>>958374 I've made a hand-cut dovetail box of decent fit and finish on my first try. So while I have some degree of patience and decent ability to read instructions a bow may be one of those things where it's too reliant on past experience and 'feel' to make it worthwhile if you aren't going to make this a passion of some sort.
So yes, if someone could confirm this, I'll just drop the thought and start saving my pennies instead.
worrying about something not being really, really high quality the first time you try it, isn't going to get you anywhere
if you want to do it for the fun and skills in making one, then do it....if you're expecting to go running through the woods to hunt other humans, I'd suggest getting one from people who have experience making them
Hey /diy/. I have always been a toe-walker, and for anyone who doesn't know, this can actually cause some pretty serious structural problems in your body if it goes on too long. Although I am not even out of collage yet, I am already noticing some minor issues. I am physically able to walk flat footed, but unless I am continuously thinking about it I automatically revert to walking on my toes. So I had this idea that I could build a device that will detect when I start toe walking and alert me. What I have developed is arduino based. There are three inputs. a button on... Comment too long. Click here to view the full text.
>>962807 I wasn't in the old thread but imho the fans look a little silly, mind telling me why someone would actually require such a device? I think it would be of use if you could measure the entire body temperature and it automatically adjusts the temperature for the hands, for example if you get cold hands because you are anxious of an exam or something like that it would warm them up?!
>>964828 Eastern bloc electronics.inc trying to steal muh 'murrican patents again? Use an LM328 minimum voltage is 3V so use w 2, 1.5V cells Those things run with 2 in series just so you know. Alternatively you could build one off a decently biased transistor And add an in ear headphone to the output and a mic to the input.
I have a chance to buy a Tektronix 502A oscilloscope from the 60s (seller doesnt know if it works or not) ,I like it partly cause I like old vacuum tube devices, already restored a tube radio and couple of tv-s.
there are surely some scope guys here
Now is the Tektronix 502A any good, I would be using it mainly on vaccum tube stuff and maybe some signal generators and a bit of the modern stuff ,Would it be good for TUBE amplifiers ??
I cant find decent information on it, like watis maximum input voltage and such
So I live in U.S. Growing Zone 5, and have an old wrought iron "decorative" fence with spacing about a spread hands wide. My dogs are not fans of the neighbors and I'm trying to find a kind of ivy that will grow up and cover the fencing, thickly like the picture, at least for spring - fall (kids are not out in the winter as much). I've checked several gardening stores nearby but get the stereotypical 17 year old "Um......" every time. Had a problem when I bought the place a few years ago with ivy growing out into the yard, so if one is available,... Comment too long. Click here to view the full text.
So I'm going to build a solar oven as part of a project for this Summer. I'd love to know if any of you have any experience building them?
Unfortunately I have an additional caveat in its design which is that it must be transportable and not to heavy (as I need to fly with it)
- Get a large (golf?) umbrella. Remove the handle section, leaving just the ribbed mechanism for opening the umbrella.
- Using the geometry of the umbrella as a template, I can cut out 'petals' of reflective material, which I can then attach between each rib.
- Was thinking of using silver mylar on the roll (20m x 1.2m wide for £25 on the bay: http://www.ebay.co.uk/itm/Silver-Mylar-Reflective-Mirror-Foil-Sheet-Sheeting-20M-Roll-Party-Gift-Wrap-/131701785611?hash=item1eaa09c40b:g:oWcAAOSwFqJWl83w) Either attach the mylar by adhesive (when on site), or if I can I can bolt it on with small wingnuts which'd allow me to deconstruct it without tearing it apart.
I guess my questions come down to:
- Does the above make sense and do you think it'll work?
- Is Mylar sheeting gonna be good enough? Can anyone suggest a better alternative for this application?
- Is the geometry of an umbrella going to be appropriate to focus the solar energy to the centre point?
I'm going to be using it in desert conditions, average highs of 28-34C, and I intend to use it to make bread. I'm optimistic about reaching 180C, not sure if I can push 230C
I own an IR thermometer and will probably test it here at home (mild summer temps) to see how it might fare.
>>963257 I've made several styles (Fresnel lens, Funnel, Panel, Parabolic, Box, Collapsible, Mylar blanket, etc.) My personal favorite has been a standard insulated box cooker with 4 trapezoid-shaped reflectors. However, the one I use for cooking bread loafs and big meals is rather large, heavy, and required attaching wheels to move it around.
Parabolic cookers are very fussy. You have to get the cooking vessel right in the focal point at all times. This requires lots of babysitting. You will need to adjust the alignment... Comment too long. Click here to view the full text.
so I am trying to set up a business selling grainspawn bags. I can do small runs of like two bags at a time in my cheap 9L pressure cooker. each batch takes about 3 hours of work. now to move up in production capacity, I need a larger pressure vessel. the all american pressure cookers cost about 1000$ to get shipped to australia. and they're about 40quarts at the biggest. so I could run like 5 of them at a time but that's a really expensive way to do it. is there a way that I could make a pressure vessel of my own that could stand up to at least 15psi repeatedly and... Comment too long. Click here to view the full text.
/diy/, how is ac mains polarized??? i mean, i just don't get the concept... the polarity changes like 60 times in a second, what's the point of having a hot and a neutral wire, and how are polarized sockets (like bulb sockets) any safer than anything else? i don't
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