![](https://www.pic-control.com/blog/switching-relay-output-using-audio-signal/audio-signal-relay-st-acr1.jpg)
Application
- Switching Controlled by Audio Signal
- Switching from Mic or Line Signals
- Silence Sensing
- DPST switching relay output
- Open-collector slave output
Connection Setup
Device Wiring Connection
![](https://www.pic-control.com/blog/switching-relay-output-using-audio-signal/connection1-audio-wiring.jpg)
The module uses 24Vdc for powering up the audio sensing input and relay output.
![](https://www.pic-control.com/blog/switching-relay-output-using-audio-signal/connection2-supply-wiring.jpg)
Manual input to control the output relay.
![](https://www.pic-control.com/blog/switching-relay-output-using-audio-signal/connection3-manual-control.jpg)
You can purchase the module ST-LCR1 to extend out for more relay outputs.
![](https://www.pic-control.com/blog/switching-relay-output-using-audio-signal/connection4-additional-relay-output.jpg)
Specification
- Audio input: 10Kohm balanced bridging
- Input connections: may be connected balanced or unbalanced
- Control output: open-collectpr @ 25mA
- Retrigger delay: 250ms
- Relay output DPDT (up to 230Vac, 2A)
- Activation response time: 25ms
- Dimension: 17 x 76 x 39mm
Dimension
Product dimension size
![](https://www.pic-control.com/blog/switching-relay-output-using-audio-signal/dimension.jpg)
Audio Controlled Relays (other models)
ST-ACR1 Audio Controlled Relay
Relay is actuated by audio line level source.
ST-ACR1M Audio Controlled Relay
Relay is actuated by microphone input source.
ST-ACR2 Audio Controlled Relay
Can be used as a silence sensor detection device. Relay release delay is extended by 5-50sec.
ST-LCR1 Logic Controlled Relay
Logic controlled relay. Relay output is DPDT (dual pole dual throw)
ST-LCR2 Logic Controlled Relay
Pulsed controlled relay. Relay output is DPDT (dual pole dual throw)
ST-VOX1 Voice Activated Relay
Voice controlled relay output. Input voice can be from microphone or audio line level. Can be used in a voice intercom setup.
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