Studio-technologies 40 Uživatelský manuál stáhnout pdf (Strana 22)

Model 40 User Guide Issue 1, July 1994

Studio Technologies, Inc. Page 23

integrated circuit operational amplifier via

resistors and a switch which performs the

mono function. In the mono position the

switch connects the left channel signal to

the right channel amplifier, and drops the

level by 6dB. The op amp is configured as

a summing amp, allowing the signal from

the cue mix pot to be summed (mixed)

with the signal from the talent preamplifier.

The op amp, along with two transistors

and supporting components form the left

channel output stage. A low pass filter in

the feedback loop is included for stability.

The amplifier’s output is capacitor coupled

via a series resistor to the output connec-

tor. The capacitor changes the audio

output signal from being biased by the

+9.5V reference voltage to being biased at

signal common. The series resistor limits

the output current in the event of a shorted

output load.

Specifications

Model 40 Central Controller

Mounting

One space in a standard 19-inch (48.3cm) rack

AC Mains Requirement

100, 120, or 220/240V, ±10%, factory configured,

50/60Hz, 100-120V 0.4A maximum, 220/240V

0.2A maximum

Fusing

Qty: 1

Type: 5 x 20mm time lag (Littelfuse 218-series or

equivalent)

Rating: 0.400A for 100 and 120V mains power,

0.200A for 220/240V mains power

Connectors

Audio Inputs: dual, ¼-inch, 3-conductor phone

jacks, gold-plated contacts. (Manufactured

by Neutrik.) Mates with all plugs specified by

EIA RS-453.

Talent Amplifier Output Groups: 3-pin XLR-type,

male (Neutrik)

AC Mains: standard 3-blade plug, meets IEC 320

specifications

Audio Inputs

Qty: 2, stereo (separate left and right input

connectors)

Type: electronically balanced, direct coupled,

compatible with balanced or unbalanced signals

Impedance: 50k ohms

Nominal Input Level: –10dBV to +10dBu

Input Level Control: allows calibration over –10dBV

to +10dBu input range

Maximum Input Level: +27dBu balanced, +21dBu

unbalanced

Common Mode Rejection: 100dB @ DC and 60Hz,

70dB @ 20kHz, 62dB @ 40kHz (typical)

Talent Amplifier Outputs

Application: provides power and audio signals for

two groups of up to 4 Model 35 or Model 38 Talent

Amplifiers (total 8 talent amplifiers). The output

connectors (3-pin XLR-type, male) have common

on pin 1, +23Vdc modulated with left channel

audio at –10dBu on pin 2, and right channel audio

at –10dBu on pin 3. Maximum output current

200mA (nominal)

Frequency Response, Distortion (THD+N),

S/N Ratio: refer to Model 35 and Model 38

specifications

LED Indicators

Qty: 7, power present, signal present (4), over

current (2)

Dimensions (Overall)

19.00 inches wide (48.3cm)

1.72 inches high (4.4cm)

8.75 inches deep (22.2cm)

(1 standard rack space)

Weight

8.8 pounds (4.0kg)

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