Panasonic BB-HCM311 Operating Instructions Manual page 40

Operating Instructions
External Microphone
External Speaker
• The cables for the external microphone and external speaker must be
shielded, and less than 3 m long. Using nonstandard cables may cause sound
interference due to strong radio waves.
• The external microphone input terminal does not correspond to a line level.
Audio may be distorted when the line level is input. Audio distortion will be
solved if you insert the following circuits. Under no circumstance should high
level audio, such as from a speaker, be connected to this input terminal. Doing
so is likely to damage the camera.
External Microphone
Input Terminal
40
Cable diameter :
For Microphone
Camera
2 0.3 mm or below
3.5 mm mini plug
(Plug-in power +3.3 V)
3.5 mm stereo mini plug
(Output impedance 560
Resistor
33 K
line level)
For Speaker
Capacitor
Audio Line
Out
1 F
GND
Signal
GND
Not
Connected
Signal