(See related pages)
|
|
|
| In a stereo, radio, or television, the input signal is small. After several
stages of voltage gain, however, the signal becomes large and uses the
entire load line. In these later stages of a system, the collector
currents are much larger because the load impedances are much
smaller. Stereo amplifier speakers, for example, may have an
impedance of 8 Ω or less. As indicated in Chap. 6, small-signal transistors have a power rating of less than 1 W, whereas power transistors have a power rating of more than 1 W. Small-signal transistors are typically used at the front end of systems where the signal power is low, and power transistors are used near the end of systems because the signal power and current are high. |