STM-3 High Gain Microphone Preamplifier

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STM-3 High Gain Microphone Preamplifier - 35 to 75 dB gain

Radio Design Labs - High Gain Microphone Preamplifier - 35 to 75 dB gain

Low‑Noise, High‑Gain, Mic Preamp
Adjustable Output Levels
High or Low Impedance Mic Inputs
Mic Input to Line Outputs
Two Balanced or Unbalanced Outputs
Phantom Capability
RF‑Filtered Inputs

The STM‑3 is a quality low‑noise microphone preamplifier designed for use in surveillance, commercial sound, broadcast, and recording where higher than normal gain is required. The STM‑3 is very flexible, with gain adjustment from 45 to 75 dB, two balanced or unbalanced outputs, and available phantom supply input. Its low‑distortion and low‑noise performance make it the best choice, even when larger preamps could be used. The single‑ended supply input range is from 24 to 33 Vdc. Operation from 12 Vdc is possible with a 6 dB reduction in headroom. Each output drives high or low impedance loads.

Typical Performance:

Input:		500 Ω balanced; 5 kΩ unbalanced
Phantom:		24Vdc; IEC 1938: 1996‑12, Filtered
Output (2):		+4 dBu 150 Ω balanced; ‑10 dBV unbalanced
Frequency Response:		50 Hz to 25 kHz (+/‑ 1 dB)
Gain:		Adjustable 45 to 75 dB
THD+N:		< 0.05% (50 dB gain)
CMRR:		> 60 dB (50 Hz to 20 kHz)
Residual Noise:		< ‑70 dB (below +4 dBu, 150 Ω source)
Headroom:		> 20 dB (24 Vdc supply); 14 dB (12 Vdc supply)
Phantom Power Input:		24 to 33 Vdc @ 10 mA maximum
Power Requirement:		GROUND‑REFERENCED, 24 to 33 Vdc @ 25 mA
Ambient Operating Environment:		0° C to 55° C

Data/Installation

Mounting Accessories:

MB-1 Mounting Kit - RU, ST and TX Series	MB-3 Kit to Mount ST, TX Series Modules on FP Panel	MSR-1 Snap Rail Adapter - STICK-ON Series
RC-1U 19" Universal Rack Chassis - RU, ST and TX Series	RU-RA3A 19" Rack Mount for 3 RACK-UP Series Products	SMK-12 STICK-ON Mounting Plate
SR-10 STICK-ON Series 19" Mounting Rack - 10 modules	SR-12A STICK-ON Series 19" Mounting Rack - 12 modules	SR-4 STICK-ON Series Mounting Rack - 7 modules
STR-19A STICK-ON Series 19" Racking System - 12 modules	STR-19B STICK-ON Series 19" Racking System - 10 modules	UC-1 Single Wide Enclosure - RACK-UP Mounts
UC-2 Double Wide Enclosure - RACK-UP Mounts	WDG1 Table Top Chassis for RU, ST and TX Series	DRA-35S STICK-ON DIN Rail Adapter - 1 module
DRA-35S6 STICK-ON DIN Rail Adapter - 6 modules	ST-RRB1 Rear rack rail mounting kit for any STICK-ON module

General Accessories:

DTB
STICK-ON® Series Detachable Terminal Block

AMS
Accessory Mounting System

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Copyright © 2010 Radio Design Labs, Inc. RDL, Radio Design Labs, the RDL logo, STICK-ON, RACK-UP and the Rack-Up logo are registered trademarks of Radio Design Labs, Inc. Flat-Pak, RCX, SourceFlex, SupplyFlex, Sure-Lok, TX, ULTRASTYLE, and Specialists in Practical Precision Engineering are trademarks of Radio Design Labs, Inc. All other trademarks are the property of their respective owners. Typical Performance reflects product at publication time exclusive of EMC data, if any, supplied with product. Date last modified: June 29 2010

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