Model PS1A User Guide
Contents
1. ou 06 The Shure Model PS1A is an ac power supply that pro vides phantom power for one or two Shure SM81 SM82 SM85 or other condenser microphones The PS1A can be used with either balanced or unbalanced low impedance microphone inputs and is designed to handle both microphone and line level signals It features extremely low noise hum and RF susceptibility The PS1A will operate over a wide range of ac voltages and provides short circuit proof operation The PS1A contains a power switch power on indicator two each male and female XLR connectors and an internal voltage selector switch for 240 volt 50 60 Hz operation The PS1A is Listed by Underwriters Laboratories Inc and is listed by Canadian Standards Association as Certified Features e Phantom powers one or two Shure condenser microphones or similar condenser microphones e Use with balanced or unbalanced low impedance microphone inputs e Low noise hum and RF susceptibility Short circuit proof operation e Operates with both microphone and _line level signals e Usable over wide ac voltage ranges e Three pin XLR audio connectors e Lightweight e Rugged construction Listed by Underwriters Laboratories inc and listed by Canadian Standards Association as Certified SPECIFICATIONS Type All silicon transistor power supply Open Circuit Supply Voltage 21 5 1 5 Vdc regulated see Figure 1 Shure Brothers Incorporated 222 Hartrey Avenue2. Evanston IL 60202 3696 U S A Model PS1A User Guide Supply Voltage Polarity Positive on three socket Microphone connector pins 2 and 3 negative on pin 1 and case Typical Supply Operating Conditions each channel 20 V at 1 5 mA with Shure SM81 or SM85 15 V at 8 mA with Shure SM82 Power Supply Resistors 1 69 k 1 two per channel see Figure 1 Frequency Response 0 0 2 dB 20 20 000 Hz with SM81 or SM85 and 1k load Maximum Operating Level Greater than 24 dBm Short Circuit Supply Current 25 mA each channel pins 2 and 3 to pin 1 Hum and Noise 20 Hz 20 kHz unweighted Common Mode 90 maximum Differential Mode 115 dBV maximum Noise 300 H2 20 kHz unweighted Common Mode 100 dBV maximum Differential Mode 115 dBV maximum A weighted measured with true rms voltmeter Differential Mode 131 dBV maximum Crosstalk 115 dB or less Phasing Corresponding pins of all connectors are in phase Operating Voltage 90 132 Vac 50 60 Hz or 180 264 Vac 50 60 Hz internal switch selectable power consumption 3 watts maxi mum Temperature Range Operating 7 to 57 C 20 to 135 F Storage 29 to 71 C 20 to 160 F Connectors Professional audio XLR mate Output and female Microphone Dimensions 72 mm x 156 mm W x 150 mm D 2 27 32 in x 6 5 32 in x 5 29 32 in Weight 1 25 kilograms 2 Ib 12 02 Construction Aluminum front panel with steel co
3. placing the line cord with one having wire insulation colors as follows Live or Earth or Hot Neutral Ground U S Canada Black White Green Europe Brown Blue Green Yellow 5 Replace the top cover and mark the rear panel to reflect the new operating voltage REFERENCE DESIGNATION C101 C104 C105 C106 C107 0101 0102 0105 0108 0104 J101 J102 J103 J104 Q101 Q102 R101 R104 R109 S1 52 T1 w1 REPLACEMENT PARTS LIST SHURE PART OR COMERCIAL ALTERNATE Sprague 503D107F050PD Sprague 503D477F050QG Sprague 503D227F050QE Sprague 475M063AA3D Shure RKC21 Motorola 1N4002 DESCRIPTION Capacitor Electrolytic 100 pF 50V Capacitor Electrolytic 470 F 50V Capacitor Electrolytic 220 pF 50V Capacitor Electrolytic 4 7 nF 50V Diode Silicon Rectifier 100V 1 2A Zener Diode 22V 5 250 mW Connector Female XLR Microphone Connector Male XLR Output Transistor Silicon PNP Transistor Silicon NPN Resistor Metal Film 1 69 k 1 2W 1 Resistor Metal Oxide 47 1 2W Switch Slide DPDT Voltage Selector Switch Slide DPDT Power Transformer Power Line Cord 3 Conductor 2 7 m 7 ft Motorola 1N4115 Switchcraft Switchcraft D3M Shure 86A353 Motorola MPS U52 Shure 86C349 Motorola 2N5088 TRW IRC 0 60 RCA 830047 None None None Shure 95A8015 Parts listed as None should be ordered from Shure Brothers Inc listing product model numbe
