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.
Over the course of the history of the piano, you can find many different versions of pianos with many different numbers of keys. By the mid-1800s, pianos had expanded to a full seven octaves. In the late 1880s, popular piano manufacturer Steinway created the 88-key piano that is the standard today.