RDL STM-1 Microphone Preamplifier

Microphone Preamplifier - 50 dB Gain The STM-1 is a low-cost quality microphone preamplifier designed for use in commercial sound and broadcast applications. The compact size makes it ideal where a larger or heavier preamp cannot be used. The high-performance circuit provides a fixed 50 dB gain to bring any mic-level signal up to the line-level range of nearly any line input. The STM-1 supply input is single ended and operates from 24 Vdc. Operation from 12 Vdc is possible with a 6 dB reduction in headroom. For intercom applications, the input will operate directly from a speaker.Features: High or Low Impedance Input Mic Preamp Fixed 50 dB Gain for Consistency Balanced or Unbalanced Output Phantom Capability RF-Filtered Inputs and Outputs Excellent Performance STICK-ON Convenience Specifications: Input: 500 Ω balanced; 5 kΩ unbalanced Phantom:24Vdc; IEC 1938: 1996-12, Filtered Outputs (2): +4 dBu 150 Ω balanced; -10dBv unbalanced Frequency Response: 50 Hz to 20 kHz (+/- 1.5 dB) Gain: 50 dB nominal THD+N: < 0.05% CMRR: > 60 dB (50 Hz to 30 kHz) Residual Noise: < -70 dB (below +4 dBu; 150 Ω source @ 50 dB gain) Headroom: > 20 dB (24 Vdc supply); > 14 dB (12 Vdc supply) Phantom Power Input:24 Vdc @ 10 mA maximum Power Requirement: GROUND-REFERENCED, 24 Vdc @ 25 mA Ambient Operating Environment:0 C to 55 C