Analog Output Board, 5 Pin

Analog Output Board, 5 Pin

Output Board - v2*

4.1 Overview

This circuit board provides the following console functions:

Line output amplifi cation

Cue amplifi cation

Headphone amplifi cation

External Inputs (balanced *)

Monitor sends (balanced *)

Meter and peak LED functions

Level sets for all functions

Muting and timer reset functions

Power supply interface

Talk back circuitry (balanced *)

Illustration 0-1-(v2) provides a complete layout of all connectors, level set locations, and all user connector pin-outs.

4.2.1 Program and Audition Outputs

The program and audition outputs provide identical stereo performance, are active balanced, and factory calibrated, with a 600 ohm load, to provide +4dBm when the front panel VU meters read

“0” VU. This will provide in excess of 20dB of headroom. Adjustments for output levels, meter calibrates, and peak LED trip points are provided on the Output Board, so that other output levels maybe set.

The outputs will drive a 600 ohm load or higher. The outputs are connected via fi ve position screw type barrier strips or RJ-45 connectors, which are mounted onto headers J30 (Program), and

J29 (Audition), located on the Output Board.

It is recommended that two conductor shielded cable, or two pair shielded cable be used in wiring all balanced audio inputs to the console. Use STP patch cords when wiring the RJ-45 verision. To minimize RF interference and ground loops, the shields should be tied to ground only at one end of the cable.

If an unbalanced console output is required, single conductor shielded cable or two conductor shielded cable with a foil shield around each conductor should be used. The audio should be taken from the + Output terminal, while the shield should be connected to Ground. In this case, the shield is connected at both ends of the cable. There should be no connections to the - Output.

In this confi guration, the console output will provide -2dBm into a 600 ohm load when the front panel VU meters read “0” VU.

*shipped after 09/2003

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4.2.2

4.2.3

Telephone Output

The Telephone Output is connected to a fi ve pin screw type barrier strip or RJ-45 connector mounted to Telephone Output header J33, on the Output Board.

The two Telephone Outputs provided are in parallel, from the same amplifi er. The combined load on the amplifi er from both mono sends should be no less than 600 ohms.

In other aspects, the performance and connections to the Telephone Output are identical to the program and audition outputs.

External Monitor and Headphone Inputs

Four balanced, stereo, high impedance (4.7K ohm) inputs are provided which feed both the headphone and the monitor amplifi ers. These inputs are connected to headers J19 (external input

1), J20 (external input 2), J25 (external input 3), and J26 (external input 4) on the Output Board.

Connections are made via fi ve position screw type barrier strips or RJ-45 connectors, which are mounted onto the headers.

Two conductor shielded cable with a foil shield around each conductor should be used.

These inputs are intended mainly for air signal monitors, or for the connecting of other external monitor sources. Input level trims for each of these inputs are provided on the Output Board.

Two headphone outputs are provided. The fi rst is available at a stereo, quarter inch, phone jack which is factory mounted to the front panel. This output is capable of driving 8 ohm or greater loads. D0 NOT USE MONO HEADPHONES. The output signal is selected by the front panel headphone or monitor switches and level adjusted by the front panel headphone level control.

The second headphone output is stereo, balanced, and high level (lv RMS typical). It will drive loads of 2K ohms or greater. This output, which is intended for connection to an external headphone amplifi er, follows the input selection switches but is not affected by the front panel headphone level control.

Connections are made via a fi ve position screw type barrier strip or RJ-45 connector on

Headphone header J11 on the Output Board.

Single conductor shielded cable or two conductor shielded cable with a foil shield around both conductors should be used.

Three stereo, balanced, high level (lv RMS typical) are provided. Each output will drive loads of

2K ohms or greater. The outputs are Dimmed

Monitor (controlled by Mute 1), Muted Monitor (controlled by Mute 2), and Unmuted Monitor.

All outputs follow the monitor selection switches but only the Dimmed Monitor is affected by the front panel monitor level control.

Connections are made via fi ve position screw type barrier strips or RJ-45 connectors, which are mounted onto the monitor headers on the Output Board as follows.

Output Board Header Monitor Output

J12

J15

J16

Dimmed Monitor (Mute 1)

Muted Monitor (Mute 2)

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Single conductor shielded cable or two conductor shielded cable with a foil shield around both conductors should be used.

