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Total Audio Control COMPRESSOR ONE 500 Series, Инструкция по сборке и эксплуатации

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39 

 
 
13) Measure the signal at TP4 against input signal level. This is the output from the RMS converter. 

INPUT SIGNAL (dBu) 

TP4 (measured) 

 

 

NO SIGNAL 

-460 

-60 

-309 

-50 

-236 

-40 

-170 

-30 

-106 

-20 

-43.7 

-10 

+18.9 

0 

+81.9 

+10 

+145.5 

+20 

+212.1 

 

14) TP6 is the output from the THRESHOLD control. The control voltage is approx. -127.45mV/dB.  Therefore, to achieve 30dB 
limiting with a +20dBu input signal this would need in a control voltage of 50 x 127.45 = 6.372V. 
Set the input signal to +20dBu. Set the THRESHOLD CONTROL to -30dB (fully CCW). Adjust the -30 trimmer (VR1) until TP6 reads 
-6.372V. This will be approximately 12 o’clock. 

 

INPUT SIGNAL (dBu) 

TP6 (measured) 

 

 

-60 

+4.55mV 

-50 

+4.53mV 

-40 

+4.53mV 

-30 

-130.7mV 

-20 

-1.346V 

-10 

-2.578V 

0 

-3.814V 

+10 

-5.067V 

+20 

-6.372V 

 

Next confirm that similar readings to those on TP6 are obtained on TP5 and TP29. 
 

Содержание COMPRESSOR ONE 500 Series

Страница 1: ...ASSEMBLY USER MANUAL 500 Series Suite 5 Fairfield 1048 Govan Road Glasgow G51 4XS United Kingdom info totalaudiocontrol com www totalaudiocontrol com...

Страница 2: ...ly well performing digital multimeter with semiconductor testing capability or a capacitance meter can be picked up from e bay for the cost of literally a burger meal Therefore investing into a few ha...

Страница 3: ...ld be able to get in and out of a solder node within few seconds Safety first be extremely careful when trimming component leads as these can easily fly off into your face Always hold the lead with on...

Страница 4: ...4 BLOCK DIAGRAM...

Страница 5: ...d by jumpers Optional Sidechain and Dry path insert points Hard Soft switch Feed forward Feedback switch L switch providing Sidechain Listen facility or multichannel linking Master LED illuminated whe...

Страница 6: ...level 6dB This is also the level at unbalanced insert points 6 IMPEDANCES Input impedance balanced 24k ohms Output impedance balanced 75 ohms Unbalanced SIDECHAIN insert input impedance 50k ohms Unbal...

Страница 7: ...7 ASSEMBLY...

Страница 8: ...8 LDO66 MAIN BOARD...

Страница 9: ...9 LDO66 MAIN BOARD WITH COMPONENT VALUES...

Страница 10: ...RD ASSEMBLY Solder the 3 pin right angle header to the LD046 card The plastic spacer should butt up against the PCB and the header should sit well aligned Solder the potentiometer Also make sure that...

Страница 11: ...11...

Страница 12: ...12...

Страница 13: ...13...

Страница 14: ...14...

Страница 15: ...15...

Страница 16: ...16 Fit the Left Hand Side screen plate...

Страница 17: ...17 LDO67 SWITCH SUB BOARD...

Страница 18: ...18 LDO67 SWITCH SUB BOARD WITH COMPONENT VALUES...

Страница 19: ...19...

Страница 20: ...20 LD068 GR METER and LD069 AUDIO METER CARD ASSEMBLIES...

Страница 21: ...21...

Страница 22: ...22...

Страница 23: ...6 and P17 2 way pin headers Slide off the plastic spacers These to be interference fit for chassis connection 2 Solder the middle switch first and then the other two switches Trim the excess pins 3 So...

Страница 24: ...24...

Страница 25: ...25...

Страница 26: ...26...

Страница 27: ...27...

