The STƒ??RX2 has a single lineƒ??level audio input and two lineƒ??level audio outputs. In the absence of a control input, the NORMAL module output is fed from the audio input. When the TRIG control terminal is connected to ground, the input audio is fed to the SELECT output and the NORMAL output is switched off. When the TRIG terminal is again disconnected from ground, then the SELECT output is turned off and the NORMAL output is fed from the input. The module contains no relays or other mechanical devices. The control circuits utilize solidƒ??state switching to route the input signal to one of the balanced output line drivers with off attenuation better than 80 dB at all audio frequencies. Soft switching is used to eliminate clicks or pops.
The control current required at the TRIG terminal is so minimal (< 0.5 mA) that the STƒ??RX2 can be controlled from nearly any source from switches to logic circuits.
Power supply is required.
- Routing of a Line-Level Source
- Audio Switched to One of Two Destinations
- Silent Audio Switching
- Balanced or Unbalanced Routing
- Switching by Open-Collector Logic
- Switching Time: Fast Soft
- Time required for NORMAL output to turn off: 10 us 5 ms
- Time required for NORMAL output to turn on: 15 us 70 ms
- Time required for SELECT output to turn off: 15 us 10 ms
- Time required for SELECT output to turn on: 20 us 35 ms
- Control Signal: TRIG terminal must be externally connected to ground.
- Control Current: 0.5 mA
- Headroom: > 18 dB (above +4 dBu)
- THD+N: < 0.030% (1 kHz)
- CMRR: > 45 dB (100 Hz)
- Frequency Response:
- 15 Hz to 20 kHz (+/- 0.5 dB into 10 k ohms bridging input)
- 30 Hz to 20 kHz (+/- 0.5 dB into 600 ohms)
- Noise:
- < -85 dB (below +4 dBu);
- -90 dB (typical)
- ON Gain: Unity (Balanced input and output)
- OFF Attenuation: > 80 dB (Either output); > 95 dB at 1kHz
- Indicators (2): LED showing active output (left LED=NORMAL; right LED=SELECT)
- Power Requirement: GROUND-REFERENCED, 24 to 33 Vdc @ 40 mA
- Ambient Operating Environment: 0° C to 55° C
