MCM Electronics

0.5 ~ 5 Second Delay Line Level Controlled RelayMCM Part #: 555-18872  |  Radio Design Labs Part #: ST-ACR1

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Line-Level Audio Controlled Relay

The ST-ACR1 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-ACR1 is designed to switch on line level sources.

Product Description

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-ACR1 is from 0.5 seconds to 5 seconds.


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

Specifications:
Audio Input: 10 kO balanced bridging
Input Connections: May be connected balanced or unbalanced
Control Output: Open-collector @ 25 mA suitable to drive indicators or slave LCR relay
Indicators: Audio threshold LED (for setting sensitivity)
Retrigger Delay: 250 ms
Contacts: Double-pole-double-throw
Max. Switching Power: 60 W, (220 Vdc,125 Vac, 2A)
Activation Response Time: 25 ms
Input Sensitivity: -30 dBu to 0 dBu (adjustable)
Relay Release Delay: 0.5 sec. to 5.0 sec. nominal (adjustable)
Power Requirement (Assumes 20 mA max load at SLAVE output): GROUND-REFERENCED, 24 Vdc @ 50 mA
Ambient Operating Environment: 0° C to 55° C

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Package Specifications & Dimensions
Weight:0.1 lbs.
Hazardous:No
RoHS Comp:Yes
Warranty:1095 days
Need to Return?
Length:4 in.
Width:2 in.
Height:2 in.
Shipping Information
Extra Shipping Charge:No
Drop Ship:No
Catalog Pages
Catalog/Page:

MCM Cat 57, Page 149

MCM Cat 56, Page 165

PDF Reference
Datasheet

Requires Adobe Acrobat Reader.

Mfr. Info

Radio Design Labs Logo
Mfr. Name:Radio Design Labs
Mfr. Part Number:ST-ACR1