a couple of LC filter progs

Started by John Larkin in sci.electronics.design2 weeks ago 31 replies

BESSIE designs LC Bessel filters up to 5th order. LCNORM normalizes or scales filters for new frequencies or impedances. That's always a...

BESSIE designs LC Bessel filters up to 5th order. LCNORM normalizes or scales filters for new frequencies or impedances. That's always a nuisance to do by hand. https://www.dropbox.com/s/syvu0wsx7s9rllk/Filter_Progs_1.zip?dl=0 I hope I got them right. -- John Larkin Highland Technology, Inc lunatic fringe electronics


A guy comes home...

Started by gray_wolf in sci.electronics.design2 weeks ago 1 reply

A guy comes home and his wife informs him that the power has been out all day, so they're going to have to eat out. "But we have a gas stove...

A guy comes home and his wife informs him that the power has been out all day, so they're going to have to eat out. "But we have a gas stove and refrigerator!" he says. "Yes, but we only have the one _electric_ can opener."


Quantum communication between people (iris photon entanglement)

Started by Anonymous in sci.electronics.design2 weeks ago

Once I saw beautifull blue eyes on a girl where the sun was shining in her eyes, the photons were exploding through here eyes like exploding tiny...

Once I saw beautifull blue eyes on a girl where the sun was shining in her eyes, the photons were exploding through here eyes like exploding tiny blue crystals. (I wrote about this story once before). People also talk about "contact with another person" or lack thereof in autistic persons. This contact is actually described in the dictionary as (sort of) "telepathy". Autistic persons m...


Prototype PCB manufacturers?

Started by rangerssuck in sci.electronics.design2 weeks ago 14 replies

I'm looking for a new source from which to purchase prototype PCBs. I've been buying for years from Advanced Circuits in Colorado, but It's been a...

I'm looking for a new source from which to purchase prototype PCBs. I've been buying for years from Advanced Circuits in Colorado, but It's been a long time since I've shopped around and I'm hoping to find something better/cheaper/faster. My "usual" boards are nothing special - 2 - 4 layers, 3" x 4" or so, with nothing particularly exotic about them. I'm located in Northern NJ, just outside...


OT: K-cars of the rich and famous

Started by bitrex in sci.electronics.design2 weeks ago 2 replies

One of the "luxury vehicles" you'll see down at the local welfare office. The 1988-91 Chrysler New Yorker/Chrysler Imperial. ...

One of the "luxury vehicles" you'll see down at the local welfare office. The 1988-91 Chrysler New Yorker/Chrysler Imperial. psst...it's a Dodge Aries...but people didn't seem to care. It's kinda nice I'd like to get my hands on one, too. it's not electric but that's okay. The mitsubishi 6 is


OT: BT Tower Windows error message

Started by Winfield Hill in sci.electronics.design2 weeks ago 6 replies

London's famed BT Tower displays a Windows error message. Originally known as the Post Office Tower, one of London's tallest landmarks,...

London's famed BT Tower displays a Windows error message. Originally known as the Post Office Tower, one of London's tallest landmarks, it's famed for both its revolving top floor and, more recently, for the banks of LEDs at its summit that act as a very prominent billboard. https://news.sky.com/story/bt-tower-displays-dreaded-windows-error-message-11687381 -- Thanks, - ...


Simple MPPT question.

Started by Yzordderrex in sci.electronics.design2 weeks ago 21 replies

I enjoyed the conversation last week on MPPT chargers. It was well discussed If I am looking for MPPT point can I just use current into...

I enjoyed the conversation last week on MPPT chargers. It was well discussed If I am looking for MPPT point can I just use current into batteries? Dither the pwm around some and find the point of maximum current into the battery pack? I run a 2kW panel now and putting another 2kW up in May. regards, Bob N9NEO


OT: new book on the results of lots of whole genome testing

Started by Anonymous in sci.electronics.design2 weeks ago 23 replies

I've just bought and read https://en.wikipedia.org/wiki/Who_We_Are_and_How_We_Got_Here Unlike Robert Plomin, the author is exquisitely...

I've just bought and read https://en.wikipedia.org/wiki/Who_We_Are_and_How_We_Got_Here Unlike Robert Plomin, the author is exquisitely sensitive to the idea that his work could encourage racists, and points out that his work makes nonsense of the ideas of card-carrying racists because the ancestries that his techniques can work out from current and ancient genomes illustrate that we


USB Charger Port Design

Started by Richard in sci.electronics.design2 weeks ago 3 replies

I need to add a dedicated USB charger port to a product (no data). After looking into USB charging standards I realize what a mess awaits...

I need to add a dedicated USB charger port to a product (no data). After looking into USB charging standards I realize what a mess awaits me. There are dedicated USB charger controllers out there like TIs TPS2511. Has anyone experience with this? I am doubting that I can create a charger that is all things to all devices. For example Apple will charge at 2.4A with certain voltages on th...


Tropical cyclones are less tropical than they used to be.

Started by Anonymous in sci.electronics.design2 weeks ago 12 replies

Interesting article in the current issue of the Proceedings of the National Academy of...

Interesting article in the current issue of the Proceedings of the National Academy of Science http://www.pnas.org/content/115/45/11543?etoc= "Poleward migration of the destructive effects of tropical cyclones during the 20th century". Something for John Larkin to be sceptical about. -- Bill Sloman, Sydney


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