RDL STA-1M Audio Line Amplifier – Mono: -14 to 14 dB Gain

The STA-1M allows bridging any audio line, adjusting the gain, and driving a balanced or unbalanced line. The circuit design allows the input to accept either balanced or unbalanced signals, of either high or low impedance. This is an instrumentation type input stage which will amplify the differential input, regardless of ground reference. The output is capable of driving either high or low impedance loads, and the output may be connected either balanced or unbalanced.

RDL’s SupplyFlex power input configuration is included in the STA-1M. The power supply input may be fed from a floating (not ground-referenced) 24 Vdc power source, from a bipolar power supply (+/ 12 Vdc or +/-15 Vdc) or from a ground-referenced 24 Vdc power supply.

Required Power Supply


RDL PS24V

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Features:

• Single-Channel Audio Line Amplifier

  Balanced or Unbalanced Inputs and Outputs

  Bridge a Line to Avoid Loading

  High to Low Impedance Conversion

  Low to High Impedance Conversion

  Instrumentation Input to Isolate Ground Loops

  Precisely Match Audio Levels

  RDL SupplyFlex Power Input Configuration

Specifications:

• Input: 10 kΩ balanced or unbalanced bridge

  Outputs (2): 150 Ω balanced to drive low or high‑Z; 75 Ω unbalanced

  Output Signal: +4 dBu (nominal, adjustable)

  Frequency Response: 10 Hz to 20 kHz (+/‑0.25 dB)

  THD+N: < 0.05%

  Headroom above +4 dBu: > 18 dB

  CMRR: > 50 dB at full gain (100 Hz)

  Gain: Adjustable per chart below

  Unbal. Balanced : ‑7 dB +14 dB

  Bal. Balanced: ‑7 dB +14 dB

  Bal. Unbalanced: ‑14 dB +7 dB

  Unbal. Unbalanced:‑14 dB +7 dB

  Power Requirement: GROUND‑REFERENCED or FLOATING, 24 to 33 Vdc @ 50 mA

  Ambient Operating Environment: 0¡ C to 55¡ C