Страница 28: ...28 Fit jumpers to SUB1 1 2 3 4 6 7 8 9 and P5 J8 as shown above Jumper positions are also shown on the silk screen DO NOT FIT ANY OTHER JUMPERS UNTIL INSTRUCTED OTHERWISE...

Страница 29: ...29 FRONT PANEL CONTROLS...

Страница 30: ...lso active in A1 or A2 Recovery mode Toggle switch in R position potentiometer control of 75mS to 3S A1 50ms 5S A2 100mS 2S Provides control of 0 to Limit 10 1 Provides make up gain of 6dB to 18dB Pro...

Страница 31: ...off of 6dB octave Slope and turnover points are nominal THE DEFAULT SETTING IS WITH THE JUMPER ACROSS PINS 1 2 F2 applies a band pass filter which focuses the compressor s detection circuit entirely...

Страница 32: ...STEN In LISTEN mode when the compressor is switched IN the L switch replaces the normal main output with the audio signal present at the input to the RMS detector This allows monitoring of the sidecha...

Страница 33: ...33 TESTING SINGLE MONO MODULE WITH LISTEN DEFAULT OPERATION...

Страница 34: ...o shown below PLEASE NOTE P1 LINK JUMPER IS ONLY FITTED FOR MASTER SLAVE OPERATION AND ONLY WHEN USED ON TOTAL AUDIO CONTROL RACKS IT MUST NOT BE FITTED FOR ANY OTHER MODE OF OPERATION AND OR ON THIRD...

Страница 35: ...35...

Страница 36: ...e IN OUT switch set to OUT pass a 10dBu 1kHz signal The AUDIO meter should indicate 10dBu for INPUT or OUTPUT and there should be no reading when the source is selected to SIDECHAIN The GAIN REDUCTION...

Страница 37: ...AIN REDUCTION meter should illuminate 9 With an input of 0dB verify the GAIN MAKEUP calibrations when fully CCW and CW 6dB and 18dB Also verify the 0 point is correct Component tolerances may affect t...

Страница 38: ...14 V 15 8V 15 92V TP15 WET 0V 0 56mV TP16 DRY 0V 0 55mV TP17 VCA_OUT2 0V 1 72mV TP18 Audio Meter SIG PRESENT 77mV 79 6mV TP19 Audio Meter 0dB 540mV 544 1mV TP20 Audio Meter 18dBu 4 0V 4 0V TP21 GR Met...

Страница 39: ...127 45mV dB Therefore to achieve 30dB limiting with a 20dBu input signal this would need in a control voltage of 50 x 127 45 6 372V Set the input signal to 20dBu Set the THRESHOLD CONTROL to 30dB full...

Страница 40: ...immed values will drift in time Therefore you may wish to leave it untrimmed Alternatively you may wish to install the optional LD043 VCA card containing THAT 2180 VCA which does not require trimming...

Страница 41: ...asurements Hanning works great too although it is a compromise between dynamic range and frequency selectivity Hamming might hide too much of the sought after sideband frequencies 3rd octave mode does...

Страница 42: ...0dBu to the input of COMPRESSOR ONE Now adjust VR9 labelled SYM until the harmonics start to disappear If you adjust VR9 further they will start to appear back again Just make them disappear so that o...

Страница 43: ...oggle switches to left PIN EXPECTED NOMINAL VOLTS MEASURED U1 1 7 0 500mV 0 58mV 498mV U2 1 7 250mV 0 233mV 3 81mV U3 5 0 0 6mV U4 1 8 0 0 0 61mV 1 54mV U5 1 7 0 0 1 66mV 6 67mV U6 1 7 0 0 11 25mV 1 5...

Страница 44: ...ERT point Check all jumpers are correctly set and necessary connections are made Connect P4 pins 1 2 to bypass insert point 3 If TP29 does not track TP5 TP6 suspect Q1 Q1 improves the opamp drive capa...

Страница 45: ...45 MULTICHANNEL OPERATION...

