Juergen Knoop said:
Yes.
In the USA all mains power that is coming out of the wall is derived from a step down transformer that has single phase HV, and it produces 120-0-120 that is sent to the main breaker panel that way. Then the breaker panel's breakers alternately down a column are on one phase, then the next on the other phase, and so on...
So unless you wired your home yourself, or gave specific instructions when it was built, the phase coming out of any given wall outlet could be in phase with another or out of phase.
In the case I mentioned, one side would be 180deg out from the other side.
_-_-bear
1audio said:
Yes, but how often they are used in IC design instead of computer modeling? This is my question.
Steve Dunlap said:
We spoke about GFI here, but there is also a safety breaker principle based on voltage difference, rather than leakage current.
Steve Dunlap said:
Yes, the patents I found had to do with outdoor neon signage. GFCI saved me at least once. I had an old Milwaukee saw (solid stainless) that was not double insulated and cut right through the power cord.
scott wurcer said:
That sounds like the right Tom Hopkins. I think everyone that worked in the engineering department owes their life to Tom at least once. In my case, I encountered the output of a 1500V 60mA transformer. His GFI circuit shut it off so fast I hardly even felt it. There is no telling how many salesmen and installers he saved with that.
1500V
I once got a shock from a similar transformer (of a home brew oscilloscope) without GFI. Needless to say that it was a far from pleasant experience.
I once got a shock from a similar transformer (of a home brew oscilloscope) without GFI. Needless to say that it was a far from pleasant experience.
janneman said:
Strongly disagree. In hardware design there are more of limitations than in software design. And hardware design skills help to design software.
thanks, I just want to be sure that the transformers outputs are groundreferenced by earthing the center tap and not left floating. 😉bear said:
Our homes here are usually supplied with 230/400V three phase (120° phase angle) from distributed transformer stations.
See pictures of historic ones:
http://www.pigasus.de/lost/html/trafo.html
regards
Wavebourn said:
Disagree. For software design you need to be able to think on a (much) higher level of abstraction. Being used to actual stuff you can touch and turn around doesn't help at all.
I'm currently working on a data logger PC app talking to a microcontroller. The PC software is in VB 2008 .NET . Let me tell you, it is VERY abstract. You know, your Delegate has to Interface to the main thread via a Contract. Huh? Yes.
From my own experience, playing as a kid with mechanical and physical stuff helps you to develop cause-and-effect thinking and 3D visualisation.
YMMV
Jan Didden
janneman said:
A bit more OT/
By the way Jan, the math behind riding a bicycle is quite complex. Ever tried to ride a bike along a straight line? Theoretically and practically impossible.
Regards,
Edmond.
Edmond Stuart said:
Indeed. You can't ride a bike without negative feedback either. This is one real case where open loop operation will crash you big time 😀
Jan Didden
With the right person holding the handlebars, it's no problem to ride a straight line.
It is as mentioned above, a matter of feedback
Magura 🙂
It is as mentioned above, a matter of feedback
Magura 🙂
Really OT/
There are two feedback loops: one from the driver and one from the Coriolis effect of the front wheel.
There are two feedback loops: one from the driver and one from the Coriolis effect of the front wheel.
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