Studer-980-Service-Manual-Section-4电路原理图.pdf

Professional Audio System Components Date printed: 11.12.2006 Loudspeaker Amplifier 1.914.505 This low-power amplifier on a modular sub-card is designed to drive a 10.15 speaker. Power output is about 2.3 W. As can be concluded from this specification, the amplifier is not intended for high-quality moni- toring. It will be ideally suited, however, for pre-fader listening and similar applications. The amplifiers input is balanced and floating, with adjustable gain. Technical Specifications Input impedance 10 k , balanced and floating (with transformer) Nominal power output 2 W into 15 Power output 25 mW.2.5 W into 15 , with 0 dBu input Distortion < 0.5% at 2 W 1 k , for microphones with an impedance of 200 or less. Max. input level 2 dBu (615 mVrms); THD at 30 Hz: approx. 1% Common mode rejection 60 dB, unbalanced, to ground Output: Max. level +20 dBu (7.75 Vrms) Nominal level 0 dBu (0.775 Vrms) Impedance 33 (pin1) 3.3 k (pin2; to a 0- amp.) Minimum load 600 Max. gain 71 dB (see level diagram) Frequency response 0.5 dB, 30 Hz.16 kHz THD < 0.3%, 30 Hz.16 kHz at 20 dB gain Noise figure, linear < 4.5 dB, input terminated with 200 Supply: 15 V (11 mA idling) +48 V (1.914.506, only if phantom powering required) Dimensions: MS-card, 34 85 mm Ordering Information: Microphone pre-amplifier for dynamic microphones 1.914.506.xx Microphone pre-amplifier for electret microphones 1.914.507.xx Professional Audio System Components Date printed: 12.12.2006 VCA with Electronically Balanced Connections 1.914.515 In contrast to the VCA module 1.914.518/528, this assembly features elec- tronically balanced input and output. It is intended for use in balanced audio systems for 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 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 controlled simultaneously. Two control inputs provide VCA gain control from two different remote points Professional Audio System Components Date printed: 11.12.2006 Technical Specifications Input: Impedance 10 k , electronically balanced Clipping point +24 dBu Output: Electronically balanced Recommended load 2 k Maximum level +24 dBu Frequency response 0.5 dB, 30 Hz.15 kHz Gain/attenuation range +40.100 dB, with ext. control Control input: pin1; gain tracking 0 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 tracking 10 dB/V THD 3 k Clipping point +20 dBu Output: Impedance 33 or 3.3 k , selectable Max. level +20 dBu Recommended load 2 k Frequency response 0.5 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 noise 102 dBu Supply: 15 V (40 mA) Dimensions: MS-card, 34 85 mm Ordering Information: Voltage controlled amplifier with 1 control port 1.914.518.xx Voltage controlled amplifier with 3 control ports 1.914.528.xx Professional Audio System Components Date printed: 11.12.2006 Limiter Voltage Processor 1.914.519 Together with 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 release 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, amplifica- tion will recover only slowly. For stereo applications, a two-channel set-up (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 termi- nal, will effect the necessary gain reduction so that a limiting characteristic is obtained. The limiting threshold is adjustable in a wide range. Remote on/off switching of the limiter function is possible. Professional Audio System Components Date printed: 11.12.2006 Technical Specifications Limiter: Input impedance 10 k Max. input level +20 dBu Frequency range 30 Hz.16 kHz Output voltage 0.13 VDC Threshold level 15 dBu.+15 dBu Attack time 1 ms Release time 50 ms.5 s, program-depending Compression ratio 20:1, in conjunction with a VCA Supply: 15 V (10 mA) Dimensions: MS-card, 34 85 mm Ordering Information: Limiter voltage processor 1.914.519.xx Professional Audio System Components Date printed: 11.12.2006 1900 Hz Signal Generator 1.914.520 This signal generator produces a stable frequency of 1900 Hz to establish communication on outside broadcast lines, as specified in the EBU/CCIR recommendations. Technical Specifications Frequency 1900 Hz (adjustable) Distortion < 1% Output level 15.