RDL ST-ACR1 Line-Level Audio Controlled Relay, 0.5 to Seconds Delay

Make audio signals do the work for you: the Radio Design Labs ST-ACR1 line-level audio controlled relay converts detected program-level audio into reliable control actions for monitoring, security and AV systems. This compact STICK-ON relay senses line-level inputs from -30 dBu to 0 dBu with an adjustable SENS control and threshold LED, so technicians can fine-tune sensitivity to real-world source levels and avoid nuisance switching. The DELAY knob provides a 0.5 to 5 second user-selectable release time to bridge gaps in dialogue or paging and maintain stable control of alarms, cameras, or automation triggers. Dual DPDT contacts and an open-collector SLAVE output let you drive multiple circuits or interface with control panels, recorders, and access systems without additional relays. Designed for surface-mount installation, the ST-ACR1 is an unobtrusive, reliable component for security, surveillance, broadcast monitoring, and commercial AV deployments. Backed by Radio Design Labs quality and a 3-year limited warranty, it’s an easy-to-install solution to add intelligent audio-based control. Add the ST-ACR1 to your next monitoring or security integration to simplify signal-driven automation.

• Automatically switches line-level audio sources to trigger downstream systems, reducing manual intervention and improving response times.
• Adjustable sensitivity (-30 to 0 dBu) with threshold LED for accurate setup and fewer false triggers in noisy environments.
• User-set release delay (0.5 to 5 seconds) to sustain outputs through brief signal gaps for reliable monitoring and paging applications.
• DPDT contacts plus open-collector SLAVE output allow control of multiple devices and integration with alarm, automation, or broadcast systems.
• Compact surface-mount STICK-ON form factor for fast, discreet installation in racks, enclosures, or field installations.