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Audio Developments AD 245, Manual, Page: 13 / 26

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Audio Developments AD 245 Manual Download Page 13

12

BLOCK DIAGRAM

Summary of Contents for AD 245

Page 1: ...ETY INSTRUCTIONS 5 POWERING 6 TECHNICAL SPECIFICATION 8 EQUALISATION CURVES 11 BLOCK DIAGRAM 12 CONNECTOR PANEL 13 CONNECTIONS 14 INPUT MODULE 16 OUTPUT MODULE 18 ADJUSTMENTS AND CALIBRATIONS 21 AD100...

Page 2: ...c line module is included for commentary or voice over purposes its input gain switch can be changed to a potentiometer and its gain structure changed to ensure consistent level matching with a fixed...

Page 3: ...te the 140 series We d reckoned however without the persistence nay insistence of our customers for a mains operated version of the AD146 with four auxiliaries we ve called it AD144 Radical change and...

Page 4: ...Temperature check the meter glasses for condensation If the package has been in transit during cold weather leave the mixer for at least 12 hours to allow it to return to normal room temperature Any m...

Page 5: ...ected to the module Module fix screws Hexagon head screws are used to fix the modules and back cover The size being 1 5mm HEX A F with a 2 5M thread If it becomes necessary to remove modules or back c...

Page 6: ...ly unit that is connected to the mains supply to drive the mixer it must be CONNECTED TO EARTH In certain types of malfunction or breakdown earthing provides a path of least resistance for electric cu...

Page 7: ...rnal power source PIN 1 is the 0v connection and a voltage in the range 12v to 15v DC should be supplied to PIN 4 The power source should be capable of delivering approximately 400mA allowing some cap...

Page 8: ...7 THIS PAGE IS BLANK...

Page 9: ...DER MAX OUTPUT 23dBm L R TRANSFORMER BAL 600R LOAD MONO TRANSFORMER BAL 18dBm H PHONE MONITOR UNBAL 600R LOAD TB SEND UNBAL OUTPUT IMPEDANCE 60R L R MONO 20R MONITOR 20R TB SEND FREQUENCY RESPONSE 0 1...

Page 10: ...TRANSFORMER 12dB OCTAVE 3dB 150Hz 3dB 90Hz OUTPUT LIMITER THRESHOLD 8dB RATIO 7 1 ATTACK 2 SETTINGS INTERNALLY SWITCHABLE 1 4mS 2 0 8mS RELEASE 2 SETTINGS INTERNALLY SWITCHABLE 1 250mS 2 80mS FACTORY...

Page 11: ...AL 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 ALL DIMENSIONS IN MILLIMETRES WEIGHT 6 I P 8 I P 10 I P 12 I P 6 7 8 9 ALL WEIGHTS IN KILOGRAMS EQUALISAT...

Page 12: ...11 AD 245 HIGH AND LOW EQ 20 15 10 5 0 5 10 15 20 10 100 1000 10000 100000 FREQUENCY dB AD 245 MID EQ AND HPF 20 15 10 5 0 5 10 15 20 10 100 1000 10000 100000 FREQUENCY dB...

Page 13: ...12 BLOCK DIAGRAM...

Page 14: ...o output XLRs L R 3 Mic Line input XLRs 4 Headphone monitor jack 5 External DC power input 6 Off On switch internal and external 7 Stereo return jacks L R and calibration preset 8 Subsidiary connector...

Page 15: ...O UNBALANCED JACK Tip Signal Tip Left signal Ring Signal Ring Right signal Sleeve Shield Sleeve Shield The 6 pin XLR connector SUB 8 carries all signals to and from an outstation Reverse talkback leve...

Page 16: ...ts either internal batteries or an external DC source Power to the mixer is confirmed by the MIX ON LED on the output module The LED flashes when the internal voltage falls below the safe operating le...

Page 17: ...e input 3 Input gain control 4 Phase change 5 High pass filter 6 EQ Selector 7 Panoramic potentiometer 8 Pre fade listen 9 PFL indicator LED 10 Overload indicator 11 High frequency control 12 Mid freq...

Page 18: ...r The input gain of the microphone amplifier is set by the 6 position switch 3 The range of this control is 50dB in 10dB steps For line level signals an input attenuator is inserted via switch 2 Follo...

Page 19: ...R or MON to meters 8 Line up tone 9 1kHz or 10kHz line up tone 10 Limiter link 11 Limiter LEDs 12 Output limiters 13 Direct or Return to HP 14 Left only 15 Right only 16 Monitor output level 17 Mono o...

Page 20: ...tput Battery status is read on the upper meter by BATT 5 and the meters may be illuminated by ILL 6 overuse of this function will rapidly drain the batteries When the internal voltage drops below a sa...

Page 21: ...output is in the L R domain the matrix will enable mono compatibility to be assessed on the left earpiece and out of phase components to be checked on the right earpiece When working entirely in the M...

Page 22: ...volts is at 0VU On a PPM meter it is indicated by a separate marking yellow on a BBC scale and red on an N10 and SDR scale VU meter there is one preset on the VU meter PCB for meter adjustment Set an...

Page 23: ...r reading at 18 Repeat this procedure to obtain an accurate reading at each of these three points Now check the calibration of all meter points SDR scale with a main output signal level of 6dBu adjust...

Page 24: ...t signal to just greater than 8dBu with the limiter deselected Introduce the limiter and adjust VR4 until the output signal falls to 8dBu This is the THRESHOLD setting If a different threshold setting...

Page 25: ...tted in an AD140 series mixer they may be recharged in situ from AD100 09 power supply whether the mixer is in use or not Maximum current is set at 250mA in addition to the 500mA of current supplying...

Page 26: ...25 TECHNICAL LIBRARY...

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