Lectrosonics UM400a User Manual download pdf (Page 10)

UM400a

LECTROSONICS, INC.

The wiring diagrams included in this section represent

the basic wiring necessary for the most common types

of microphones and other audio inputs. Some micro-

phones may require extra jumpers or a slight variation

on the diagrams shown.

It is virtually impossible to keep completely up to date on

changes that other manufacturers make to their products,

thus you may encounter a microphone that differs from

these instructions. If this occurs please call our toll-free

number listed under Service and Repair in this manual or

visit our web site at: www.lectrosonics.com

5-Pin Input Jack Wiring

Audio Input Jack

The Audio Input Jack for the UM400a is wired as shown

below:

PIN 1 Shield (ground) for positive biased electret lava-

liere microphones. Shield (ground) for dynamic

microphones and line level inputs.

PIN 2 Bias voltage source for positive biased electret

lavaliere microphones.

PIN 3 Low impedance microphone level input for

dynamic microphones. Also accepts hand-held

electret microphones provided the microphone

has its own built-in battery.

PIN 4 Bias voltage selector for Pin 3. Pin 3 voltage (0, 2

or 4 volts) depends on Pin 4 connection.

Pin 4 tied to Pin 1: 0 V

Pin 4 Open: 2 V

Pin 4 to Pin 2: 4 V

PIN 5 High impedance, line level input for tape decks,

mixer outputs, musical instruments, etc.

SM Equivalent Input Circuit Wiring

10k

To Virtual Ground

Audio Amplifier

BIAS

MIC

BIAS SELECT

LINE IN

GND

30uF

+5 VDC

Servo Bias

Pin 4 to Pin 1 = 0 V

Pin 4 Open = 2 V

Pin 4 to Pin 2 = 4 V

To Limiter Control

30uF

500 Ohm

100 Ohm

2.7K

200 Ohm

3.3uF

100 Ohm

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

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Lectrosonics UM400a User Manual Page 10

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