

Started by skybuck2000 in sci.electronics.design4 days ago 12 replies

Current hardware analysis for Skybuck Flying: Tower PC: Socket 939 motherboard NVIDIA NFORCE4 chipset AMD X2 Dual Core (2 x 2.0 GHz) = 4.0...

Current hardware analysis for Skybuck Flying: Tower PC: Socket 939 motherboard NVIDIA NFORCE4 chipset AMD X2 Dual Core (2 x 2.0 GHz) = 4.0 GHz total gigahertz ("horse power") CORSAIR DDR1 4 x 1 Gigabytes = 4 GigaBytes total ram. WINFAST PCI Express 1.0 = 250 MegaBytes per second = system speed HITACHI SATA harddisks = Roughly 100 Megabytes per second peak or 2 kilobytes per s


Weird/smelly problem with Skybuck's DreamPC2006 and CPU fan not spinning

Started by skybuck2000 in sci.electronics.design4 days ago 29 replies

I did the following: 1. Replaced winfast motherboard with backup winfast motherboard. The backup motherboard is same model yet strangely...

I did the following: 1. Replaced winfast motherboard with backup winfast motherboard. The backup motherboard is same model yet strangely enough missing one ethernet port, it only has one, while the other has two, also firewire pins missing but ok. 2. Put some new artic silver 5 on the cpu. 3. Struggled to get the scythe ninja heatsink on it, pulled it off then put it back on ? I know thi...


OT: Walgreens closing 5 San Francisco stores due to shoplifting

Started by John Doe in sci.electronics.design4 days ago 41 replies

The cannibal left wins again!

The cannibal left wins again!


OT: "Stellarium"

Started by Don Y in sci.electronics.design4 days ago 9 replies

We have delightfully dark night skies -- so watching meteor showers is a thrill! But, it's annoying to have to hunt down information as...

We have delightfully dark night skies -- so watching meteor showers is a thrill! But, it's annoying to have to hunt down information as to where to watch (i.e., where the radiant will be at particular times of the night). There's a FOSS app -- Stellarium -- that is remarkably detailed in its modeling of the heavens. It's also amusing to see an application that is almost entirely "math ...


Volteq HY series bench supply, wrong current display

Started by Joerg in sci.electronics.design4 days ago 17 replies

With a lot of Sherlock Holmes sniffing I could find it but the schematics for those things are...

With a lot of Sherlock Holmes sniffing I could find it but the schematics for those things are horrid. https://www.audio-thai.com/index.php?topic=15325.0 I have the HY3030EX (30V/30A). The problem is that it shows arbitrarily high currents that aren't there and they are proportionate to the set voltage. Shows 11A at max voltage without any load. Of course, nothing becomes hot because...


A Pentagon official said he resigned because US cybersecurity is no match for China, calling it 'kindergarten level'

Started by Fred Bloggs in sci.electronics.design4 days ago 78 replies

"We have no competing fighting chance against China in fifteen to twenty years. Right now, it's already a done deal; it is already over in my...

"We have no competing fighting chance against China in fifteen to twenty years. Right now, it's already a done deal; it is already over in my opinion," he said. It's over for this corrupt country full of low caliber people and a government populated by career liars and cheats who can't accomplish anything. When it starts to go, the US will fall as fast as Afghanistan. https://www.businessins...


Captain Kirk Cried...

Started by Anonymous in sci.electronics.design4 days ago 54 replies

Bill Shatner didn't fill his diaper on the upshot. Taking a look back at Earth made him cry though. I can't believe how short the...

Bill Shatner didn't fill his diaper on the upshot. Taking a look back at Earth made him cry though. I can't believe how short the flights are. The booster was back on the ground by the 4 minute mark, and they were back at 10,000 ft after only eight. I don't like the hard landing method though. Can't pinpoint parachute drift numbers, so no padded landing zone.


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