Signal Processing Systems : Preamplifiers : RDL, Radio Design Labs - STM-3

High Gain Mic Preamp - 35 to 75 dB Gain

Series:

Model: STM-3

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

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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.

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

Inputs: 500 ohm balanced; 5 k ohm unbalanced
Phantom: 24Vdc; IEC 1938: 1996-12, Filtered
Output (2): +4 dBu 150 ohm 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 ohm 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
Operating Temperature (Maximum): 131 F
Operating Temperature (Minimum): 32 F

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RDL STM-3 High Gain Microphone Preamplifier - 45 to 75 dB gain

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