Click here to purchase the entire book in PDF format. Slew Rate In theory, an op amp is able to accurately and instantaneously output a signal which is a copy of the input, with some amount of gain applied. If, however, the resulting output signal is quite large, and there are very fast, large changes in that value, the op amp simply won't be able to deliver on time. For example, if we try to make the amplifier's output swing from -10 V to +10 V instantaneously, it can't do it - not quite as fast as we'd like, anyway... The maximum rate at which the op amp is able to change to a different voltage is called the ``slew rate'' because it's the rate at which the amplifier can slew to a different value. It's usually expressed in V/$\mu S$ - the bigger the number, the faster the op amp. The faster the op amp, the better it is able to accurately reflect transient changes in the audio signal. The slew rate of different op amps varies widely. Typically, you'll want to see about 5 V/$\mu S$ or more.