4. r reference designation and part description Supplied in multiples of four only PRINTED CIRCUIT BOARDS CW Ed O0eV NOTES CIRCUIT DIAGRAM 1690 I 2W 19 1 69K 1 2W I LEOK 1 2W PA RIO LEK 2Wi e 1 ALL IN MFD AND SOV OR MORE UNLESS OTHERWISE SHOWN ALL ELECTROLYTIC CAPACITORS SHOWN IN MFD X VOLTS 2 RESETORS S IM WATT UNLESS OTHERWISE SPECIFIED 3 MARKING CHASSIS GROUND 7 MARKING BOARD GROUND 4c DENOTES OC VOLTAGE ALL VOLTAGES MEASURED WITH AC LINE i2OV 60 DC VOLTAGES MEASURED WITH 10 MEGOHM VTVM JACKS JI J2 J3 J4 UNTERMINATED VALUES ARE TYPICAL AND May VARY 215 VALUES MARKED WITH MAY WARY 45 ee eee eee eee isp l 158 x co 5014 11 1
5. s the system Avoid ground loops that may occur due to connector shells or the microphone case touching other metal objects Incor porate generally accepted audio grounding practices Note that a PS1A can be used with either balanced or unbalanced low impedance microphone inputs Power Connections Connect the ac power plug to a grounded 90 to 132 Vac 50 60 Hz power source Turn on the Power switch The LED lamp above the power switch will light when power is applied If the PS1A is to be operated from a 180 to 264 Vac 50 60 Hz power source the modification described in the next section must be performed SERVICE WARNING Voltages in this equipment are hazardous to life Refer servicing to qualified service person nel 240V Operation The PS1A is designed for operation from either a 90 to 132 Vac 50 60 Hz or a 180 to 264 Vac 50 60 Hz ac power source The operating voltage is selected by an internal switch and the unit is supplied with the switch set for 90 to 132 Vac operation For operation from a 180 to 264 Vac 50 60 Hz power source follow these steps 1 Unplug the ac line cord and remove the two self tapping screws securing the top cover 2 Remove the top cover 3 Locate the voltage selector switch and move it to the 240V position 4 Replace the line cord if necessary with one designed for the new ac source If the PS1A is to be used outside the U S and Canada local regulations may require re
6. ver finished in gray enamel Certifications Listed by Underwriters Laboratories Inc listed by Canadian Standards Association as Certified 1996 Shure Brothers Incorporated 27A8087 IF Printed in U S A MICROPHONE OUTPUT 21 5 VOC REGULATED SUPPLY SIMPLIFIED EQIVALENT CIRCUIT ONE CHANNEL FIGURE 1 OPERATION Installation WARNING To reduce the risk of fire of electric shock do not expose this appliance to rain or extreme moisture The PS1A can be installed anywhere along the micro phone line between the microphone and the mixer audio console amplifier or tape recorder and conven ient to an ac power source Connect one or two SM81 SM82 SM85 or other Shure condenser microphones to the PS1A Microphone connectors NOTE When using other manufacturer s condenser microphones with the PS1A verify that the voltage and resistance re quirements are compatible Connect a second cable from each PS1A Output con nector to a mixer input connector The design of the PS1A permits the simultaneous operation of both a microphone level and a line level condenser microphone The PS1A phantom powering system uses the balanc ed audio cable pair to carry the supply current to the microphone The cable shield is used as a ground return Use only high quality microphone cables as in termittent shorts between broken shield wires and the balanced conductors will interrupt the current causing larna noise transient
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