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That's it. End of step. |
Step 5: Assembly. |
Lay the balloon over the top of the cannister and put the lid on so that it is pulled fairly tight. If you have a hole in the lid, you will be able to check that the balloon is smooth and tight. |
Slide your straw into the bottom of the cannister until it presses against the diaphragm. Again, if you have a hole in the lid, you will be able to see where the end of the straw ends up. |
That's it. The air-horn is made. |
Go on, try it. Pucker up to the hole in the side and give it a blow. |
Step 6: It Doesn't Work? |
If you're lucky, the horn will sound first time. Well done. |
If all you get is a feeble hiss, keep blowing and gently nudge the straw harder against the balloon by tapping against the end of the straw. |
On the other hand, if you just get silence and bulging cheeks you need to pull the straw out very slightly. |
Step 7: Hacking the Make. |
I know you. If you're reading this, you probably won't stick to the basic instructions. You're probably already wondering if that plastic pot you keep your nails in would do the job, and you're fairly sure you've got an old rubber glove somewhere... |
Yes, they probably will work. Film cannisters and balloons were just the easiest materials I had to hand, but I've also made one with a plastic snack pot and using the palm of a disposable rubber glove for the diaphragm. |
Could you make one from a bucket? A dustbin? |
What about the air supply? Blow too hard, for too long, you'll start seeing stars and have to have a nice sit down. |
I made a basic model with a small inlet-hole, so it was a snug fit for the needle adaptor of a bicycle pump. That worked, honking nicely for every push of the pump. A larger stirrup-style pump I borrowed had a small air-reservoir, and with practice that gave a steady drone. |
Tuning? What about tuning? |
I haven't looked into this properly yet, but the note seems to be linked to the length of the tube you use, the tube's diameter and the tightness of the diaphragm. |
Can you make it play a proper note? Could you make it tuneable? |
Go on, enjoy yourself and don't annoy the neighbours too much ... |
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80 Discussions |
10 years ago on Introduction |
Hmm, if i was gonna make about 20 of these for a birthday party, i'd want it to be less breakable, what if I hot glued the straw into place where it goes through the hole at the bottom of the canister and cut the straw bit that is sticking out off at about 6 cm (about 2")? |
2 replies |
Reply 10 years ago on Introduction |
That would work, but you'd have to be very sure the straw was in the right place before you glued it. If you could manage it, you could replace the straw with a stiffer tube, say a section of pen barrel, then it is less likely to wobble away from the perfect position. Trimming it short is not a problem - I have mad... |
Reply 10 years ago on Introduction |
Thx! Haha, my little bro's gonna love these, though i'm not when he keeps using it every 5 seconds... |
12 years ago |
OOOHH had an idea for modification!...a WHOLE bunch of these things of various sizes hooked to an air compressor with either foot pedals or solenoids or something that you could use to "blow" each horn indipendantly or at the same time etc... NEW musical instrument...we could go on tour! |
7 replies |
Reply 11 years ago on Introduction |
They don't hurt, but they make a room stop and look. We did this with 25 Cubs - the noise was bad, and annoying, but our ears didn't ring afterwards. |
11 years ago on Introduction |
Amazing... it's been a while since I've read an Instructable and immediately gone to make it. Took about ten minutes from scrounging parts to it working! Possible discovery for people wanting to tune them- my straw is a slightly loose fit so needs holding against the diaphragm to sound properly, and the note can be... |
1 reply |
Reply 11 years ago on Introduction |
Glad you appreciated it! The alarm-clock idea, though ... I can't say I fancy being woken by one of these...! |
Reply 4 years ago on Introduction |
How did I steal it when I published two YEARS before he did? |
I know the camera angles look the same, and so does the layout of each shot, but that's not because I stole the idea off Kipkay, it's because Kipkay stole the idea off me (he's known for stealing ideas and not giving credit, check him out). |
Reply 7 years ago on Introduction |
No, this is my air-horn. |
I avoid Kipkay's projects, as I prefer to read original work. |
Reply 7 years ago on Introduction |
Check the dates. |
I published this two years before Kipkay posted "his" horn. |
Who do you think copied who? |
Igfig: Last time on Eberron! Igfig: You had hatched a plan to catch Jaela Daran, the Keeper of the Flame, in public so you could inform her of the Lord of Blades' imminent attack Igfig: by means of bird wildshapes Igfig: which was fairly successful Igfig: but unbeknownst to you, Frosty had taken the airship on his own ... |
At Thirty Seconds to Mars' Dec. 6 show in Sacramento, California, frontman Jared Leto stopped the show mid-song to call out security guards whom he felt were being too aggressive with one fan. |
"Security, settle down, security! Turn the lights up, turn the lights up. You do not need to take that guy down. You guys are being too aggressive tonight," Leto says in the video below, acquired by TMZ (seen below). "Guys, turn the lights up, turn the lights up, turn the lights up, turn the lights up I said," he deman... |
"Do not abuse this guy, okay? Relax, settle down, don't escalate the situation. That's fine but there's seven guys like on top of this guy. It's ridiculous," he continued, pausing for a moment before adding, "I know it's a funny thing - it happens when you get too many security guards in one building, there's always pr... |
