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January 7, 2007
News - Digikey Sort By Price
about 11 years ago
WOW, thanks! especially to the built-in column sort, neat trick! can't believe I didn't figure that out earlier! I've got it bookmarked!
Digikey should really thank us. The one biggest reason why I haven't been buying from digikey is the lack of the price sort--turns out, for us hobbyists, single-unit pricing is important. I've always liked DigiKey a bit better than mouser--they tend to have things stocked more often (last few projects, items from mouser went OOS right before I ordered, requiring me to find replacement parts. . .happens a lot more often than i'd like). Plus, their sort is honestly much better for part parameters--a lot of parts on mouser are not categorized properly. And, they have a much wider selection. Looks like it's time to switch over to digikey!
News - Neat New Products
about 11 years ago
yeah, i've been wondering about that for a while. What's new about this whole new generation of three-axis gyros? Analog Devices has been manufacturing and selling these things (three axis gyros, three axis accelerometers, everything, really) for at least a couple of years by now. It's only that they seem to have gotten popular very recently, and other manufacturers started making them. Is it the price point? New, lower manufacturing cost three-axis gyro? What is it?
News - Behold... ArduPilot Mega …
about 11 years ago
unfortunately, i don't think so =( the underwater military subs use VLF (very low frequency) for more than 30 ft underwater. they get VERY low bandwidth (on the order of hertz). Typically they send over this band when there's something important the sub needs to receive, and then it goes closer to the surface and launches an antenna to receive the full high bandwidth coded message. Unfortunately, transmitting at these low frequencies is not trivial at all (wavelength is ENORMOUS, and most transmitters are very low efficiency)
However, I'd imagine some other mhz-range frequencies might get a couple of feet out of the water. 2.4ghz is very clearly not going to work--think about how your microwave works (water absorbs 2.4ghz and heats up)
News - Battery vs. Water Tank
about 12 years ago
You'll also have problems with heat leaking out. Since the volume-surface area isn't as great with a smaller tank, you'd have to seriously consider insulation for the tanks.
And of course the thermodynamics are nasty, as someone else pointed out. More delta t!
Unless I'm mistaken, the majority of solar farms these days actually use this mirror/water tank setup, not PV panels. In fact, I think PV solar panels areused mostly for smaller setups. The water tank system might actually more (cost?) efficient at larger scales than PV panels.
And traditional solar panels are not going to go down in price--if you look at the trends in industry and cutting edge research, "traditional" (now that I think of it, I think the superheated water technology came before PV panels) silicon PV panels have basically hit a lower bound in terms of production cost. All that's helping right now are some tax rebates here and there, but that doesn't actually make solar cheaper. Most of the new efficient solar technologies are mostly dye-based panels.
No public wish lists :(