ST-ACR2 Line-Level Audio Controlled Relay – 5 to 50 s Delay

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SKU: RDL-STACR2 Categories: ,


  • Switching Controlled by Audio Signal
  • Sensing of Line‑Level Signal
  • Silence Sensing
  • DPDT Switching Contacts
  • Open‑Collector SLAVE Output
  • The ST‑ACR2 is an Audio Controlled Relay in the STICK‑ON® series. These products are designed for quick, convenient installation, and reliable operation in a variety of control applications. The ST‑ACR2 is designed to switch on line level sources.

    Two multiturn trimmers are provided. The SENS potentiometer adjusts the audio input sensitivity. A threshold LED facilitates accurate adjustment. The module can be set to trigger on signals between ‑30 dBu and 0 dBu. The DELAY control sets the time required for the relay to release when the audio drops below the threshold.

    The delay adjustment range for the ST‑ACR2 is from 5 seconds to 50 seconds.