Shure Headphones 527C User Manual

Model 527C User Guide  
CONNECTIONS  
A typical external operating circuit is shown in Figure 1. Circuit  
parameters such as supply voltage, load, current and sensitivity  
may be selected using the curves shown in Figures 3 and 4. If, for  
instance, the available supply voltage is 16 Vdc and a current drain  
of 4 mA is desired, a load resistance (RL) of 2.2KΩ is necessary.  
With a supply voltage of 16 Vdc and a load resistance of 2.2KΩ, the  
relative sensitivity is approximately +8 dB, or –3 dB output level ref-  
erenced to the specified output level of –11 dB with 10 Vdc and a  
470Ω load.  
WIRE COLOR  
BLACK  
FUNCTION  
AUDIO GROUND  
AUDIO  
RED  
GREEN  
WHITE  
RELAY CIRCUIT  
Transistorized Dynamic Hand-Held Microphone  
CABLE-TO-CONNECTOR WIRING  
The Shure Model 527C is a dynamic hand-held communica-  
tions microphone for use in a variety of mobile and fixed-station ap-  
plications, including police, transportation, amateur radio and  
similar applications. The 527C offers extremely low sensitivity to  
hum pickup and low susceptibility to radio-frequency interference.  
A built-in solid state amplifier permits the use of up to 30 m (100 ft)  
of unshielded cable. The modular construction of the 527C allows  
the cartridge, switch, and cable to be replaced in a matter of min-  
utes, if necessary. The 527C fits naturally and comfortably in the  
hand and is not adversely affected by heat or humidity. The  
TABLE 1  
MICROPHONE  
CARTRIDGE  
5
F
RED (+)  
LOAD RESISTANCE  
+
SUPPLY  
R
VOLTAGE  
L
V
AUDIO  
AMPLIFIER  
S
OUTPUT  
BLACK (–)  
GREEN  
WHITE  
TRANSMIT  
RELAY  
CIRCUIT  
®
ARMO-DUR case is immune to oil, grease, fumes, salt spray,  
sun, rust and corrosion, and is outstanding in its ability to withstand  
mechanical shocks and vibration.  
SWITCH  
TYPICAL OPERATING CIRCUIT  
FIGURE 1  
FEATURES  
CAUTION:  
To avoid damage to the 527C, observe the following:  
Built-in amplifier  
Frequency response from 300 to 5,000 Hz, tailored for voice  
Supply voltage (V) must be between 4 and 35 Vdc. Voltages ex-  
ceeding 35 Vdc may substantially reduce the life of the micro-  
phone. Voltages below 4 Vdc are not sufficient for microphone  
amplifier operation (although no damage will occur).  
communications  
Low sensitivity to hum  
Low susceptibility to radio-frequency interference  
“Million-Cycle” leaf-type switch stands up under severe oper-  
Do not exceed the maximum allowable current (dissipation lim-  
it) for the various combinations of supply voltages and load re-  
sistances.  
Maintain proper polarity for the red (+) and black (–) leads as  
shown in Figure 1.  
ating conditions and constant use  
®
High-impact ARMO-DUR case—lighter and stronger than  
die-cast metal, comfortable to the touch in hot or cold weather  
Rugged and dependable under all operating conditions  
Long-life neoprene-jacketed coil cord  
©2005 Shure Incorporated  
Printed in U.S.A.  
5
27C2084 (Rev. 5)  
 

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