An integrated circuit (IC) on a printed circuit board. This is called a solid-state circuit because all of the electrical activity in the circuit occurs within solid materials.
^"Solid state device". Encyclopaedia Britannica online. Encyclopaedia Britannica Inc. 2017. Archived from the original on August 1, 2017. Retrieved December 5, 2017.
^Campardo, Giovanni; Tiziani, Federico; Iaculo, Massimo (2011). Memory Mass Storage. Springer Science and Business Media. p. 85. ISBN978-3642147524. Archived from the original on 2017-12-29.