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* * * * * * * * * IMPORTANT * * * * * * * * * *

Only replace IC2 with an op-amp which is slower

than the SSM2143 such as the TL072 used here. A
faster op-amp like the NE5532 will cause the output of
IC4 to oscillate.

* * * * * * * * * * * * * * * * * * * * * * * * * * * *

Signal from IC1b is fed through anti-alias filter R14

C8 and DC isolated by C11 before connecting to the
left input of the sigma delta analog to digital converter
IC7. The right channel connects to the converter via
similar circuitry.

The 12.288 MHZ master clock input to the ADC is

generated by a crystal oscillator located on the DSP
control card. Combined left and right audio data is
sent synchronously (data, clock, frame sync) to the
DSP in 64-bit strings via connector P3. The reset sig-
nal from the DSP control card is also connected to the
ADC. The DSP activates the reset once a day which
causes the ADC to perform a self calibration routine
for about half a second. If the meter has undergone a
substantial temperature change, it may generate
noise up to -70 dBFS until it undergoes a calibration
cycle

The three supply voltages from P3 are EMI isolated

by ferrite beads FR1,FR2 and FR3 before connecting
to the other circuitry. IC5 and IC6 supply low noise
reg/- 5 VDC to the analog portions of the cir-
cuit. The digital part of the data converter gets its +5
VDC from the DSP control card.

Page 10

** Bright-VU Instruction Manual **

Содержание BRIGHT-VU

Страница 1: ...l B r i g h t V U 3 5 3 0 2 5 2 0 1 5 1 0 7 5 3 2 1 0 1 2 3 6 9 1 2 1 5 3 5 3 0 2 5 2 0 1 5 1 0 7 5 3 2 1 0 1 2 3 6 9 1 2 1 5 1 8 1 8 3 5 3 0 2 5 2 0 1 5 1 0 7 5 3 2 1 0 1 2 3 6 9 1 2 1 5 3 5 3 0 2 5...

Страница 2: ...itek Electronic Systems Inc and is protected by United States copyright laws and international treaty provisions Logitek grants to you the right to use one copy of the embedded soft ware in each Brigh...

Страница 3: ...TRUCTIONS 3 1 Bargraph Description 6 3 2 Display Ballistics 6 3 3 Using Alignment Tones 6 3 4 User Maintenance 6 3 5 Resetting the Program 6 SECTION 4 SERVICING 4 1 General Information 7 4 2 Fuse 7 4...

Страница 4: ...ed Loop through 2200 Ohm balanced Termination transformer balanced Connector Female 3 pin XLR IN Male 3 pin XLR OUT AC Line Input Voltage 50 60 Hz 105 129 VAC or switch settable 220 240 VAC Power Requ...

Страница 5: ...ected via a slide switch located next to the power transformer in side the unit To gain access to the voltage select switch remove the enclosure top cover The switch is located adjacent to the large p...

Страница 6: ...iggered by several selectable fault conditions The relay contacts are brought out on the rear panel terminal block The alarm function is controlled by an eight position DIP switch located on the DSP c...

Страница 7: ...verage and peak value of a sine wave The size of the VU to PPM difference is a function of signal wave shape and the only signal that has the same VU and PPM reading is a square wave 3 4 User Maintena...

Страница 8: ...e risk of static electricity Store such circuits on conductive foam or in anti static containers Do NOT store on styrofoam or other plastic sheets Improper handling may damage these devices 4 4 Access...

Страница 9: ...nes are current controlled and con nected to the LED anodes Digit lines connect to the LED cathodes Scanning is accomplished by taking each digit line low one at a time and sourcing current from the s...

Страница 10: ...o data is sent synchronously data clock frame sync to the DSP in 64 bit strings via connector P3 The reset sig nal from the DSP control card is also connected to the ADC The DSP activates the reset on...

Страница 11: ...10 153 P3 3 pin large header locking PN MLSS156 3A P4 3 pin header PN MFSS100 3A P5 6 10 pin dual row header PN 051 010 153 4 pcs 10 pin dual row socket PN 050 010 455 1 pc 3 pin large socket PN CE156...

Страница 12: ...8 50K multi turn trim MP CT9X503 R9 10 300 1 pc Circuit card LG 271A Bright VU Analog Input 5 3 Digital Input Card Capacitors C1 047uf 50V CE CW 20C473K C2 4 1uf 50V SMD ceramic NC NMC1206Z5U104M50T...

Страница 13: ...ver MM MAX7219CWG Resistors R1 10K Switches SW1 Slide SPDT CK TS01 C K E 1 pc Circuit card LG 273A Bright VU Display 5 5 Power Supply Capacitors C1 6800uf 35V electrolytic IL 688LBA035M2CD C2 1uf 50V...

Страница 14: ...E103MATMA C23 1 uf 50V ceramic SMD NC NMC1206Z5U104M50T C24 25 470pf 100V ceramic SMD AV 12061A471JATMA C26 1 uf 50V Z5U SMD 1206 NC NMC1206Z5U104M50T Diodes D1 2 5 4V zener GI 1N4734A Integrated Circ...

Страница 15: ...le CA HP Hewlett Packard Opto electronics Div Santa Clara CA IL Illinois Capacitor Lincolnwood IL LF Littlefuse Des Plaines IL LG Logitek Circuit cards Houston TX LT Linear Technologies Milpitas CA MM...

Страница 16: ...SECTION 7 DIAGRAMS Page 16 Bright VU Instruction Manual...

Страница 17: ...Bright VU Instruction Manual Page 17...

Страница 18: ...Page 18 Bright VU Instruction Manual...

Страница 19: ...Bright VU Instruction Manual Page 19...

Страница 20: ...his order and Seller s obligation under this warranty shall be limited to such adjustment as Seller may obtain from the original manufacturer This limited warranty is void if equipment is modi fied or...

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