Studer-970-Service-Manual-Section-3电路原理图.pdf

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1、Professional Audio System Components Date printed: 29.11.01E13 2.1.7 VCA with Electronically Balanced Connections1.914.515 In contrast to the VCA 1.914.518/528 (chapter 2.1.8), this assembly fea- tures an electronically balanced input and output. It is intended for use in balanced audio systems for

2、a variety of applica- tions, especially when gain is to be controlled from a remote point. It will be useful in audio-video post-production work where suitable DC ramps can control cross-fades, voice-overs, etc. Its high overload margin and its exceptionally low noise and distortion performance make

3、 it the perfect choice for high-quality audio applications. By connecting the gain control terminals of a number of VCAs to a com- mon potentiometer or fader, several audio channels may thus be con- trolled simultaneously. Two control inputs provide VCA gain control from two different remote points

4、RadioFans.CN 收音机爱 好者资料库 Professional Audio System Components E14Date printed: 29.11.01 Technical Specifications Input: Impedance 10 k, electronically balanced Clipping point+24 dBu Output:Electronically balanced Recommended load 2 k Maximum level+24 dBu Frequency response0.5 dB, 30 Hz.15 kHz Gain/at

5、tenuation range+40.100 dB, with ext. control Control input: pin1; gain tracking0 V = unity gain; 1 dB/A; jumper 1-2 20 dB/V; jumper 2-3 10 dB/V; jumper 3-4 Control input: pin10; gain tracking10 dB/V THD 3 k Clipping point +20 dBu Output:Impedance 33 or 3.3 k, selectable Max. level+20 dBu Recommended

6、 load 2 k Frequency response0.5 dB, 30 Hz.16 kHz External gain control +40.90 dB (1.914.518.xx) +40.100 dB (1.914.528.xx) Gain/attenuation range (pot. meter)+40.60 dB / +10.70 dB / +10.90 dB (1.914.518.xx only, jumper- selectable) Gain tracking 10 dB/V THD 0.1% Equivalent input noise102 dBu Supply:1

7、5 V (40 mA) Dimensions:MS-card, 34 85 mm Ordering Information:Voltage controlled amplifier with 1 control port1.914.518.xx Voltage controlled amplifier with 3 control ports1.914.528.xx Professional Audio System Components Date printed: 29.11.01E17 2.1.9 Limiter Voltage Processor1.914.519 Together wi

8、th this voltage processor, the VCAs 1.914.518/528 can perform as signal level limiters. The processors threshold can be set within a wide range of levels, so that limiting action becomes effective at a desired level within a range of 15 to +15 dBu. Limiting action attacks within 1 ms, whereas releas

9、e can vary from 50 ms to 5 s, depending on the programs energy content. This means that no audible “pumping” action which is often associated with such a device will occur. After the cessation of loud passages, amplifi- cation will recover only slowly. For stereo applications, a two-channel set- up

10、(VCAs and voltage processor) can be linked, so that identical amounts of gain reduction will take place simultaneously in both channels. The input of the voltage processor has to be wired to the output of the VCA. The processors output, when connected to the VCAs control ter- minal, will effect the

11、necessary gain reduction so that a limiting character- istic is obtained. The limiting threshold is adjustable in a wide range. Re- mote on/off switching of the limiter function is possible. Professional Audio System Components E18Date printed: 29.11.01 Technical Specifications Limiter:Input impedan

12、ce 10 k Max. input level+20 dBu Frequency range30 Hz.16 kHz Output voltage 0.13 VDC Threshold level15 dBu.+15 dBu Attack time1 ms Release time50 ms.5 s, program-depending Compression ratio20:1, in conjunction with a VCA Supply:15 V (10 mA) Dimensions:MS-card, 34 85 mm Ordering Information:Limiter vo

13、ltage processor1.914.519.xx Professional Audio System Components Date printed: 29.11.01E19 2.1.10 1900 Hz Signal Generator1.914.520 This signal generator produces a stable frequency of 1900 Hz to establish communication on outside broadcast lines, as specified in the EBU/CCIR recommendations. Techni

14、cal Specifications Frequency1900 Hz (adjustable) Distortion 1% Output level15.+6 dBu (adjustable) Output balanced and floating Output Impedance, out 1 20 k Frequency20.60 Hz Min. level17 Vrms Nominal level70 Vrms Supply:+15 V (5 mA); 15 V (10 mA); 6 V (2 mA) Dimensions:MS-card, 34 85 mm Ordering Inf

