Model PS1A User Guide
The Shure Model PS1A is an AC power supply that provides 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.
FEATURES
•Phantom powers one or two Shure condenser microphones or similar condenser microphones
•Use with balanced or unbalanced microphone inputs
•Low noise, hum and RF susceptibility
•Short-circuit-proof operation
•Operates with both microphone and line-level signals
•Usable over wide ac voltage ranges
•Three-pin XLR audio connectors
•Lightweight
•Rugged Construction
SPECIFICATIONS
All-silicon-transistor power supply
21.5 ± 1.5 Vdc, regulated (see Figure 1)
Positive (+) on three-socket microphone connector pins 2 and 3; negative (–) on pin 1 and case
©2006, Shure Incorporated 27A8087 (Rev. 1)
20 V at 1.5 mA (with Shure SM81 or SM85); 15 V at 8 mA (with Shure SM82)
1.69 k ± 1% (two per channel; see Figure 1)
+0/ –0.2 dB, 20-20,000 Hz (with SM81 or SM85 and 1k load)
Greater than ±24 dBm
25 mA each channel (pins 2 and 3 to pin 1)
Common Mode: –90 dBV maximum Differential Mode: –115 dBV maximum
Common Mode: 100 dBV maximum Differential Mode: –115 dBV maximum A-weighted, measured with true rms voltmeter Differential Mode: –131 dBV maximum
–115 dB or less
Corresponding pins of all connectors are in phase
90-132 VAC, 50/60 Hz or 180-264 VAC, 50/60 Hz (internal switch-selectable); power consumption 3 watts maximum
Operating: –7° to 57° C (20° to 135° F) Storage: –29° to 71° C (–20° to 160° F)
Professional audio (XLR): male (Output) and female (Microphone)
72 mm H x 156 mm W x 150 mm D (2-27/32 in. x 6-5/32 in. x 5-29/32 in.)
1.25 kilograms (2 lb 12 oz)
Aluminum front panel with steel cover; finished in gray enamel
Listed by Underwriters Laboratories, Inc.; listed by Canadian Standards Association as Certified
Printed in U.S.A.
SIMPLIFIED EQUIVALENT CIRCUIT (ONE CHANNEL)
FIGURE 1
OPERATION
POWER CONNECTIONS
Connect the AC power plug to a grounded 90 to 132 Vac, 50/60 Hz power source. Turn the Power switch to ON. 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
1.Unplug the AC line cord and remove the two self-tapping screws securing the top cover.
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“Live” or |
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“Earth” or |
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“Hot” |
Neutral |
“Ground” |
U.S., Canada |
Black |
White |
Green |
Europe |
Brown |
Blue |
Green/Yellow |
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