Material based on the methodology for creating magnetoplanar emitters for headphones and speakers. The approach has a wide range of applications, not only for the creation of electroacoustic systems. For example, for flexible cables instead of torn ones, antennas and other things, for which there is enough imagination and patience. One of the options for using the photoresist method instead of the popular LUT
Introduction
It all started with a search for, if not perfect, then a good sound. In my previous article, I made a link to this development and promised to release this article. Just want to thank the community of enthusiasts who create magnetoplanar emitters, who inspired me to create another bicycle. And also a belated thanks to a previous article, again for inspiration, to the tape driver community . But, however, I will return to the topic.
The need for a thin flexible printed circuit board (PCB), which is, in fact, a magnetoplanar coil, can arise in many places and many people. In the case of a large series of products, the most reasonable step is to order from a large manufacturer, but in the earlier stages of work it seems very reasonable to create this board yourself.
However, this lesson requires a very significant investment of effort, money and time, so there is still a lot to talk about optimality. My approach is compatible with very, very thin films and metal layers, and it also has a very high accuracy. True, this accuracy is in fact limited by a huge bunch of factors, which, nevertheless, can be fought with. A theoretically unavoidable limitation is the resolution of a photoresist, ordinary sheets of which have an index of something on the order of 50 microns. Of course, in garage conditions this is an unattainable utopia; for an indicator of at least 100 microns, conditions are needed that approach the so-called. clean room... As a result, you can usually get boards with a track width of about 0.3-0.2 mm in a sufficiently prepared place, relatively clean (no cats!) And with all the tools.
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