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Comment: Re:Interesting... (Score 1) 115

by The Lerneaen Hydra (#31514058) Attached to: Firmware Hack Allows Video Analysis On a Canon Camera
Well, for what it's worth, the only thing the camera in the video seems to be doing is threshold compare on a pixel by pixel basis, ie if each pixel changes from the previous frame by more than a certain amount then it's highlighted, which is a pretty simple operation. Still, it's a cool proof of concept.

Comment: LTspice & TINA-spice (Score 2, Informative) 211

by The Lerneaen Hydra (#28912799) Attached to: Cheap, Cross-Platform Electronic Circuit Simulation Software?
I've actually been in the same situation myself, two free (as in beer) SPICE derivatives I've found to work well are LTspice and TINA-spice (from linear and Texas Instruments respectively). They are windows binaries but function very well in WINE (in fact the developer(s) for LTspice have designed it to function as well as possible with WINE).

I've mostly used LTspice and it works very well and has a low learning threshold. Of course you can insert spice directives in the schematic to do more advanced functions like basic parameter sweeps as well as monte-carlo simulations and so on and so forth. Check out LTspice's yahoo group for a bunch of documentation.

As far as other recommendations for eagle go I doubt that's what you're looking for as eagle is solely for schematic capture and pcb design, there are no simulation capabilities in it.

Comment: Unlikely numbers (Score 2, Interesting) 516

by The Lerneaen Hydra (#26411145) Attached to: The Environmental Impact of Google Searches

I don't buy these numbers. Assuming the summary is correct and one search uses as much energy as boiling half a cup of water, then the total energy dissipated is;

W=delta_T*specific_energy*mass
Which for water gives (assuming 80 degrees of temperature difference and 75g of water, or about half a small cup of tea);
80*4.18*75=25kJ

A few google searches I just did took on average 0.2 seconds each, as reported by google.
This would give a power draw of 125kW, for just running the services that handled my single request!

Now, I must say that I don't now a lot pertaining to how much power google's servers draw, and of course running the search engine servers ism't enough, google needs to update it's database and do lots of other maintanence. All in all this strikes me as far too much.

Does anyone happen to have any real knowledge about this?

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