Performing music in open spaces can be a real challenge. The acoustics of the space can play spoil-sport. Now imagine trying to play an instrument spread out over tens of kilometres. The folks at [LimbicMedia] wrote in to tell us about the project they worked on to build the The World’s Largest Musical Instrument.
The system consists of wirelessly controlled air horns deployed at remote locations. Each air horn is self contained, driven by a supply of compressed air from a scuba diving tank and battery powered electronics. The wireless link allows the air horns to be placed up to 10kms away from the base station. Each air horn is tuned to a specific note of the piano keyboard which, in turn, is configured to transmit its note data to the air horns.
Currently, they have built 12 air horns, enough to let them play the Canadian and British anthems. The horns are built out of PVC piping and other off-the-shelf plastics with the dimensions of the horn determining its note. The setup was installed and performed at the Music by the Sea festival recently, by mounting the air horns on 12 boats which were stationed out at Sea in the Bamfield Inlet in
Eastern Western Canada. But that was just a small trial. The eventual plan is to set up air horns all around Canada, and possibly other places around the world, and synchronise them to play music simultaneously, to commemorate the 150th Canada Day celebrations in 2017.
There aren’t many details shared about the hardware, but it’s not too difficult to make some guesses. A micro-controller to operate the air solenoid, long range radio link to connect all the air horns to the base station, and another controller to detect the key strokes on the Piano. The limiting issue to consider with this arrangement is the spatial separation between the individual air horns. Sound needs about 2.9 seconds to travel over a kilometer. As long as all the air horns are at approximately the same distance from the audience, this shouldn’t be a problem. See how they did in the video after the break. We do know of another project which handled that problem brilliantly, but we’ll leave the details for a future blog post.
This isn’t the first time [LimbicMedia] was commissioned to create audio-visual public installations. A couple of years back they built this Sound Reactive Christmas Tree in Victoria, British Columbia.
Continue reading “Super Massive Musical Instrument”
[Rick Osgood] has been busy making more scaring gags for Halloween. This week he’s sharing great ideas for an air horn and pneumatic jumping skeleton, both actuated by 24 V sprinkler valves. These two new gags can easily be activated using [Rick’s] cardboard floor plate switch and three 9 V batteries cleverly snapped together in series for a 27 V supply (we can’t resist dropping in this link to a 2196 V supply from 9 V batteries just for fun).
The air horn construction is quite unique using a latex balloon strategically located as a reed valve for the air to vibrate over as it rushes out making a very loud honking sound. [Rick] then connected his manual bicycle pump to an air supply so that when an air valve is actuated the bicycle pump handle with a skeleton wired to it pops up. It then lowers back down via a bleed hole in the air line. Both the air horn and pneumatic pop-up skeleton seem simple to construct and his tests show them functioning perfectly.
Being the air storage chambers are small the re-trigger setup seems too repetitive to be practical for a continuous stream of Trick-Or-Treaters. Perhaps one could hide an air compressor with a long feed line to supply the gags? Plus, using an air compressor would come in handy for other scary blasts of air. Of course you would want to lower the compressor’s output regulator to safe levels so you don’t risk blowing apart your pop-up skeleton rig or any pipes.
Follow along after the break to see how to build these two great gags and get some tips from Mr. Safety.
Continue reading “DIY Pneumatic Skeleton and Air Horn Gag to Scare Those Trick-Or-Treaters”
[TheChadster] was kind enough to explain that the air horn he attached to his bicycle is not actually as loud as a train horn. This one can only be heard from a half a mile away. But we’re sure the ringing in your ears will seem the same… the video after the break proves this thing is way too loud.
You don’t need much for this, just a pair of air horns and a source of compressed air. [Chad] has a ten gallon air tank strapped onto the luggage rack on the back. We’d bet he can lay on the horn for quite a while before depleting that reservoir. The hardest part of the build (other than sourcing the parts without breaking the bank) is going to be attaching everything to the bike. This is why he recommends using a cruiser bicycle because they often already have a rack on the back. For the horn holder [Chad] found a leather cup holder worked almost perfectly.
We think he needs to turn this around and add some compressed combustibles for a fiery and noisy flame boost.
Continue reading “Add a train horn to your Hoopty (earplugs not included)”