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DC motor reversing

Started by Archer in sci.electronics.basics3 months ago 2 replies

Hi there I am no electronics geek And I am wondering whether it is possible to get a C motor circuit without relays (may be using...

Hi there I am no electronics geek And I am wondering whether it is possible to get a C motor circuit without relays (may be using transistors) Innocent


Electronic design

Started by Phil Hobbs in sci.electronics.design5 months ago 16 replies

JL wrote an interesting post in the depths of the "better microelectronics from coal" thread that I thought was worth pulling out on its...

JL wrote an interesting post in the depths of the "better microelectronics from coal" thread that I thought was worth pulling out on its own. On 2024-01-21 10:12, John Larkin wrote:> "...what IS electronic > design, and what's the best way to do it? > > Short answer, cobbling. When presented with a problem or an > opportunity to design electronics, the most efficient way t


hidden device finder

Started by RichD in sci.electronics.design5 months ago 2 replies

Would you trust this...

Would you trust this gadget? https://omg-solutions.com/multifunctional-detector-rf-signal-mobile-phone-camera-lens-magnet-det ector-1-8000mhz-spy991/ I expect it would constantly beep false alarms. -- Rich


Progess on marking spam.

Started by Anthony William Sloman in sci.electronics.design5 months ago 14 replies

I've got back to the 9th November 2023 marking all the spam advertising regulated goods and service. Google will probably get around to deleting...

I've got back to the 9th November 2023 marking all the spam advertising regulated goods and service. Google will probably get around to deleting all of it. The flood seems to have started on the 24th October 2023, so I've still got a way to go, but the end is in sight. Darius the particularly Dumb is a different kind of problem. John Larkin has been just as reliably wrong for a lot longer...


Win 11 notifications

Started by john larkin in sci.electronics.design5 months ago 1 reply

Now and then, Windows 11 pops up a notification telling me that I have no new notifications, and that I have disabled notifications.

Now and then, Windows 11 pops up a notification telling me that I have no new notifications, and that I have disabled notifications.


the enigmatic zipper

Started by RichD in sci.electronics.design5 months ago 20 replies

I haven't yet met anyone who can explain the zipper. Equally baffling, is its malfunction. You know, suddenly the teeth won't mesh. You try...

I haven't yet met anyone who can explain the zipper. Equally baffling, is its malfunction. You know, suddenly the teeth won't mesh. You try to force the tracks together by hand, but nada, it's irreparable. How can a mechanism so simple fail? So simple, yet so inexplicable... Who invented this gadget? He deserves a monument - --- Rich


500 volt power supply

Started by John Larkin in sci.electronics.design5 months ago 109 replies

This is pleasingly weird. https://www.dropbox.com/sh/sif3efs69dxe1mg/AACY0RJGXl4k8CVvauUbJtYFa?dl=0 Sort of a baseline-boosted...

This is pleasingly weird. https://www.dropbox.com/sh/sif3efs69dxe1mg/AACY0RJGXl4k8CVvauUbJtYFa?dl=0 Sort of a baseline-boosted multi-auto-transformer voltage-doubler flyback. What's strange is that adding the two snubbers increases the LT spice sim speed radically, about 10:1.


speed test

Started by John Larkin in sci.electronics.design5 months ago 70 replies

I signed up with Comcast for, I think, 30 megabit cable internet. I had a service problem a while back so they upgraded "for free" to 50. I just...

I signed up with Comcast for, I think, 30 megabit cable internet. I had a service problem a while back so they upgraded "for free" to 50. I just ran a speed test and it's 920+38 Mbits. This is with a CAT5 cable right from their modem. At work, we have a MonkeyBrains dish. We pay for 50+50 and get 500+500. This seems to be a trend, much faster internet than we signed up for, same price. ...


frozen Teslas

Started by John Larkin in sci.electronics.design5 months ago 83 replies

https://www.fox32chicago.com/news/dead-teslas-oak-brook It's probably not a good idea to buy a Tesla in a place that gets below 0F. Some...

https://www.fox32chicago.com/news/dead-teslas-oak-brook It's probably not a good idea to buy a Tesla in a place that gets below 0F. Some day a Tesla will freeze up and kill some people, with legal consequences.


Digikey data sheets

Started by john larkin in sci.electronics.design5 months ago 20 replies

It feels like the Digikey data sheets are now often links off-site, and those links are now often broken or plain wrong or...

It feels like the Digikey data sheets are now often links off-site, and those links are now often broken or plain wrong or otherwise useless. Plus, most of the parts are unavailable or insanely priced. They show several relays over $50,000 each but they are fortunately unavailable.


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