The band has wrapped up their touring for 2018 and will head to Europe next summer as they continue to support their new album, America. Shortly after the album's release in April, guitarist Tomo Miličević, who had been with them since 2003, announced his departure. |
Top 100 Hard Rock + Metal Albums of the 21st Century |
2-December, 2015 |
As Featured in Moab Happenings, December, 2015 |
Photographing the Red Rocks Country |
Chasing the Magic Light: Why Some |
Photos Look Best when the Sun is Low |
By David L. Brown |
Landscape photographers tend to be up early and stay out late. They consider the middle of the day as a time to scout for scenes or catch a nap. That’s because the warm rays of the early morning or late afternoon sun bring scenes to life in a way that noontime light can never match. |
That’s especially true here in the red rocks country because the tones of russet, bronze and rust come to life when the sun illuminates them with warm light. That is why landscape photographers do some of their best work during the “magic hour” or “golden hour” times when the sunlight is filtered through the atmosphere... |
During the middle of the day, when the sun is high in the sky, the light is blue, giving everything a less exciting look. Sure, you can use a warming filter or add color saturation in Photoshop, but the result is not the same. In part this is because the midday light is also “flat,” due to the angle of the sun. |
Here are two examples to illustrate this point. The two pictures in Fig. 1 and Fig. 2 were taken in September near Horsehoof Campground during an overnight trip into the heart of the Needles District of Canyonlands National Park. |
Fig. 1 was taken in the middle of the day, and the result is merely a record of the spires and “needles” for which the area is named. Incidentally, this picture was made with a warming polarizing filter that partially offset the blue cast of the light. There is nothing wrong with this picture, and any photographer coul... |
But look what happened when I returned to the same spot later, as the sun was just beginning to set in the west (Fig. 2). The scene comes to life with glowing color. Plus, the light is angled from the side to create patterns of highlights and shadows that bring out details in the rock formations. |
This is the secret of photographing during the “magic hours” of early and late in the day, and it’s clear to see why serious landscape photographers are early risers and often stay out in the field until the last rays of sunset fade from the sky. |
Fig. 3 offers another example of the power of the golden light to bring the red rocks country to stunning life. This image was also made near Horsehoof Campground, and illustrates the vivid colors that are brought out by the beams of the setting sun. |
Incidentally, little if any color warmth was added to these examples in Photoshop. For an example of what can be done in post processing, see Fig. 4. This picture was made during the same trip among the Needles, and was shot not only during mid-day, but in the shade of an overhanging ledge. The original was flat and ha... |
Fig. 1 – This picture was made during mid-afternoon with the sun high in the sky. The scene is in the Needles District of Canyonlands National Park, taken at Horsehoof Campground in late September. The photo is “flat” and has muted colors due to the high angle of the sun and the blue cast of the light. |
Fig. 2 – The same scene as in Fig. 1, but made as the last rays of daylight illuminate the red rock fantasyland. The warm colors and dramatic side lighting make a far more pleasing photo than in the first example. |
Fig. 3 Another picture made as the sun was low in the sky. Again, the vivid colors and detail makes the red rocks seem to glow. |
Fig. 4 In this example post-processing in Photoshop was used to bring out the colors of these Anasazi hand- and footprints. In this case the original was flat and had a blue cast due to the time of day and the shade of an overhanging ledge. |
Adaptive RTS/CTS-Exchange and Rate Prediction in IEEE 802.11 WLANs |
Wonbae PARK Taejoon KIM |
IEICE TRANSACTIONS on Communications Vol.E101-B No.6 pp.1485-1493 |
Publication Date: 2018/06/01 |
Online ISSN: 1745-1345 |
DOI: 10.1587/transcom.2017EBP3269 |
Type of Manuscript: PAPER |
Category: Terrestrial Wireless Communication/Broadcasting Technologies |
rate adaptation, coherence time, RTS/CTS frame, IEEE 802.11 WLANs, |
Full Text: PDF(780.6KB) |
>>Buy this Article |
Regarding IEEE 802.11 wireless local area networks (WLANs), many researchers are focusing on signal-to-noise ratio (SNR)-based rate adaptation schemes, because these schemes have the advantage of accurately selecting transmission rates that suit the channel. However, even SNR-based rate adaptation schemes work poorly i... |
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Security Monitoring Equipment Failure Solution Mar 12, 2018 |
After a security monitoring system enters the commissioning phase, commissioning phase, and after delivery, there may be such a failure phenomenon of the security monitoring equipment, such as: the technical indicators that do not work properly, the system cannot meet the design requirements, and the overall performanc... |
One, the power is not correct |
Incorrect power supply may be as follows: The power supply line or power supply voltage is incorrect, the power is not enough (or the line diameter of a certain power supply line is not enough, the voltage drop is too large, etc.), the transmission line of the power supply system is short-circuited, open circuited, ins... |
Second, the wiring is not good |
Because there are many links between certain devices (such as cameras with three variable lenses and PTZ), if the handling is not good, especially if the lines connected to the devices are not handled well, there will be open circuit, short circuit, and line insulation. Poor, miswiring, etc. lead to equipment damage, p... |
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