Radio Design Labs STM-3 High Gain Microphone Preamplifier

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 STM 3 supply input is single ended and operates from 24 Vdc. Operation from 12 Vdc is possible with a 6 dB reduction in headroom. Each output drives high or low impedance loads. Features 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 Specifications Input:500 O balanced; 5 kO unbalanced Phantom:24 Vdc; IEC 61938: 2013, Filtered Output (2):+4 dBu 150 O balanced; -10 dBV unbalanced Frequency Response:50 Hz to 30 kHz (± 1.5 dB) Gain:Adjustable 45 to 75 dB THD+N: CMRR:> 50 dB (50 Hz to 20 kHz) Residual Noise: Headroom:> 20 dB (24 Vdc supply); 14 dB (12 Vdc supply) Phantom Power Input:24 Vdc @ 10 mA maximum Ambient Operating Environment:0° C to 55° C Power Requirement:GROUND-REFERENCED, 24 Vdc @ 25 mA Dimensions:Height: 0.7 in. (1.7 cm); Width: 3 in. (7.6 cm); Depth 1.6 in. (3.9 cm) Package Type:Cardboard Box Package Dimensions:2 x 2 x 4 in. Shipping Weight:0.195 lbs. WEEE weight:0.145 lbs.