Breadboards, PCB prototype boards and audio amplifier boards.
Breadboards let you build and test circuits without soldering, which is ideal for prototyping, learning and experimenting with Arduino and other microcontrollers. PCB prototype boards (perfboards and stripboards) let you build permanent circuits with soldering after testing on a breadboard. Amplifier boards boost audio signals to drive speakers, which is popular for DIY speakers, Bluetooth speakers, car audio and home audio projects. Check the size, number of tie points or holes and the amplifier's power output and voltage before ordering. Class D amplifier boards are efficient and run cool.
Crossovers: audio crossovers.
Related categories: DIY Parts & Components (Consumer Electronics), Switch (DIY Parts & Components), Module