RDL STM-1

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.

PS24AS power supply not included.
 
Main 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