Страница 46: ...r LINK two adjacent modules for multichannel operation or can function as a SIDECHAIN LISTEN switch There are four basic modes of operation Listen Norm Master and Slave In addition to these there are...

Страница 47: ...Forward Feed Back switch must be in the same position for ALL linked modules for correct operation Pressing the L switch connects the RMS detector capacitor to any other identical compressor using the...

Страница 48: ...V OFF 0 530 0 530 0 530 60 0 704 0 714 0 705 50 0 774 0 782 0 775 40 0 840 0 846 0 839 30 0 903 0 908 0 902 20 0 966 0 970 0 963 10 1 028 1 031 1 025 0 1 090 1 093 1 087 10 1 152 1 155 1 149 20 1 215...

Страница 49: ...bined control signal for all the THAT4301s in the system ONLY CONNECT ONE MODULE IN A GROUP AS A MASTER OTHERWISE DAMAGE WILL OCCUR 4 SLAVE This connects the RMS detector averaging circuit to any othe...

Страница 50: ...ividually controlled on each slave Multiple slaves may be set up In practice it is unlikely that more than 7 would be required ONLY CONNECT ONE MODULE IN A GROUP AS A MASTER OTHERWISE DAMAGE WILL OCCU...

Страница 51: ...ere are slight variations with frequency at the low end 1 234V at 10Hz and 1 24V at 20Hz The Master bus is the send from the master module appears on pin 6A as LINK_MASTER This only applies to TAC mot...

Страница 52: ...F this puts a low impedance on the bus and crosstalk onto it is not going to have adverse effects Similarly when the LINK_MASTER bus is in use it will always be sourced from a low impedance When neith...

Страница 53: ...bus system only the NORMAL NORM mode of COMPRESSOR ONE can be used for multichannel linking PIN 6 on the solder side left side of the COMPRESSOR ONE module corresponds to the API 500 rack specificati...

Страница 54: ...the MASTER bus must always be wired in the same manner by using J9 B and J10 B pins Do not twist these wires they may be loosely tied They do not need screening but should be kept as short as possible...

Страница 55: ...des the LINK_MS connection These backplane buses may additionally be linked by a rear panel LINK switch Viewed from the rear of the rack 3 way double pole toggle switch fitted Switch to the right No l...

Страница 56: ...56 SIDE CHAIN INSERT CONNECTIONS...

Страница 57: ...57 PIN 7 and PIN 9 on the edge connector are unbalanced RETURN and SEND respectively These are labelled as W2 and W3 on the card edge connection fingers...

Страница 58: ...e with COMPRESSOR ONE 3 FOR USE IN A TOTAL AUDIO CONTROL RACK WITH BALANCED INSERT POINTS Fit wire jumpers to W2 and W3 Total Audio Control rack will be fitted with LD050 Balancing Card 4 FOR USE IN A...

Страница 59: ...sert connections Again this type of connection is not compatible with COMPRESSOR ONE side chain insert points and will not work However it might be possible to achieve unbalanced connections Otherwise...

Страница 60: ...60 Insert connections to Total Audio Control INSERT ONE module...

Страница 61: ...P3 DRY PATH INSERT POINT P3 is fitted if no DRY PATH INSERT is available This connects the DRY PATH INSERT SEND to INSERT RETURN bypassing any external connection If there is any form of dry path ins...

Страница 62: ...62 OPTIONAL LD043 VCA CARD...

Страница 63: ...ntains the RMS detector Symmetry TRIM control VR9 to the VCA for distortion trimming will be disabled as it is no longer required Do not fit jumpers to P5 J8 Plug in the LD043 VCA card and secure it u...

Страница 64: ...64...

Страница 65: ...65 OPTIONAL LD047 HARD BYPASS CARD...

Страница 66: ...loading signal path loading is determined by the preceding and following devices which could result in a mismatch or clicks Audio metering of the signal path on the Compressor will not be displayed Sm...

Страница 67: ...67...

Страница 68: ...68 Total Audio Control...

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