Ezra Spencer of the Mixed Signal makes all manner of interesting audio devices, and for his latest video he decided to use an EZ Fan2 transistor breakout board purchased from Tindie! This tiny board–which I actually designed and sell–was originally meant as an “EZ” way to control cooling fans using a Raspberry Pi. In reality they can be used with small loads that don’t exceed the MMBT2222A transistor’s limitations and cooling needs.
Ezra decided to use this device when attempting to construct a custom 3D-printed speaker. His design, however, turned out to work better as an audio exciter–a device that sticks on to another surface and uses it as the speaker cone. Here coils are wound around a fixed base, and a magnet is attached to the flat speaker/exciter surface. This is sort of the inverse of most modern speakers, which instead place the magnet on the base and the coils on the vibrating cone.
To excite this contraption, Ezra employed the EZ Fan2 to simplify its wiring. He notes that he can “pretty much just throw it inline with the wiring harness and not have to worry about it too much.” It’s a fun little project, and fits in nicely with his other robo-musical builds. Be sure to check out this experiment in the video below, and you can peruse his channel for much more robo-audio exploration.
Of course, this certainly isn’t the only interesting project made using Tindie-sourced parts. We’d love to feature more builds, so feel free to ping us on Twitter @tindie with your ideas, or you can find me @JeremySCook.