All monitor outputs are intended to drive external monitor amplifi ers. The Dimmed Output, controlled by Mute 1, (which also mutes the Cue speaker) is intended to feed the control room monitor amplifi er where the console is located. When the Mute 1 buss is enabled, the output from the Dimmed Output will be reduced to a level set by VR13 located on the Output Board. This level may be set to maximize (for full muting) or, alternatively, to a level just below the feedback threshold of the speakers.

The Muted Output is intended to feed any other room which that contains microphones connected to the console.

If it is desirable to feed all studios from a common amplifi er, this amplifi er should be fed from the

Unmuted Monitor Output. External relays driven by the muting contacts on header J7 could then be used to provide the necessary muting of the signal.

4.3.1

4.4

Mute and Timer Reset Bus Connections

A fi ve position quick-connect type barrier strip maybe mounted onto Mute/Timer header J7 on the

Output Board to provide external mute and timer reset functions.

The bus outputs are open collector current sinking outputs, maximum +24vdc open circuit voltage,

80ma. If the busses are to drive external relays, install EMF suppression diodes across the relay coils. Do not exceed 150ma draw from the +15v supply.

An interface relay is optionally available from Radio Systems. Illustration O-2 shows the wiring of his relay for external tally lights.

The Timer Reset Bus activates only during the fi rst 100ms after a mixing channel, with its Timer

Reset Jumper(s) installed, is placed in the “on” mode. Repeated depressing of the “on” switch after the mixing channel has turned “on” will result in additional pulses on the Timer Reset Bus.

Talk Back Connections

The talk back circuit has two sections, send and receive. The send section will output any signal applied to its input when the front panel Talk Back Switch is depressed. Return signals are applied to Cue Buss for operator monitoring. A trim pot on the Output Board is provided to set the external cue input level.

Talk back connections are made via 2 fi ve position terminal strips, titled to Talk Back Output header J36 and Talk Back Input header J37 on the Output Board.

Under normal applications, the output of the DJ mic is wired to the talk back send input terminal on J37. This is accomplished by connecting terminal 4 from patch point connector J8 of the DJ mic channel to terminal 1 of the Talk Back connector, and shorting terminal 2 (-) of the Talk Back

Connector to terminal 3 (G).

Talk Back Output connector J36 also contains terminal 4 labeled "CTL", which is pulled low whenever the front panel talk back switch is depressed. This is useful for switching external intercom or control circuits. It may also be used to remote trigger the console front panel

Talk Back switch.

Illustration O-3 - Version 2 shows how this confi guration would be used to wire two Millenium

Consoles for talk back communication utilizing the DJ mic channel and cue circuit external inputs.

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4.5

4.5.1

The talk back system can also be used to communicate with up to four 2-way speakers in studios or control rooms that do not have Millenium Consoles. For this application, Radio Systems provides a squawk box amplifi er card. Consult the Interface Options and Accessories section of this manual for detailed information.

Internal Adjustments and Input Level Calibration

The following level trim adjustments are available internal to the console.

1. mix bus output level

2. VU meter “0”

3. peak LED trip point

4. input level for external monitor inputs

5. input level for external cue bus input

6. distortion adjustment for all VCAs

The console was factory calibrated as follows, and will not require re-calibration unless alternate levels are desired.

1. With a +4dBv input and the fader set to the “0” position, the console will provide

+4dBm output into a 600 ohm load. In addition, the VU meters will read 100% or 0

VU.

2. The peak LED trip point was calibrated to illuminate the LED when the peak output level reaches +2 dBv.

3. The external monitor inputs were calibrated to provide a lv RMS output with a lv

RMS input.

Mix Bus Output Level Adjust

The console was calibrated at the factory for an output level of +4dBv, into 600 ohms, when the

VU meters indicate “0”.

Perform the following steps on the Six Channel Audio Board to verify or change the calibration.

1. Select a high level input with no DIP component carrier inserted into attenuator headers J3 or J4. In addition, there should be no jumpers installed onto gain select headers J5 or J6.

2. Disconnect any inputs to the left or right A input.

3. Connect a l kHz, +4dBv, balanced sine signal to both the left and right A inputs.

Select input A, select all mix buses, turn the mixing channel “on”, and set the fader to "0".

Perform the following steps on the Output Board.

