OT: Quantum entanglement for secure transmissions across existing fibreotic links

Started by Anonymous in sci.electronics.design2 weeks ago

Last weeks Proceedings of the (US) National Academy of Science included an interesting...

Last weeks Proceedings of the (US) National Academy of Science included an interesting paper. https://www.pnas.org/content/pnas/early/2019/03/13/1818752116.full.pdf I imagine that it will eventually turn into a commercial service. -- Bill Sloman, Sydney


LED drivers, >24V, 20-30A current reg, fast PWM

Started by Winfield Hill in sci.electronics.design2 weeks ago 7 replies

What are some good switching-mode LED drivers, able to work > 26V, regulate current at 30A (ext FETs), and do fast PWM for 3000:1 or...

What are some good switching-mode LED drivers, able to work > 26V, regulate current at 30A (ext FETs), and do fast PWM for 3000:1 or better dimming? We looked at MAX16819, what are some others you like? -- Thanks, - Win


Since we are discussing microphones please look at my choice for hearing aid and comment.

Started by Yzordderrex in sci.electronics.design2 weeks ago 16 replies

I have secured some financing to proceed with low cost hearing aid. I hope to get these into hands of those that the VA cannot help. This is a...

I have secured some financing to proceed with low cost hearing aid. I hope to get these into hands of those that the VA cannot help. This is a wake on sound demo board. Battery drain should be minimum. It has some on board amplifier which I expect will help with keeping noise under control while providing a nice signal. It will turn on following amplifier on wake-up. Frequency r


Obscure vacuum tube question

Started by bitrex in sci.electronics.design2 weeks ago 9 replies

6 volt filament, 9 pin miniature tubes that have a pentode and single diode in the same envelope, that have a modest heater current...

6 volt filament, 9 pin miniature tubes that have a pentode and single diode in the same envelope, that have a modest heater current requirement (500mA or less.) With a separate cathode and anode for the diode, not sharing the other tube's cathode as many did. Obscure, I know. :) I looked through my GE "Essential Characteristics" book and only found two. 6HJ8. 6AS8. Huh. I thought the...


CAD: Altium Designer 18, please vote

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

Sorry, s.e.d denizens, but the .CAD group is dead. Altium users, please vote, severe AD 18 troubles, among the worst, various Properties...

Sorry, s.e.d denizens, but the .CAD group is dead. Altium users, please vote, severe AD 18 troubles, among the worst, various Properties Panel issues. https://bugcrunch.live.altium.com/#Bug/10313 Has 116 votes, needs more to get Altium to fix it. -- Thanks, - Win


Digi-key sales support

Started by Bob Engelhardt in sci.electronics.design2 weeks ago 22 replies

I placed an on-line order earlier today & just now realized a mistake. I called their 800 number and got an American, on Sunday! He canceled...

I placed an on-line order earlier today & just now realized a mistake. I called their 800 number and got an American, on Sunday! He canceled the order & saved me the annoyance of placing a 2nd order for the one incorrect part. He was very helpful and pleasant as well. Big thumbs-up!


Way OT. HPMOR

Started by George Herold in sci.electronics.design2 weeks ago 1 reply

So for any similar fans of Harry Potter and rationality/ science. I offer this as a fun read. http://www.hpmor.com/ I'm only up to chapter...

So for any similar fans of Harry Potter and rationality/ science. I offer this as a fun read. http://www.hpmor.com/ I'm only up to chapter 10, but so far it's a hoot... It doesn't really get good till chapters 5 or 6. If you haven't read any HP then don't bother. George H.


Grid quality meter, included in product

Started by Anonymous in sci.electronics.design2 weeks ago 17 replies

Hi I need q grid quality meter, I could produce in the hundreds to be included in a product Example of a finished circuit, with schematics...

Hi I need q grid quality meter, I could produce in the hundreds to be included in a product Example of a finished circuit, with schematics and code: http://www.ti.com/lit/df/tidrzb8/tidrzb8.pdf http://www.ti.com/lit/ug/tiduem8/tiduem8.pdf Anyone got an alternative? Cheers Klaus


OT: $222,000,000,000,000, if you please!

Started by Cursitor Doom in sci.electronics.design2 weeks ago 21 replies

Thanks to the ideas of people like Bill Sloman, every man, woman and child in the US is saddled with $677,000 of debt....

Thanks to the ideas of people like Bill Sloman, every man, woman and child in the US is saddled with $677,000 of debt. https://tinyurl.com/y3z6yfcq Communist revolution via public spending: https://en.wikipedia.org/wiki/Cloward-Piven_strategy -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through o...


SSD relay - or how to charge 2 batteries at one time

Started by Sonnich Jensen in sci.electronics.design2 weeks ago 23 replies

Hi all I have a camper van, at it has to batteries - one for the car itself, and one for axial stuff, such as light, fridge etc for the living...

Hi all I have a camper van, at it has to batteries - one for the car itself, and one for axial stuff, such as light, fridge etc for the living area. By design there is a relay that kicks in when there are enough RPMs to also charge the axial battery. To put it simple - when starting the car, the cars battery get charged immediately, the axial battery only when I start moving. It simple put...


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