Specifications

ManualsBrandsShure ManualsMicrophones and systemsS3

222 HARTREY AVE., EVANSTON.

IL.

60204 U.S.A.

MODEL M62V

AREA CODE 312/328-9000

CABLE: SHUREMICRO

SHEET

AUDIO LEVEL CONTROLLER

DATA

MODEL M62V AUDIO LEVEL CONTROLLER

GENERAL:

The "Level-Loc" Audio Level Controller is basically a

low-noise preamplifier with unity gain from the micro-

phone level input to the microphone level output or

60 dB of voltage gain from the high-impedance micro-

phone level input to the auxiliary level output. The

input and microphone level output contain matching

transformers so either high- or low-impedance oper-

ation may be selected. In addition, a high-impedance

auxiliary output is provided capable of driving any

high-impedance amplifier, mixer or tape recorder input

requiring 1 volt or less. This preamplifier has the ad-

ditional capability of reducing its gain as the input

signal increases, thereby holding the output signal

constant. After a predetermined input level threshold

is reached the output level is "locked", that is, it

remains constant even if the input signal increases

by as much as 100 times (40 dB). This reduction in

gain, which results in a constant output level, is

obtained without introducing significant distortion or

transients into the program material. The DISTANCE

SELECTOR switch determines the input level at which

gain reduction (Level-Loc action) begins. An INPUT

LEVEL control is also provided that:

1. Can be used as a vernier control to allow fine

adjustment of input threshold between the preset

threshold levels selected by the DISTANCE

SELECTOR switch.

2. Can act as an input attenuator for signals that

are higher than normal microphone levels. Such

inputs may be: signals from microphones used

very close to the mouth, outputs from preampli-

fiers, line amplifiers, tuners or tape recorders.

The Audio Level Controller:

Reduces blasting or large volume increases

when a speaker or entertainer varies his dis-

tance and position from the microphone.

Upgrades tape-recording systems and the Audio

portion of Video Tape Recorders, by controlling

the maximum signal level being fed to the re-

corder. This prevents distortion and overloading

of the tape recorder which might be caused by

"close talking" the microphone, or by very loud

vocal or musical passages.

Permits any number of microphones to be used

a paging system or conference arrangement,

without setting the level for each individual

microphone. (For paging systems only

low-impe-

dance microphones with normally open switches

should be used.) Any number of these micro-

phones may be operated in parallel across the

low-impedance input of the

M62V, the Audio

Level Controller will automatically set a fixed

maximum paging level that cannot be exceeded.

SPECIFICATIONS

lnput lmpedance

(below threshold):

High Impedance: 50 kilohms

Low Impedance: 300 ohms (for 25 to 600 ohm

sources)

lnput Levels:

High Impedance: Microphone level to 10 volts

max. (using INPUT LEVEL

control)

Low Impedance: Microphone level to

.2 volt

max. (using INPUT LEVEL

control)

Output Impedance:

High lmpedance Microphone Level:

3.3

kilohms

Minimum recommended load:

kilohms

Low lmpedance Microphone Level: Less than 50

ohms

Minimum recommended load:

ohms

Aux. Output: 10 kilohms

Minimum recommended load: 10 kilohms

Gain Characteristics:

I Below threshold, INPUT LEVEL

control maximum (10) DISTANCE SELECTOR in

"18" or More" position; measured from input to

output]

Frequency Response:

i2 dB 40 to 20,000

INPUT

Hi Imp. Mic.

Lo Imp. Mic.

1976,

Shure

Brothers

Inc.

27A823 (PC)

Printed

U.S.A.

OUTPUT

Imp.

Mic.

Unity

+20 dB

Imp.

Mic.

-20 dB

Unity

Aux.

Output

+60 dB

+80 dB

Summary of content (6 pages)

PAGE 1
2 2 2 HARTREY AVE., EVANSTON. IL. 6 0 2 0 4 U.S.A. @ AREA CODE 3 1 2 / 3 2 8 - 9 0 0 0 .
PAGE 2
Maximum Output Noise (HI IMPEDANCE MIC. OUTPUT, in dB below 1 volt): 300-20.000 H z (Noise) 30-20,000 H z ( H u m a n d Noise) Lo Imp. lnput 150 ohm Termination -103 dB -95 dB Hi Imp. lnput 33 kilohm Termination -104 dB -95 dB switch above the receptacle. This output is designed to work into a 25- to 600-ohm microphone line or microphone input, or into a high-impedance amplifier or tape recorder microphone input. The receptacle is a professional three-pin male audio connector.
PAGE 3
CONTROLS AND OPERATION MASTER CONTROL: With the MASTER CONTROL in the "Bypass" position: 1. The battery is disconnected from the "Level-Loc" circuitry and thus the level-controlling action of the M62V is inoperative. 2. The AUX. OUTPUT is disabled. 3. The input to the M62V is switched directly to the MIC. LEVEL OUTPUT so in this "Bypass" condition the unit can serve as a microphone line matching transformer.
PAGE 4
control is used; however, the appropriate attenuation must be added to the Input Voltage (Horizontal) Scale. For example, if the INPUT LEVEL control is set to "5" aproximately 20 dB should be added to the input voltage figures, so the point marked -60 dBV on the input voltage scale (Horizontal) would become -40 dBV. In other words, the entire curve would be shifted 20 dB to the right. TO USE WlTH SHURE M68 SERIES MICROPHONE MIXERS: The two ways of using the M62V with the M68 Series Mixers are: 1.
PAGE 5
A68L LOCKING PANEL The A68L Panel fastens over the controls of the M62V, M63, M67 or M68 Series Mixers, locks in place with a padlock (supplied), and prevents tampering with controls once they have been set. The A68L Kit contains locking panel, small padlock and two keys.
PAGE 6
CHASSIS GROUND h CIRCUIT COMMON I-. 3. THE FOLLOWING SYMBOLS DENOTE: 2. ALL RESISTORS 5 10% TOLERANCE AND 1/4 WATT UNLESS OTHERWISE SHOWN. NOTES : I. ALL CAPACITORS I N MFD AND 100 VOLTS OR MORE UNLESS OTHERWISE SHOWN. ELECTROLYTIC CAPACITORS SHOWN IN MFD x VOLTS. POWER 28 V.D.C. TI FIGURE 6 - MODEL M62V AUDIO LEVEL CONTROLLER CIRCUIT DIAGRAM B+ DISTANCE SELECTOR A+ =- 46A021 9082150 55A54 55A120 55A62 RI TI.T2 SI.S2 S3 54 - - 86A335 86A329 96.