1. If the console outputs will normally be terminated, place an equivalent termination onto each program and audition output. In addition, place a termination onto one of the Mono outputs.

2. Connect a high impedance, balanced voltmeter across the + and - Left program output.

3. Adjust the left channel output level trimmer so that the voltmeter indicates the desired output.

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4.5.2

4.5.3

4.5.4

4. Move the voltmeter, and adjust the right program output, followed by the left audition output, right audition output and mono output.

VU Meter “0” Calibration

The console was calibrated at the factory for an output level of +4dBv, into 600 ohms, when the

VU meters indicate “0”.

To calibrate the VU meter “0” indication:

1. Perform output level calibration as detailed previously.

2. Adjust the VU meter calibrate trimmers, located on the Output Board for a “0” reading on each meter.

Note: Six channel consoles share the same meters for program and audition monitoring. The front panel VU meter switch selects the signal to be displayed. Adjustment must be made with both switch settings.

Peak LED Trip Point Calibration

The console was calibrated at the factory for an output level of +4dBv, into 600 ohms, when the

VU meters indicate “0”, and for a peak LED trip point of +2VU. To perform Peak LED Trip Point

Calibration:

1. Perform output level calibration as detailed previously.

2. Perform VU meter “0” calibration as detailed previously.

3. Adjust oscillator to the desired peak LED trip point level (typically 0 to 3dB hotter).

4. Adjust the peak LED trip point trimmers to that the LEDs just illuminate.

Note: Six channel consoles share the same meters for program and audition monitoring. The front panel VU meter switch selects the signal to be displayed. Adjustment must be made with both switch settings.

External Monitor Input Level

There is a separate adjustment, located on the Output Board for each of the four stereo external inputs.

1. Connect a high impedance voltmeter to the unmuted monitor output.

2. Select a high level input, and reproduce the nominal level from a test tape, record or

CD.

3. Turn the mixing channel “on”, select the program mix buss, and adjust the fader for

“0” VU.

4. Depress the “program” monitor input switch.

5. Note the reading on the voltmeter.

6. Feed the nominal input level to any external input and select that monitor input switch.

7. Adjust the associated external input level trimmer until the voltmeter gives the same indication as in step 5.

8. Repeat steps 6 and 7 for all external inputs.

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4.5.5

4.5.6

Cue Bus External Input Level

The level adjustment for the external cue buss input is located on the Output Board.

1. Connect a high impedance voltmeter to the external cue speaker terminals.

2. Select a high level input, and reproduce the nominal level from a test tape, record or

CD.

3. Place the mixing channel into “cue”, and adjust the cue level control VR2 for normal listening level.

4. Note the reading on the voltmeter.

5. Feed the nominal input level into the external cue input.

6. Adjust the external cue input level trimmer until the voltmeter gives the same indication as in step 4.

VCA Distortion Null Adjustments

These adjustments are factory set and should only require adjusting if a VCA is replaced. Consult the Theory of Operation and Troubleshooting Section for detailed directions.

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Illustration O-1 -v2*

OUTPUT AND METER BOARD - 5 Pin Version

Description

Mix buses terminate on this board, which provides all line amplifi cation and meter drivers.

Power supply interface and external audio inputs also reside here.

W1

Note: To use TalkBack control pin (J36-4) to activate external relay, consult technical bulletin on StudioHub.com.

28

*shipped after Sept 2003

Illustration O-2 -v2*

OUTPUT AND METER BOARD - RJ-45 Version

Description

Mix buses terminate on this board, which provides all line amplifi cation and meter drivers.

Power supply interface and external audio inputs also reside here.

DIGITAL

Note: To use TalkBack control pin (J36-4) to activate external relay, consult technical bulletin on StudioHub.com.

29

*shipped after Sept 2003

Illustration O-3 - v2*

Auxiliary Control Relay Wiring

Connect the auxiliary relay (optional) (RS part#7699) to the console muting console muting connector as shown below for mute-1 or mute-2 control of air lights and other outboard equipment.

A solid-state model of this relay (RS part#9375) is also available. Note that this part is only supplied in single pole

(SPST) confi guration.

IMPORTANT NOTE: Take extreme care in wiring this relay to console connectors J7 to ensure that no hazardous (110V) voltage is applied to pins on this connector.

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*shipped after 09/2003

Illustration O-4 -v2

Talkback Wiring*

(Using two Millenium Consoles)

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