Page 86 VRC2000 Installation and Operations Manual
Technical or Setup Assistance
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• Condenser Problems
The VRC2000’s built-in condenser microphone is very sensitive. If the
VRC2000 is to operate in a noisy environment, a gain adjustment in the
condenser-microphone circuit may be necessary.
Attenuation of 24dB in the microphone’s output can be obtained by
opening R35 to make U15C a voltage follower. Further changes in the
microphone level can be made by varying R31 and R30 in the next stage
of amplification, Ul5B. VRC2000 users may opt to connect other audio
sources to this input.
The circuit presented in Figure 26 (below) depicts the amplifier used to
boost the microphones level.
Maintenance/Service
Continued
Figure 26. Microphone amplifier schematic
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