Radio Design Labs ST-ACR2

Line-Level Audio Controlled Relay - 5 to 50 s delay

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.

Features:
• Switching Controlled by Audio Signal
• Sensing of Line-Level Signal
• Silence Sensing
• DPDT Switching Contacts
• Open-Collector SLAVE Output