Thanks for everyone who attended, and it is great to see some new faces. This meetup was about combining efforts from the dedicated attendees! We're planning to have a 'Make day' on the 13th July because it is apparent that there is little time for this during the normal meetup times. Click here for a brief summary.
And we continue discussing bowls and saw blades, which do seem to becoming a major fascination among us. In fact, we're dedicating 13th July to a saw blade frenzy, anyone is welcome to join. If you happen to have any saw blades lying around, please don't hesitate to bring them along.
Dates of next meetups
Sun 13th July 12 pm - Saw blade Frenzy Make Day (Still to be confirmed)
Sun 27th July 7 pm - Usual meetup time
Note: I've uploaded some books and papers in the Goodies Folder. These may look incredibly technical and daunting at a glance, but they are great sources and amazing ideas, so check them out.
On a side note, there is an exponential horn exhibit at the science museum worth going to. And there is a visit to Sound Mirrors in Dungeness on 20th July (scroll to middle page for more info.), and a great article about recording.
Last meeting on Sun 25th marks one of our most successful meetings yet. It was overwhelming to witness such great attendance, with such a variety of people from different practices, ranging from visual artists and musicians to engineers and product designers. Below is an excerpt of the discussions that took place.
Piezos are an essential tool to pick up surface vibrations, and here at Acoustic Hacking, we love them for their abundant availability, simplicity and versatility in a wide array of applications. As you can see, this simple circuit [drawn by Tony, a guest practitioner], may be needed to remove the 'tinny' sound, an issue commonly associated with piezo discs. The piezo-electric material has very high impedance, and this circuit is designed to match the impedance to mic level input on your mixer or audio interface.
Another tip is to use a shielded cable, to further prevent hum or electromagnetic interference being picked up along the cable.
Other discussions included how to design a ball for the blind. Some example of such a device/ball are photographed above, sitting on the table. The idea is to design a highly resonant structure embedded at the core of the foam ball. This structure can either be activated by movement of the ball, or possibly the vortexes of air can be harvested through the crevices of the ball to vibrate this 'strucutre'; much like a whistle -- example of whistle footballs commercially available.
Quoting Tony from an email:
The machine is a Watkins Copicat Tape Echo, made in the 1970s and 80s, there were a number of slightly different designs, some with valves, some with variable tape speed, some using op-amps etc. My modification was to put the four playback heads at non-equal time differences along the tape, and to put two of them on a separate channel, to get an uneven stereo echo, which builds to create complex distorting stereo textures.
The thing that's perhaps interesting, electro-acoustically, is the piezo mic on the tape arm, which picks up the sound of wheel-scratching and actual physical tape hiss, which can then be mixed in with the main signal, or just use on its own so the thing becomes an instrument in its own right.
The piezo idea was prompted by a performance in Vienna in 2011 by Martin Blazicek and Andras Blazsek. The performance can be viewed here.
Also I wanted to share this link as part of the discussion. This is Michael Vorveld, from Berlin, who I also saw in Vienna. He uses light bulbs in series with bimetallic strips to generate performances like this.
I think the sound also comes from piezos, picking up the vibrations from the bimetallic strips as they switch on and off.
The concept of using bimetallic strips is very interesting and unexplored, possibility to look into this in future workshops!
Again, huge thanks for the people who attended and contributed to the workshop this time. Please stay tuned here for an updated agenda for next meeting, and possibly another guest practitioner. The meetings are held last Sunday of the month, so ext meeting is going to be on:
June 29th 2014 at 7pm
It is a possibility workshops might be arranged in between those meetings, those will involve more making! this will also depend on people's desires.
Any enquiries, please email [email protected], or join us on the London Hackspace mailing list thread.
