Editing Preamplifier (section)

==Audio systems==
In an audio system, they are typically used to amplify signals from analog sensors to [[line level]]. The second amplifier is typically a [[power amplifier]] (power amp).  The preamplifier provides [[voltage]] gain (e.g., from 10 mV to 1 V) but no significant [[Electric current|current]] gain. The power amplifier provides the higher current necessary to drive [[loudspeaker]]s. For these systems, some common sensors are [[microphone]]s, [[pickup (music technology)|instrument pickups]], and [[phonograph]]s. Preamplifiers are often integrated into the audio inputs on [[mixing console]]s, [[DJ mixer]]s, and [[sound card]]s. They can also be stand-alone devices.