TM9100 Service Manual TMAA10-01 Desktop Microphone 447
© Tait Electronics Limited August 2005
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19.5 Circuit Description
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.
Figure 19.2 Desktop microphone to radio interface
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