Connecting three single phase transformers to get single 3 phase transformer

Started by Anonymous in sci.electronics.design2 hours ago

Could some guru on this newsgroup please help ? I am trying to create a simple 3 phase transformer from 3 single phase transformers. I am unsure...

Could some guru on this newsgroup please help ? I am trying to create a simple 3 phase transformer from 3 single phase transformers. I am unsure about the inter-connection of these three transformers. Consider the 'delta' configuration: Each single phase transformer has 2 terminals on the primary side, and three on the secondary. So for the primary side, the three windings are connect...


Powering Cambridge 210w 8ohm Sub woofers

Started by Anonymous in sci.electronics.design2 hours ago

Hello People, On this website you can see a picture of a three voice coil sub...

Hello People, On this website you can see a picture of a three voice coil sub woofer: http://www.ecoustics.com/electronics/forum/home-audio/646685.html Also known as Cambridge 210w 8ohm Sub woofers (taken from creative gigaworks s750 7.1's). Apperently this is a subwoofer which requires 3 amps of each 70 watts of power to bring this beast alive ! I have mine still stuck in my


Mirror Assembly? Phil Hobbs?

Started by Jim Thompson in sci.electronics.design3 hours ago 20 replies

I have a ViewSonic projector PJ256D that I want to use to project DOWNWARD onto a flat stone surface (to copy an image). Clearly the poor...

I have a ViewSonic projector PJ256D that I want to use to project DOWNWARD onto a flat stone surface (to copy an image). Clearly the poor venting would indicate quick melting of the case :-( So I need a mirror assembly of some sort so that the projector can stay horizontal. Suggestions? (No problem reversing the image... it's an image file.) ...


Cell phone electrocution

Started by Anonymous in sci.electronics.basics5 hours ago 34 replies

Apparently she reached for her phone while she was in the bath, and it was charging... but still......

Apparently she reached for her phone while she was in the bath, and it was charging... but still... ?! http://www.foxnews.com/tech/2017/07/11/teen-dies-from-using-cellphone-while-taking-bath.html


Tesla Battery Fantasy Time...

Started by Jim Thompson in sci.electronics.design6 hours ago 10 replies

Tesla Battery Fantasy Time... ...Jim Thompson -- | James E.Thompson ...

Tesla Battery Fantasy Time... ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Syst


Tired of feeding all the neighbor cats

Started by amdx in sci.electronics.design7 hours ago 36 replies

I can't feed my cat without finding stray cats coming around eating what she didn't. I have started emptying her bowl if she stops eating, but...

I can't feed my cat without finding stray cats coming around eating what she didn't. I have started emptying her bowl if she stops eating, but that is not the solution. Is there a passive device that I could put on a collar to trigger a receiver that I could attach to a yet to be designed cover for the cat bowl, so the food is only available when the cat is at the bowl. I'd prefer a ...


Ripple harmful in this circuit?

Started by ehsjr in sci.electronics.design7 hours ago 25 replies

I've got a N/O sensor which is designed to last at least 10 years. I want the switching circuit it drives to last at least that long, plus 50%:...

I've got a N/O sensor which is designed to last at least 10 years. I want the switching circuit it drives to last at least that long, plus 50%: 15 years. The sensor and circuit will be replaced every 10 years or when the sensor closes, whichever comes first. The circuit is simple: (schematic below) 24VAC into a 4 diode bridge. NO filter cap. Sensor from + to NPN base through 10K. Base ...


SF Millenium Tower Again

Started by Anonymous in sci.electronics.design7 hours ago 26 replies

Wonder how they plan on leveling the existing fiasco that leans so much the elevators jam? Looks like the original design group didn't get...

Wonder how they plan on leveling the existing fiasco that leans so much the elevators jam? Looks like the original design group didn't get bogged down in too much math. https://www.bizjournals.com/sanfrancisco/news/2017/07/19/fix-may-be-in-the-works-for-millennium- tower.html


OT: Algebra is a civil rights issue

Started by Jim Thompson in sci.electronics.design7 hours ago 99 replies

OT: Algebra is a civil rights issue... ...Jim Thompson -- | James E.Thompson ...

OT: Algebra is a civil rights issue... ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal


LT spice, leakage inductance

Started by John Larkin in sci.electronics.design7 hours ago 186 replies

I'm simulating a flyback switcher and noticed that any K < 1 in the transformer radically slows down the sim, which is annoyingly...

I'm simulating a flyback switcher and noticed that any K < 1 in the transformer radically slows down the sim, which is annoyingly slow already... 90 seconds to sim 60 ms of startup and a little pulsed load blip. Maybe 6:1 slower with a little leakage inductance. So I only include leakage inductance to tweak the snubber. -- John Larkin Highland Technology, Inc picosecond


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