Rail-splitting a wall wart

Started by Phil Hobbs in sci.electronics.design1 hour ago 77 replies

So we keep being asked for simple TIAs as incidental parts of our consulting work. They're useful to have around anyway. It's a pain getting...

So we keep being asked for simple TIAs as incidental parts of our consulting work. They're useful to have around anyway. It's a pain getting them to work right if we put SMPSes inside, so we're kicking around the idea of using a rail splitter on our usual 24V wall warts to make +15/-9 or something like that. We'd probably use a TCA0372 and a couple of big caps for the job. Two-wire...


Broadcast distribution

Started by Don Y in sci.electronics.design1 hour ago 4 replies

[This is an edited version of an email I've sent to a few colleagues. Posted here in the hopes that others might have some technical...

[This is an edited version of an email I've sent to a few colleagues. Posted here in the hopes that others might have some technical advice] I've run RG6Q to all of the rooms/likely destinations in the house. Usually, that's 2 per bedroom (for siting options), 3 or 4 for the larger rooms (living room, family room, etc.). Singletons into my lab, back porch, etc. Maybe 18-20 "drops", in t...


U.S. Coast Guard Says to Avoid Loading Electric Vehicles with Saltwater Damage on Ships

Started by Fred Bloggs in sci.electronics.design2 hours ago 22 replies

Saltwater exposure can severely harm Lithium-Ion batteries, leading to a chemical reaction that creates a high fire risk. Records show there...

Saltwater exposure can severely harm Lithium-Ion batteries, leading to a chemical reaction that creates a high fire risk. Records show there are over 7,000 EVs in Lee County, Florida with the potential for damage. “Vessels, ports, and shippers should be aware of this extreme risk and avoid loading EVs with damaged Lithium-Ion onto commercial vessels,” the safety a


Static Electricity

Started by Dean Hoffman in sci.electronics.design2 hours ago 7 replies

There's a TV show called Mail Call. It has a military type narrator. They were showing a helicopter picking up a piece of artillery. It...

There's a TV show called Mail Call. It has a military type narrator. They were showing a helicopter picking up a piece of artillery. It hovers over the artillery while the ground crew attaches it. He said the first thing the crew has to do is ground the chopper to eliminate the static electricity buildup. The rotor blades can pickup 50,000 volts according to the story.


another RF part rant

Started by John Larkin in sci.electronics.design4 hours ago 14 replies

https://www.qorvo.com/products/p/QPD1016 The part could be very useful in wideband/pulse applications [1] but there are no DC curves, no...

https://www.qorvo.com/products/p/QPD1016 The part could be very useful in wideband/pulse applications [1] but there are no DC curves, no capacitances, no Spice models, just the silly load pull cartoons. [1] except for the price of course.


Balloons vs. satellites: Popping some misconceptions about capability and legality

Started by Fred Bloggs in sci.electronics.design6 hours ago 2 replies

My guess is they had about 15 minutes from the time the balloon crossed the shoreline until it reached international airspace. As a...

My guess is they had about 15 minutes from the time the balloon crossed the shoreline until it reached international airspace. As a surveillance tool, the balloon can pick up more detail than a satellite, but the price it pays is the observable area is pretty small. They should have enough ground track data on its flightpath to show us exactly what this thing was seeing. Or maybe th


I finally discovered the mystery behind the black sunspots

Started by a a in sci.electronics.design6 hours ago 6 replies

The mystery of sunspots finally discovered Sunspots look dark, black, since they appear in the regions of magnetic acitivity,...

The mystery of sunspots finally discovered Sunspots look dark, black, since they appear in the regions of magnetic acitivity, ejecting plasma. Ejected plasma gets dilluted, loosing its density, so inductive heating effect takes place in strong magnetic fields, so the ejected plasma, solar corona look brighter, heated by induction. So sunspots can be functionally modelled on the groud...


iowa hills

Started by Simon S Aysdie in sci.electronics.design17 hours ago 4 replies

The iowa hills site has been down for awhile. I don't understand dropbox, but some time ago I did archive the iowa hills sw. I have links...

The iowa hills site has been down for awhile. I don't understand dropbox, but some time ago I did archive the iowa hills sw. I have links but don't know if they work due to my dropbox knowledge: https://www.dropbox.com/sh/hx0djlumvld8dgx/AABQhBu0FNVnhHrEouYbW15Sa?dl=0 https://www.dropbox.com/s/5omz6lopn42x5dc/493?dl=0 https://www.dropbox.com/s/lw485nybbhxov0k/493.gz?dl=0 https://www....


More than a third of animals and plants in the United States are at risk of extinction, according to a report released Monday. chinadaily.com.cn Report: US wildlife, ecosystems disappearing

Started by a a in sci.electronics.design18 hours ago 1 reply

More than a third of animals and plants in the United States are at risk of extinction, according to a report released...

More than a third of animals and plants in the United States are at risk of extinction, according to a report released Monday. chinadaily.com.cn Report: US wildlife, ecosystems disappearing


Nichrome wire

Started by Don Y in sci.electronics.design1 day ago 44 replies

How do I determine the power handling (thermal) capabilities and impact on mechanical strength at specific power levels/temperatures?

How do I determine the power handling (thermal) capabilities and impact on mechanical strength at specific power levels/temperatures?


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