General Description

The Channel Amplifier operates from a Microphone or Line source and raises the level of the incomming signal to 0 dBm for feeding into a 600 ohm load. The following frequency response correction operations are carried out and controlled by the channel amplifiers.

1. H.F. boost/cut

1. Presence (mid frequency cut/boost).
2. Low frequency cut/boost.
3. High pass filter.

The level of the incoming signal can be between –80 dBm and –20 dBm for a microphone input, or between –20 dBm and +10 dBm for line input. After amplification and signal processing the output level is 0 dBm.

The module contains two standard amplifiers BA284 and BA283 which are described seperately.

A Mic input +
B Mic input -
E 0 volts dc
F Line input +
H Line input -
P Line output unbalanced +
R Line output +
T Line output -
U 24 volts dc +
V Ground

Note: