SRS Labs SR560 manual Power Regulators, Rear Panel Interfaces

Page 19

CIRCUIT DESCRIPTION

regulator that provides twice the current of the LM317 negative battery regulator.

Charging is controlled by changing the set voltage of the regulators based on battery charge status. Flip-flop U703 determines whether the charge regulators will be set to

15.5volts for a quick charge or 13.8 volts for a trickle or "maintain" charge by grounding the bottom of P701 and P702. C712 and R704 insure that the charger always powers up in the "quick" charge mode. P701 and P702 are provided to adjust the open circuit trickle charge voltage to 13.8 volts. D701 and D703 are blocking diodes for the charging circuits while not charging, and D707 and D708 are clamps to guard against battery polarity reversal.

Comparators U708 and U709 are LP365 micropower comparators that monitor the battery voltage. A resistive divider chain sets the four trip points for each comparator. D709 provides a stable 2.5 volt reference against which levels are compared. For each battery, three level indications are provided, and are decoded by multiplexer U704. The "trip" level is 14.5 volts. The trip outputs control the state of U703 and switch the battery charge voltage settings. The "low" level is 11.3 volts and activates the front panel low battery indicator. R730 provides some level hysteresis for the low battery indication to prevent oscillation around the trip point. The "dead" level is

10.7volts and is used to disconnect the load from the batteries before they are damaged by an excessively deep discharge. Q701 and Q703 are power MOSFET switches used to disconnect battery power from the amplifier. Dead level hysteresis is provided by R724. R731 and D711 provide un-interrupted battery power to the system RAM so that stored instrument settings are retained when the power is switched off.

POWER REGULATORS

The +5 V and +10 V supplies are produced with three-terminal regulators U801 and U802, respectively. The -10 V supply is constructed of op-amp U803 and Q801, a N-channel MOSFET as the pass element. The +10 V supply serves as the reference for the -10 V supply through divider R807 and R806.

The power output banana jacks on the rear panel (J801 and J803) are connected to the pre-regulated voltages after the power switch and before the regulators. This output can provide up to 200 mA of power for use as an external bias source, etc. Under some conditions, these jacks may be used to supply the unit with external DC power.

U506D and U506B generate the TTL level input to the processor to indicate when the unit is operating on the AC line.

Capacitors C801 through C821 are logic supply bypass capacitors distributed throughout the printed circuit board.

REAR PANEL INTERFACES

Two optically isolated rear panel interfaces are provided on the SR560. The blanking input accepts a TTL-level signal and grounds the amplifier signal path after the front end for as long as the input is held high. The response time of the blanking input is typically "on" 5 µs after the rising edge and "off" 10 µs after the falling edge. The RS-232 interface allows calibration and control of the instrument at 9600 baud. Data in and out on the connector are tied together, echoing data back to the sender. Hardware handshaking lines CTS, DSR, and CD are tied to DTR. Refer to Appendix A-1for information on remote programming of the SR560.

15

Page 18 Page 20
Image 19
Page 18 Page 20
Contents Model SR560 Page Table of Contents Appendix B PCB SR560 Revision F 9/89 SchematicsCalibration and Repair Appendix aInstrument Overview Introduction and SetupPreparation for USE Environmental Conditions Accessories FurnishedRepackaging for Shipment Use in Biomedical ApplicationsPage SR560 LOW-NOISE Preamplifier Specifications Chart SpecificationsSpecifications Source PowerOperation and Controls Front Panel Operating SummaryFilters Output Gain ModeReset GainRear Panel Operating Summary AC Power InputAmplifier Power Output Battery ChargerRS-232 Interface Battery Care and UsageBattery Care Blanking InputAvoid Deep Discharge Output Stages Configurable Filters and GainCircuit Description Differential LOW-NOISE Front ENDOverload Detection Battery Charger and PRE-REGULATORSMicroprocessor Rear Panel Interfaces Power RegulatorsFront Panel Batteries and P.E.MCalibration Offset AdjustmentFront END Replacement Calibration and RepairBattery Replacement SR560 Offset Adjustment ProcedureFuse Replacement Noise Contours Dynamic Reserve Input Voltage NoiseMaximum Calibration and Repair Introduction CommandsAppendix a Remote ProgrammingAppendix a Non-Essential Noise Sources Appendix BNoise Sources and Cures Intrinsic Noise SourcesInductive Coupling Capacitive CouplingMicrophonics Resistive Coupling or ‘Ground Loops’Thermocouple Effect Appendix B Front Panel Parts List SR560 Component Parts ListMain Board Parts List 22U MIN 01U Axial 804 00225-548 Insl MTP5N05 SR560 Component Parts List SR560 Component Parts List PIN Mach SR566 Assy Adhes Tape Miscellaneous Parts List SR560 Component Parts List

SR560 specifications

SRS Labs SR560 is a cutting-edge audio enhancement technology that has gained recognition for its ability to deliver an immersive sound experience. Built upon years of research, the SR560 utilizes proprietary algorithms to achieve high-fidelity sound output while maintaining an incredibly dynamic range.

One of the most notable features of the SR560 is its adaptive audio processing, which adjusts sound dynamics based on the content being played. This means that whether one is listening to music, watching a movie, or playing video games, the sound quality is optimized in real-time to provide the best listening experience. The SR560 excels at enhancing dialogue clarity in films, ensuring that important audio elements are never lost amidst background sounds.

Another key characteristic of the SR560 is its support for multi-channel audio. With the rise of surround sound systems, the SR560 is designed to integrate seamlessly with 5.1 and 7.1 speaker setups. This ensures that users can enjoy a true surround sound experience, where each audio channel is processed independently to create a lifelike auditory environment. The SR560’s processing capabilities allow it to convert standard stereo audio into multi-channel output, enriching the listening experience for any audio format.

SRS Labs has equipped the SR560 with advanced bass optimization technology. This feature enhances low-frequency sound, providing deep, rich bass without distortion. Whether it’s the thumping beats of music or the rumble of action-packed movies, the SR560 ensures that users can experience the full spectrum of audio without compromising on quality.

Furthermore, the SR560 showcases state-of-the-art sound management features that provide users with customizable audio profiles. This allows users to tailor their audio experience according to personal preferences, whether they prefer a more balanced sound, enhanced bass, or boosted treble frequencies. The intuitive interface ensures that adjustments can be made effortlessly.

In conclusion, the SRS Labs SR560 stands out as a versatile audio enhancement technology that caters to the needs of various audio consumers. By combining adaptive processing, multi-channel support, bass optimization, and customizable profiles, the SR560 ensures a rich and immersive audio experience. As the demand for high-quality sound continues to rise, the SR560 is poised to remain a significant player in the evolution of audio technology.
Top Page Image Contents