Circuit Description - Tait TM8000 Series Accessories Manual

Figure 6.2 Desktop microphone to radio interface
6.5

Circuit Description

TM8000 Mobile Radio Accessories Manual
March 2004 © Tait Electronics Limited
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The desktop microphone uses a dynamic microphone capsule and contains
a pre-amplifier (Q1) to boost the microphone level to that required by the
radio. Power for the pre-amplifier is provided by the electret microphone
bias circuit within the radio. R5 is used to adjust the gain.
PTT and hookswitch signals are combined onto one line and fed to the
control head PTT input of the radio.
TMAA10-01 Desktop Microphone 61