15、ormation:Call decoder 20.60 Hz1.914.521.xx Professional Audio System Components Date printed: 29.11.01E21 2.1.12 Call Decoder 1900 Hz1.914.522 This card contains a call receiver for the standardized 1900 Hz call fre- quency on OB lines. It is tuned to respond to 1900 Hz 1 %. The receiver can be swit

16、ched either to activate an optical or an acoustical signal for the duration of the 1900 Hz call (linked mode), or the acoustical signal can be selected to remain activated until reset (normal mode). The acoustical signal can be generated by an external buzzer (not sup- plied). Technical Specificatio

17、ns Input: balanced, floating; no DC Frequency1900 Hz, 1% Impedance 10 k Min. level30 dBu Nominal level+24 dBu Supply:+15 V (5 mA); 15 V (10 mA); 6 V (2 mA) Insulation rating500 VDC Dimensions:MS-card, 34 85 mm Ordering Information:Call decoder 1900 Hz1.914.522.xx Part No.Qty.Type/Val.DescriptionPos.

18、Idx.Part No.Qty.Type/Val.DescriptionPos.Idx. Studer Audio Components Page: 1 of 1 Call Decoder 1900 Hz 1.914.522.00 ( 1) C 259.06.01021n0PETP, 63V, 10%, RM50 C 359.06.01021n0PETP, 63V, 10%, RM50 C 459.06.02222n2PETP, 63V, 10%, RM50 C 559.05.24724n7PP, 2.5%, 63V0 C 659.34.4121120pCER 63V, 5%, N7500 C

19、 759.06.010310nPETP, 63V, 10%, RM50 C 859.26.52292u2SAL, 20%, 25V0 C 959.06.0224220nPETP, 63V, 10%, RM50 C 1059.06.5474470nPETP, 63V, 5%, RM50 C 1159.26.26896u8SAL 16V 20%0 C 1259.26.26896u8SAL 16V 20%0 C 1359.26.26896u8SAL 16V 20%0 C 1459.26.26896u8SAL 16V 20%0 D 350.04.01251N444875V, 150mA, 4ns, D

20、O-350 D 450.04.01251N444875V, 150mA, 4ns, DO-350 D 550.04.01251N444875V, 150mA, 4ns, DO-350 D 650.04.01251N444875V, 150mA, 4ns, DO-350 D 750.04.111712VZener, 5%, 0.5W, DO-350 IC 150.09.0101TL072Dual op-amp biFET0 IC 250.07.0032FX101IC FX-101 L, ,A0 IC 350.07.10114011Quad 2-inp NAND1 P 154.01.027313p

21、Stecker CIS parallelsteck0 Q 150.03.0515BC307BPNP 100mA 45V0 Q 250.03.0436BC237BNPN 100mA 45V0 R 157.11.35625k6MF, 1%, 02070 R 257.11.35625k6MF, 1%, 02070 R 357.11.312312kMF, 1%, 02070 R 457.11.3104100kMF, 1%, 02070 R 557.11.33923k9MF, 1%, 02070 R 757.11.51551M5MF, 5%, 02070 R 858.01.820320kCermet,

22、10%, 0.5W, horizontal0 R 957.11.3154150kMF, 1%, 02070 R 1057.11.3104100kMF, 1%, 02070 R 1157.11.3104100kMF, 1%, 02070 R 1257.11.310310kMF, 1%, 02070 R 1357.11.310310kMF, 1%, 02070 R 1457.11.52252M2MF, 5%, 02070 R 1557.11.3104100kMF, 1%, 02070 R 1657.11.52252M2MF, 5%, 02071 R 1757.11.31051M0MF, 1%, 0

23、2070 R 1857.11.3104100kMF, 1%, 02070 R 1957.11.52252M2MF, 5%, 02071 R 2057.11.31051M0MF, 1%, 02070 R 2157.11.3104100kMF, 1%, 02070 R 2257.11.322022RMF, 1%, 02070 R 2357.99.020650RPTC, 25V, 0.5W0 R 2457.99.020650RPTC, 25V, 0.5W0 R 2557.99.020650RPTC, 25V, 0.5W0 R 2657.11.3391390RMF, 1%, 02070 T 11.02

24、2.218.001 : 1EINGANGSTRAFO 1 : 10 End of List Comments: (01) IC3, R16, R19 changed Date printed: 06.11.2006 Professional Audio System Components E22Date printed: 29.11.01 2.1.13 Relay Sub-Cards1.914.523/524/525/526 Audio signal routing or enabling/disabling of certain circuit sections is often effec

25、ted best using relays. The Modular Sub-Card System, therefore, offers a selection of four relays on individual circuit boards. Because only one relay can be accommodated on one MS-Card, several cards (or a card from the Euro-card range) will be required if more complex switching has to be realized.

