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Radio Design Labs ST-ACR2



Audio Control Relay

$139.99 $186.65
You save $46.66

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.

$139.99 $186.65
You save $46.66

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  • Main Features:
  • Switching Controlled by Audio Signal
  • Sensing of Line-Level Signal
  • Silence Sensing
  • DPDT Switching Contacts
  • Open-Collector SLAVE Output
  • Specifications:
  • Input Connections:May be connected balanced or unbalanced vControl OutputOpen-collector @ 25 mA suitable to drive indicators or slave LCR relay
  • Indicators:Audio threshold LED (for setting sensitivity)
  • Retrigger Delay250 ms
  • Contacts:Double-pole-double-throw
  • Max. Switching Power:60 W, 125 VA
  • Max. Switching Voltage:220 Vdc, 250 Vac
  • Max. Switching Current:2 A
  • Max. Carrying Current:3 A
  • Activation Response Time:25 ms
  • Input Sensitivity:-30 dBu to 0 dBu (adjustable)
  • Relay Release Delay:5 sec. to 50 sec. nominal (adjustable)
  • Power Requirement GROUND-REFERENCED, 24 Vdc @ 50 mA* * Assumes 20 mA max load at SLAVE output
  • Ambient Operating Environment:0° C to 55° C