RDL ST-ACR1M Microphone Level Audio Controlled Relay, 0.5 to Seconds Delay

Built to simplify audio-triggered control in security, surveillance, paging and AV monitoring applications, the Radio Design Labs ST-ACR1M Microphone Level Audio Controlled Relay detects mic-level signals and converts them into reliable relay actions. Ideal for automatically activating recorders, cameras, alarms or external processors, this audio controlled relay senses low-level microphone inputs from -65 dBu to -20 dBu using a front-panel SENS trimmer and a visible threshold LED for precise tuning. The DELAY control lets you tailor the relay release time from 0.5 to 5 seconds to avoid nuisance toggling during brief silences. With DPDT switching contacts and an open-collector SLAVE output, the ST-ACR1M integrates seamlessly into existing security and surveillance infrastructures or AV control chains. Its compact STICK-ON package makes installation fast and unobtrusive in racks, consoles, or behind equipment panels. Choose the ST-ACR1M when you need dependable, mic-level audio sensing and clean control logic for monitoring, recording, or alarm workflows—contact sales or add it to your system design today.

• Automatically switches on microphone-level audio to control devices, eliminating manual monitoring and reducing response time
• Wide sensitivity range (-65 dBu to -20 dBu) with front-panel SENS control and threshold LED for fast, accurate setup
• Adjustable release delay (0.5 to 5 seconds) to prevent chatter and ensure stable switching during short pauses
• DPDT relay contacts and open-collector SLAVE output provide flexible integration with security, AV, and control systems
• Compact STICK-ON form factor from Radio Design Labs enables quick installation in tight equipment racks or behind panels