There’s something very attractive about a piece of equipment that needs no electrical power, and the passive phone speaker fits into that category. And of course the challenge for the DIY’er is to build one him/herself.
I decided to build one loosely based on the folded horn principle, after building three prototypes based on three wholly different principles, to compare their sound quality.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.