RDL STM3 Data Sheet

STICK-ON® SERIES
Model STM-3 High Gain Mic Preamplifier
High Gain Microphone Preamp
Adjustable Output Levels
High or Low Impedance Mic Inputs
To Convert Line Inputs to Mic Inputs
Two Balanced or Unbalanced Outputs
Separate Phantom Supply Input
RF Filtered Inputs and Outputs
Low-Distortion Performance
You Need The STM-3!
The STM-3 is part of the group of STICK-ON products from Radio Design Labs. The STM-3 is a quality microphone preamplifier designed for use in commercial sound, broadcast, and recording applications. The STM-3 is very flexible with gain adjustment from 0 to 75 dB, two balanced or unbalanced outputs, and available phantom supply input! Its compact size makes it ideally suited to locations where a larger or heavier preamplifier cannot be used. The high gain of the STM-3 makes it useful with normal mics in facilities using a +8 dB standard. It is also suited for use with ceiling mics or speakers designed to pick up general activity in a room requiring more than usual gain. Some features of the STM-3 are:
Balanced microphone input accepts impedances from 150 to 600
Input circuitry permits connection of unbalanced microphones, or 4 or 8 speakers in intercom or
monitoring applications
Variable gain (up to 75 dB) and ample headroom allow operation with any mic
Phantom supply input terminals allow connection of external power when STM-3 is used with phantom
powered microphones
Supply input is single-ended and operates from 24 Vdc to 33 Vdc (12 Vdc at reduced headroom)
Two separate outputs are provided for balanced operation
No lugs required for reliable connections
Convenience of STICK-ON package yields quick, efficient installation
Use STM-3 in conjunction with other RDL STICK-ONs to make complete audio systems
Anywhere you need a high-gain Mic to Line preamplifier, STM-3 is the reliable and cost-effective solution!
RDL •• P.O. Box 1286 •• Carpinteria, CA., USA 93014 •• (805) 684-5415 •• FAX (805) 684-9316 •• http://www.rdlnet.com
STICK-ON® SERIES
Model STM-3 High Gain Mic Preamplifier
ALTERNATE INPUTS
INPUT PHNTM
SPEAKER
SIGNAL
FROM
USED AS
MIC
UNBALANCED
MIC-LEVEL
SOURCE
EACH OUTPUT MAY BE BALANCED OR UNBALANCED
PHNTMINPUT
AUDIO
WIRING
25 TURN
GAIN
ADJUST
Installation/Operation
EN55103-1 E1-E5; EN55103-2 E1-E4
Typical Performance reflects product at publication time exclusive of EMC data, if any, supplied with product. Specifications are subject to change without notice.
PROFESSIONAL ADJUSTABLE
INPUT PHNTM G A
I
N
SIGNAL
FROM BALANCED MIC-LEVEL
SOURCE
MICROPHONE PREAMPLIFIER
UNBALANCED
LINE-LEVEL
EQUIPMENT
OUTPUTS
A B P
SIGNAL
FEEDING
BALANCED
LINE-LEVEL
EQUIPMENT
FEEDING
PWR
SIGNAL
O W E R
PBA O W E R
POWER WIRING
OR
OPTIONAL JUMPER TO PROVIDE PHANTOM VOLTAGE TO CONDENSER MIC WHICH CAN USE UP TO 32 VOLTS PHANTOM
G A
I
N
PROFESSIONAL ADJUSTABLE MICROPHONE PREAMPLIFIER
G A
I
N
BATTERY
PHNTMINPUT
-+
OR EXTERNAL
PHANTOM
SUPPLY
(UP TO 48V)
OUTPUTS
PWR
24 VDC
POWER
SOURCE
NOTE THE STM-3 WILL OPERATE (WITH REDUCED HEADROOM) ON
SUPPLY VOLTAGES FROM 9 VDC TO 23 VDC.
PROFESSIONAL ADJUSTABLE MICROPHONE PREAMPLIFIER
PHNTMINPUT
TERMINAL
IS COMMON
GROUND
THIS
OUTPUTS
24 VDC
POWER
SOURCE
PWR
PBA O W E R
TYPICAL PERFORMANCE Input Impedance: 150 to 600 balanced; 5 k unbalanced Output Impedance: 150 balanced to drive balanced or unbalanced lines of 150 or higher Output Levels: +4 dBu balanced Frequency Response: 50 Hz to 25 kHz (+/- 1 dB) Gain: Adjustable 0 to 75 dB THD+N: < 0.050% CMRR: > 60 dB (50 Hz to 30 kHz) Headroom: > 20 dB (24 Vdc supply); 14 dB (12 Vdc supply) Power Requirement: 24 to 33 Vdc @ 25 mA, Ground-referenced (9 to 23 Vdc with reduced headroom)
891-0016H
Radio Design Labs Technical Support Centers
U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506
Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287
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