In reflection of all materials used when sampling
electromagnet coils for our space saving speaker concept, it is clear to see
that the some materials are a lot more effective than others. Once we had found
a circuit structure that worked with our audio jack to produce sound, when
testing the materials we kept this a constant to eliminate any errors in the
circuit. This circuit started with the connection of the ground wire and ended with the connection of both the channel 1 and channel 2 wires.
Very initial samples were created using the BARE conductive
paint. All samples using this medium were unsuccessful in generating sound. We
are unsure as the why this was the result found. We thought that it may have
had something to do with the connection of the wires and the paint on the paper
but even when we used the copper conductive tape this made no difference to our
findings.
Samples that used conductive thread were able to produce a
very quiet sound. This could have been due to the size of the electromagnet
created in some of the sample yet when also considering the aesthetics of our
speaker; we felt that the tape would be most effective for our concept.
The copper conductive tape generated the loudest sound when
sampling. The tape was very consistent as all experiments were successful in
producing sound.
Samples also give evidence for the research surrounding the
topology of the speaker electromagnets. The majority of our samples use the
coil formation using the copper conductive tape as this was found to create the
loudest sound. Experiments with parallel structure were able to produce sound
get at a much smaller amplitude and volume than when coils were used. Samples
that used the sparse structure did not produce any sound at all. As a result,
through concept development we chose to continue to work with coil structures.