Audio-developments AD255 Manual de usuario

CONTENTS SCENARIO 1 INTRODUCTION 3 UNPACKING 3 VISUAL INSPECTION 3 SPECIFIC POINTS

9 EQUALISATION HF: ±10dB @ 10kHz LF: ±10dB @ 100Hz MF: ±15dB CENTRE FREQUENCY 2k5Hz Q=1.2

10 TECHNICAL SPECIFICATION - MECHANICAL SIZE 6 I/P 8 I/P 10 I/P 12 I/P A 320 381 442 503 B 295 356 417 478

11 EQUALISATION CURVES AD 245 HIGH AND LOW EQ-20-15-10-50510152010 100 1000 10000 100000FREQUENCYdB AD 245 MID EQ AND HPF-20-15-10-50510152010 10

12 BLOCK DIAGRAM

13 CONNECTOR PANEL (1) Mono output XLR (2) Stereo output XLRs (L & R) (3) Reverse talkback preset (4) Mic

14 All input and output impedances and levels are to be found in the TECHNICAL SPECIFICATION. All inputs to, and outputs from AD255 are to be fou

15 Thus, a two-way conversation can take place between mixer and boom operator with the boom operator being able to listen to programme wh

16 MICROPHONE/LINE INPUT MODULE (9) Pre-fade listen (11) Direct out level

17 The Microphone/Line input module functions are as follows: Switch (1) selects 48V phantom and 12V tonader power for condenser micr

18 An overload LED (12) illuminates 3dB before clipping at the input to the fader. The Penny & Giles fader (18) is calibrated 10dB from it

1 SCENARIO Time was when it became necessary to update the ubiquitous AD145 PICO mixer. Our survey showed two main requiremen

19 OUTPUT MODULE (1) Meter 1 (2) Meter 2 (3) Auxiliary master potentiometers (4) Auxiliary to monitor (7) Limiter link (8) Limiter

20 This module controls the level of main and monitor output signals and metering of the output and monitor signals (including PFL). Calibration is

21 Line-up tone, when selected (9), replaces the normal signals on the main output. The frequency of the line-up tone may be selected between 1kHz

22 ADJUSTMENTS AND CALIBRATIONS Meters - are to broadcast specification and either a VU or a PPM may be selected. A choice of 3 scales is avail

23 PPM or VU setting - A DIL switch controls this function and is shown on the above diagram. When the switch is in its off position the meter follo

24 POWER SUPPLY UNIT TYPE AD100-015 The AD100-015 mains POWER SUPPLY UNIT is suitable for driving most of AUDIO DEVELOPMENTS’ range of p

25 CUSTOMER NOTES AND FACTORY MODIFICATION

26 TECHNICAL LIBRARY

2 Being latter-day converts, we have included circuitry to take full advantage of all M-S techniques - even shuffling - in both production and post-

3 INTRODUCTION Unpacking If there are any signs of damage to the outside of the carton, please notify us or your supplier immediately, regardless

4 Fuses - to protect the mixer and internal power supply are mounted on the power supply/converter board. Access is gained by removin

5 WARNING IMPORTANT SAFETY INSTRUCTIONS The user of electrical products must be familiar with their potential dangers, and

6 POWERING The mixer may be powered from either internal cells or an external DC power source. The integral battery compartment requires a total o

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8 TECHNICAL SPECIFICATION - ELECTRICAL REFERENCE 0dB=775mV at 1kHz unless otherwise stated. MAX GAIN MIC 80dB LINE 50dB MA