Each of the ST-ACR products is an Audio Controlled Relay in the group of STICK-ON series products by Radio Design Labs. These products are designed for quick, convenient installation, and reliable operation in a variety of control applications.

ST-ACR2: This module is designed to switch on LINE-LEVEL sources, and has a longer release delay time making it the optimum choice for most music applications. The ST-ACR2 is widely used as a Silence Sensor.

Features:

• High-impedance bridging input connects across anyaudio lineim
• Input may be connected to either balanced orunbalanced sources
• Multiturn sensitivity adjustment permits precisethreshold setting
• Multiturn DELAY control adjusts relay release delay
• Bandpass filtering yields triggering oncharacteristic audio spectrum
• Secondary open-collector terminal allows additional relays to be added for more contacts (Radio DesignLabs' ST-LCR1 or ST-LCR2)
• Secondary terminal may be used with remote switch to manually override the control circuit and turn on the relay

Specifications:

• Audio Input: 10 kohm balanced bridging
• Input Connections: May be connected balanced or unbalanced
• Control Output: Open-collector @ 100 mA Suitable to drive indicators or Secondary LCR's
• Indicators: Audio threshold LED (for setting sensitivity level)
• Retrigger Delay: approximately 250 ms
• Relay Contacts: Double-Pole-Double-Throw
• Maximum Switching Power: 60 W, 125 VA
• Maximum Switching Voltage: 220 Vdc, 250 Vac
• Maximum Switching Current: 2 A
• Maximum Carrying Current: 3 A
• Power Requirement: 24 to 33 Vdc @ 50 mA, Ground-Referenced
• Input Sensitivity: Adjustable -30 dBu to 0 dBu This provides switching at a -20 dB threshold for signals of -10 dBu to +20 dBu
• Relay Release Delay: Multiturn adjustable 5.0 sec. to 50.0 sec. nominal
• Activation Response Time: 100 ms

NOTE:

Radio Design Labs' PS-24AS power supply isNOTincluded but isrequiredin order to power this product. Please see the"Accessories"tab or click here for more information on the PS-24AS power supply.