Protech-audio 891 Manuel d'utilisateur télécharger pdf

MODELS COVERED

INTEGRA III SYSTEM

The overall attenuation range of the VCA cards may be

modified in the field, by using a series resistor and changing the

value of the remote potentiometer.

The input sections are followed by a summing amplifier, on

mixing units, and then by a line amplifier circuit (on all models)

depending on the model selected. The output section is

transformer isolated with a high quality, 600 ohm line

transformer.

All units may be linked together to create larger mixing

networks. Both the audio output, and the link output may be

strapped for PRE or POST VCA. This feature allows the audio

output level to be remotely controlled, while the link output is

fed to other units at full volume, or the link output level may be

post VCA while the main output remains at full volume. This

PRE/POST VCA feature is particularly useful when logging

recorders are used.

Both models are designed to mount in the Models 857B or the

858B Card Frame Packages. The all VCA units may be mixed

or matched with other INTEGRA III SYSTEM cards to create

a complete audio system. The Model 858B will allow mount-

ing of 9 cards and an internal power supply. The Model 857B

will allow mounting of up to 10 cards with an external power

supply.

The Models 891 to 898 Remote Controlled Audio Cards are

designed to operate with either microphone or line level

input signals, with remote volume control, and are intended

for use in professional audio systems.

Typical applications are public address systems, court-

rooms, sales presentation rooms, headphone listening

systems, and recording systems. The actual application of the

amplifiers is found in buildings such as airports, factories,

courthouses, casinos, convention centers, libraries, hotels,

racetracks, training systems, corporate boardrooms, etc.

The models 891, 892, 893, and 894 have line level inputs.

The models 895, 896, 897, and 898 have microphone

level inputs. All inputs are transformer isolated. The gain of

each input stage is adjustable via a trimpot mounted on the

backplane assembly. The gain adjustment is independent of

the attenuation adjustment.

The attenuation is accomplished using an on-board VCA

(voltage controlled amplifier) circuit in each input section.

The VCA is controlled via a 0-5 volt DC control signal,

generated on-board, which is adjusted by a remotely mount-

ed 10K linear potentiometer. The default for the attenuation

is zero volts = zero attenuation. This default prevents loss of

signal if the control wires are accidentally cut.

PROTECH

891

892

893

894

INSTALLATION & OPERATION MANUAL

MODEL 891 - 898

REMOTE CONTROLLED AUDIO CARDS

www.protechaudio.com

INTEGRA III SYSTEM

PROTECH

CONNECTOR & TRIMPOT DRAWING

MODELS 892, 893, 894, 896, 897, 898

NOTES:

INPUT #1 HI

INPUT #1 LO

SHIELD

POTS (2) HI

POT #1 ARM

SHIELD

LINK OUT

OUTPUT #1 HI

OUTPUT #2 HI

OUTPUT #1 LO

OUTPUT #2 LO

POT #2 ARM

POTS (2) LO

TYPICAL OF EACH OUTPUT

INPUT #2 HI

INPUT #2 LO

CH #2

GAIN

CH #1

GAIN

857B & 858B Backplane Connections

SUMMED OUTPUT

895*

896*

897*

898*

*Microphone Level Inputs

Model 894A Shown

1/06

Protech Audio Corporation, PO Box 597, 192 Cedar River Road, Indian Lake, New York, 12842, Voice 518-648-6410 Fax 518-648-6395

1 2

INSTALLATION 2
ALIGNMENT 2

Résumé du contenu

Page 1

MODELS COVEREDINTEGRA III SYSTEMThe overall attenuation range of the VCA cards may bemodified in the field, by using a series resistor and

Page 2 - ALIGNMENT

INSTALLATION3- Terminate all audio input and output connections, usingthe card connection drawing on the facing page. Doubleconductor shielded cable i

Modèles reliés 895 | 892 | 896 | 893 | 894 | 897 | 898 |

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Protech-audio 891 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Audio Protech-audio 891. Protech Audio 891 User Manual Manuel d'utilisatio

Résumé du contenu

Modèles reliés 895 | 892 | 896 | 893 | 894 | 897 | 898 |

Commentaires sur ces manuels

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