26、The relays offer double pole/double throw switching with non-shorting contacts, and coils rated for either 6 VDC or 24 VDC operation. A diode is wired across the relay coil in all versions to suppress interfering back- EMF when de-energizing the relay. For studio applications where the mechanical cl

27、ick produced by the re- lays armature is objectionable, a low-noise type is available. No.CoilContact Rating 1.914.5236 VDC / 137 220 V / 2 A / 60 W 1.914.52424 VDC / 2.0 k220 V / 2 A / 60 W * 1.914.5255 VDC / 135 100 V / 0.5 A / 30 W (R1 = 27 for 6 V operation) * 1.914.52624 VDC / 2.6 k100 V / 0.5

28、A / 30 W (R1 = 0 ) * Low-noise relays Dimensions:MS-card, 34 85 mm Ordering Information:MSC relay 6 VDC1.914.523.xx MSC relay 24 VDC1.914.524.xx MSC relay 6 VDC; low-noise1.914.525.xx MSC relay 24 VDC; low-noise1.914.526.xx Professional Audio System Components Date printed: 29.11.01E23 2.1.14 0- Inp

29、ut Amplifier with PFL Facility1.914.530 This amplifier with its characteristic input impedance of less than 1 finds its application as a summing amplifier. A multitude of unbalanced sources can thus be mixed with a high degree of effective isolation be- tween the individual inputs. When using 3.3 k

30、resistors as combining (mixing) resistors in series with each source feeding the summing bus, gain will be unity (0 dB), i.e., the amplifiers output level will be equal to the level of the signal source ahead of the combining resistor. The amplifiers output is unbalanced, with low impedance. Additio

31、nal outputs for monitoring (or pre-listening) can be activated via solid-state switches by remote control. Technical Specifications Input:Max. current2.5 mArms for max. output swing Current for 0 dBu234.2 A; 0 dBu output (? 3.3 k at the input for unity gain) Output:Impedance33 Max. output swing+20 d

32、Bu Load 600 max. output swing Frequency response0.3 dBu, 30 Hz.16 kHz THD 75 dB, 30 Hz.16 kHz Noise voltage at the output110 dBu, input terminated with 3.3 k, bandwidth 23 kHz Noise figure, 12 inputsF 10 k Max. level+26 dBu CMRR 110 dB 50 Hz 110 dB 16 kHz Output:Unbalanced Impedance33 Load 600 max.

33、output swing Max. output swing+20 dBu Gain1.4.17.8 dB Frequency response0.3 dB, 30 Hz.16 kHz THD 85 dB, 30 Hz.16 kHz Noise voltage 107 dBu, gain 6 dB, bandwidth 23 kHz Supply:15 V (10 mA idling) Dimensions:MS-card, 34 85 mm Ordering Information:HL input with PFL1.914.531.xx Professional Audio System

34、 Components Date printed: 29.11.01E25 2.1.16 Flip-flop Unit1.914.532 The Flip-flop Unit consists of a relay with two DPDT contacts and a flip- flop circuit with a control input (opto-coupler). A ground pulse from a non-latching switch applied to the input activates the relay. A next ground pulse wil

35、l deactivate it again. Technical Specifications Input:floating, with opto-coupler Relay contacts:Max. rating100 V/0.5 A/30 W Supply:6 V for logic 24 V for opto-coupler Dimensions:MS-card, 34 85 mm Ordering Information:Flip-flop unit1.914.532.xx Professional Audio System Components E26Date printed: 2

36、9.11.01 2.1.17 90 Filter1.914.533 This active 90 filter is used to form a monophonic signal from the left and right channel of stereo signals. Simple mixing of the left and right channel will not produce a mono signal of satisfactory quality, but results in an emphasis of the center information. By

37、summing the stereo signals in a 90 phase-shifted manner, this undesirable effect can be avoided. The 90 filter consists of two all-pass filter chains, producing a uniform 90 phase difference across the whole audio range. The left and the right stereo signals are each passed through one of these filt

