Radio Design Labs STM-1 Microphone Preamplifier

$112.94
PA SKU # RDL STM1 MFR # STM-1 UPC # 813721011046
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  • Product Highlights
  • 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

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.
  • 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
  • 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
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