+6 dBu (adjustable) Output balanced and floating Output Impedance, out 1 20 k Frequency 20.60 Hz Min. level 17 Vrms Nominal level 70 Vrms Supply: +15 V (5 mA); 15 V (10 mA); 6 V (2 mA) Dimensions: MS-card, 34 85 mm Ordering Information: Call decoder 20.60 Hz 1.914.521.xx Professional Audio System Components Date printed: 11.12.2006 Call Decoder 1900 Hz 1.914.522 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 switched 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 Specifications Input: balanced, floating; no DC Frequency 1900 Hz, 1% Impedance 10 k Min. level 30 dBu Nominal level +24 dBu Supply: +15 V (5 mA); 15 V (10 mA); 6 V (2 mA) Insulation rating 500 VDC Dimensions: MS-card, 34 85 mm Ordering Information: Call decoder 1900 Hz 1.914.522.xx Part No.Qty.Type/Val.DescriptionPos.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 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, DO-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 154.01.027313pStecker 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, 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%, 02070 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 11.022.218.001 : 1EINGANGSTRAFO 1 : 10 End of List Comments: (01) IC3, R16, R19 changed Date printed: 06.11.2006 Professional Audio System Components Date printed: 11.12.2006 Relay Sub-Cards 1.914.523/524/525/526 Audio signal routing or enabling/disabling of certain circuit sections is often effected 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. 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 click produced by the relays armature is objectionable, a low-noise type is available. No. Coil Contact Rating 1.914.523 6 VDC / 137 220 V / 2 A / 60 W 1.914.524 24 VDC / 2.0 k 220 V / 2 A / 60 W * 1.914.525 5 VDC / 135 100 V / 0.5 A / 30 W (R1 = 27 for 6 V operation) * 1.914.526 24 VDC / 2.6 k 100 V / 0.5 A / 30 W (R1 = 0 ) * Low-noise relays Dimensions: MS-card, 34 85 mm Ordering Information: MSC relay 6 VDC 1.914.523.xx MSC relay 24 VDC 1.914.524.xx MSC relay 6 VDC; low-noise 1.914.525.xx MSC relay 24 VDC; low-noise 1.914.526.xx Professional Audio System Components Date printed: 11.12.2006 Breadboarding Card 1.914.529 This experimental board is an empty plug-in PCB compatible with the MSC system. It offers a punched 0.1” grid (2.54 2.54 mm) for individual component placement. Ordering Information: Breadboarding card 1.914.529.xx Professional Audio System Components Date printed: 11.12.2006 0- Input Amplifier with PFL Facility 1.914.530 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 between the in- dividual inputs. When using 3.3 k 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. Additional outputs for monitoring (or pre-listening) can be ac- tivated via solid-state switches by remote control. Technical Specifications Input: Max. current 2.5 mArms for max. output swing Current for 0 dBu 234.2 A; 0 dBu output (? 3.3 k at the input for unity gain) Output: Impedance 33 Max. output swing +20 dBu Load 600 max. output swing Frequency response 0.3 dBu, 30 Hz.16 kHz THD < 75 dB, 30 Hz.16 kHz Noise voltage at the output 110 dBu, input terminated with 3.3 k, bandwidth 23 kHz Noise figure, 12 inputs F 10 k Max. level +26 dBu CMRR 110 dB 50 Hz 110 dB 16 kHz Output: Unbalanced Impedance 33 Load 600 max. output swing Max. output swing +20 dBu Gain 1.4.17.8 dB Frequency response 0.3 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 PFL 1.914.531.xx Professional Audio System Components Date printed: 11.12.2006 Flip-flop Unit 1.914.532 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 will deactivate it again. Technical Specifications Input: floating, with opto-coupler Relay contacts: Max. rating 100 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 unit 1.914.532.xx Professional Audio System Components Date printed: 11.12.2006 90 Filter 1.914.533 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 em- phasis of the center information. By 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 filters 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 in- puts (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 level. 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 amplifiers. 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: 11.12.2006 Technical Specifications Input: Max. level +20 dBu Impedance 4 k Output: Max. level +20 dBu Impedance 6.8 k Frequency response 30 Hz.16 kHz, 0.3 dB Phase 90 3; 30 Hz.16 kHz THD 80 dB Noise 1 k , balanced, floating Max. level 2 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 Impedance 33 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