38、ers and added at the filters output. Doubling of equally-phased signal components as well as canceling of opposite-phased components is thus avoided. The filter circuits are of unbalanced configuration. For this reason a sum- ming circuit usually consists of two high-level amplifiers with balanced i

39、nputs (1.914.502), one 90 filter, and one high-level output amplifier (1.914.501), all accommodated on one MSC motherboard, as shown in the diagram above. The gain of this combination can be adjusted. A correlated stereo input of equal level in both channels will provide a mono signal of identical l

40、evel. With only one input channel (left or right), the mono output level will be lower by 3 dB. Since the 90 filter with its input and output cards can be realized on a single, Euro-card size MSC motherboard, it can possibly be combined with other Audio Components, such as limiters and isolation amp

41、lifiers. Such stereo-to-mono combinations are in use at various radio stations to feed the stereo programs to the monophonic AM-transmitter in a correctly summed manner. Professional Audio System Components Date printed: 29.11.01E27 Technical Specifications Input:Max. level+20 dBu Impedance4 k Outpu

42、t:Max. level+20 dBu Impedance6.8 k Frequency response30 Hz.16 kHz, 0.3 dB Phase90 3; 30 Hz.16 kHz THD 80 dB Noise 1 k, balanced, floating Max. level2 dBu (THD at 30 Hz 1%) +19 dBu, pad on Pad (attenuation)21 dB, jumper-selectable CMRR 60 dB 16 kHz Source impedance 200 Output: Max. level+20 dBu Imped

43、ance33 Load 2 k Gain adjust (v1)min. +10 dB, VCA = 0 dB; pad off max. +37 dB, VCA = 0 dB; pad off min. 11 dB, VCA = 0 dB; pad on max. +16 dB, VCA = 0 dB; pad on Gain control characteristics (v2)10 dB/V DC range10.+6 V, pin3: gain control input Total gainvtot = v1 + v2 Max. attenuation 90 dB General:

44、Frequency response0.5 dB, 30 Hz.16 kHz THD 50 dB, 20 dB gain; 30 Hz.16 kHz Noise voltage95 dBu, pad on; 0 dB gain Noise figureF 10 dB, bandwidth = 23 kHz; 60 dB gain; Rs = 200 ; pad off Limiter:Threshold level7.+20 dBu Attack time0.5 ms Release time50 ms.1 s, program-dependent Compression ratio10:1

45、1 kHz Supply:15 V (25 mA) Ordering Information:Microphone amplifier with limiter1.914.539.xx Professional Audio System Components Date printed: 29.11.01E31 2.1.20 Dual Fader/VCA Control Voltage Interface1.914.540 /541 These interfaces are used to convert the voltage of a linear fader to the non-line

46、ar dB scale of a Studer VCA. One card processes two channels. It is available in two versions: 540.xx (0.+10 VDC control voltage), and 541.xx (+5.0 VDC control voltage). A regulated +10 VDC reference voltage is generated on-board. The DC from the faders wiper is connected to the input. Offset and sc

47、ale alignment is performed with on-board trimmer potentiometers for matching the VCA gain to the dB scale of the fader. Technical Specifications 1.914.540.xx1.914.541.xx Input:Impedance 1 M, unbalanced100 k, unbalanced Level range0.+10 V+5.0 V Output:Impedance33 , unbalanced33 , unbalanced Control r

48、ange+1 V.10 V+1 V.10 V Supply:15 V (15 mA) Dimensions:MS-card, 34 85 mm Ordering Information:Fader/VCA control interface1.914.540.xx Fader/VCA control interface1.914.541.xx Part No.Qty.Type/Val.DescriptionPos.Idx.Part No.Qty.Type/Val.DescriptionPos.Idx. Studer Audio Components Page: 1 of 1 Dual Fade

49、r/VCA Control Voltage IF 1.914.541.00 ( 0) C 159.60.332510nCER 50V, 10%, X7R, 080501 pce C 259.60.2249100pCER 50V, 5%, C0G, 060301 pce C 359.60.23731n0CER 50V, 5%, C0G, 080501 pce C 459.60.3337100nCER 50V, 10%, X7R, 080501 pce C 559.60.3337100nCER 50V, 10%, X7R, 080501 pce C 659.60.2249100pCER 50V, 5%, C0G, 060301 pce C 759.68.006510uEL 16V, 4.0*5.701 pce C 859.60.23731n0CER 50V, 5%, C0G, 080501 p