Introduction
1-1
C H A P T E R
1
Introduction
Welcome to the Larson Davis Model 2221 Microphone
Preamplifier Power Supply. The Model 2221 provides
power for a microphone preamplifier, a microphone bias
voltage of 200 V for use with traditional air condenser
microphones (which can be switched off for use with
prepolarized microphones) and up to 50 dB of gain to
optimize the level of the output signal. It can be powered
by internal or external batteries or an external DC
voltage. It is characterized by low noise level and
distortion and the ability to drive very long cables, input
and output.
About This Manual
This manual has 3 chapters and 1 appendix covering the
following topics:
•
Chapter 1 - Introduction:
Orients the user to the
contents of this user manual and the features, functions
and measurement capabilities of the Model 2221. It also
includes instructions on unpacking the Model 2221.
•
Chapter 2 - Description:
Provides a physical
description of the Model 2221.
•
Chapter 3 - Operation:
Describes the setup and
operation of the Model 2221.
•
Appendix A - Specifications:
Presents the technical
specifications of the Model 2221.