Compact portable power?
11 more posts in this thread. [Missing image file: hydropak09.jpg]
I own loads of devices for this, it's an obsession of mine. Solar panels, batteries, fuel cells, even a small fold away stove that uses thermal energy to make electric power. But they all output either 5v via USB, or 12v via an automotive style 12v socket.
The only reasonably portable power source I have ever found that will fit in a backpack, not weigh too much, and is powerful enough to run an inverter for stuff that needs 120v is just an encyclopedia sized lithium battery with 12v adapter. (Hyperjuice, for laptops)
Is this really as good as it gets? I've been looking into alternatives and it seems like the closest alternative are direct methanol fuel cells. They run on a stable, cheap liquid fuel you can refill yourself (instead of having to buy proprietary fuel cartridges, like with sodium silicide).
My ultimate fantasy is legal, compact RTGs for civilian use. Something about the size and weight of a 2 litre bottle of soda that can provide enough power for high drain applications like running a camping stove, heating water, running a fridge, etc.
Until then, what are some options I'm overlooking? Devices that can source freely available fuel (like the biolite stove/charger) are preferred. Must be something I can actually buy today.
Thermometer and humidity measuring device?
4 more posts in this thread. [Missing image file: ludwig_bosendorfer1.jpg]
I have this old piano, similar to the one in the picture, and I would like to automatically control temperature and humidity in the room in order to keep the instrument in good condition (and in tune), since it's even more sensitive than a normal, modern piano.
I don't know what thermometer and humidity measuring device that is good for what I need. Even better would be if any of you know how to set it up so that it just keeps my room in a certain temperature and humidity range. Any ideas?
Btw. this is in Central Europe, and I live on the 7th (top) floor. The room itself has a water-gas heater, but I also have the electric one.
3 more posts in this thread. [Missing image file: 180px-MW_RingOfPhynaster.jpg]
/diy/, I think I need your help.
I don't know exactly what's come over me, but I've found myself suddenly wanting to be a jewelery maker. Specifically, a maker of rings. I'm not even sure if this is the right place to post this, but I don't really know who else to approach with this.
I dropped out of Uni about two semesters ago and I'm pretty much a bum at this point. On the plus side, I have more time than I know what to do with. But I wouldn't even know where to begin with something like this. Can anyone shed some wisdom on the subject? I know absolutely nothing about the jewelery business, and frankly this sudden interest is unexplainable to me. I've never found any type of metal crafts to be interesting at all...But now, I want to do it more than anything.
What kind of information do I need? Where do I go to learn the craft? Who should I talk to? How do I get started? Any help you can offer would be greatly appreciated.