Each of the STâ€‘ACR products is an Audio Controlled Relay in the STICKâ€‘ONÂ® series. These products are designed for quick, convenient installation, and reliable operation in a variety of control applications. The STâ€‘ACRâ€‘1M is designed to switch on lowâ€‘level sources, such as microphones or micâ€‘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 â€‘65 dBu and â€‘20 dBu. The DELAY control sets the time required for the relay to release when the audio drops below the threshold. The adjustment range is from 0.5 seconds to 5 seconds.