On Search Results page use Filters found in the left hand column to refine your search. Analog Devices offers dual and quad transistors with excellent matching characteristics. Offset voltages, temperature drift, and hFE matching are individually tested to data sheet specifications. Device performance is guaranteed over industrial and military temperature ranges. Each of these devices is an excellent choice as an input stage for an amplifier or in log/antilog circuits. ADIâs matched transistors offer low noise and high gain, with characteristics approaching an ideal transistor.
The first piano was invented in Florence, Italy in 1700 by Bartolomeo Cristofori (1655  1732), a craftsman who repaired harpsichords for Italys royal court.
Introduction to Upright Pianos. The first square shaped piano was invented by Frederici of Gera, followed shortly by Johannes Zumpe. In the nineteenth century, John Isaac Hawkins of Philadelphia developed the upright piano and the iron frame. This frame could hold the tension of thicker strings, giving the piano a bigger, richer sound. Upright pianos come in many sizes. The Spinet Piano was first produced around 1935.