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Audio signal activated relay - Electronic Circuit
https://www.elcircuit.com/2016/09/audio-signal-activated-relay.html
Audio signal activated relay. Audio signal actiated relay , This Relay remains dormant until the op-amp activates upon sound via the electret-microphone. I only tested the 2-wire type. The input stage is a regular off-the-shelf 741 operational amplifier and connected as a non-inverting follower audio amplifier.
Relays for Switching Audio Signals
http://www.geofex.com/Article_Folders/relays/relays_for_switching_audio_signa.htm
Relays are some of the oldest switching parts available, butthey are misunderstood by many audio hackers. Here's a run down on the basicsand how to apply them. Relays are electro-magnetically activated switches. Literally,there is an electromagnet inside the relay, and energizing that electromagnetcauses the switch to change position by pulling the movable …
How can I use audio signal to actuate relay (or close dry ...
https://electronics.stackexchange.com/questions/32599/how-can-i-use-audio-signal-to-actuate-relay-or-close-dry-contact
Detecting audio and making a digital line wiggle is pretty easy: This circuit keeps Q2 not quite turning on. Just a little signal thru C1 causes it to turn on at least for part of each cycle, which makes OUT pulse low. OUT will swing nearly rail to rail and will be a clipped digital signal.
Voice-Activated Relay - Bogen
https://www.bogen.com/sites/default/files/2021-01/var1_specsheet.pdf
relay device. It shall be activated when an audio signal is detected at the microphone pre-amp or at 70V, 25V, or 600-ohm line level inputs. A slide switch shall be provided to allow selection of pre-amp or the line inputs. A VOX detect circuit shall be provided and shall include sensitivity and delay controls. The audio
VOICE-ACTIVATED RELAY Model VAR1
https://www.bogen.com/sites/default/files/2021-01/var1_manual.pdf
The VAR1 Voice-Activated Relay is a DPDT relay device that is activated when an audio signal is detected at the microphone pre-amp or at 70V, 25V, or 600-ohm line level inputs. It has a number of useful applications, such as muting a sound system in response to a microphone or telephone page, activation of accessory (secu-
Relay Switch Activated by Tone and Signal - EEWeb
https://www.eeweb.com/relay-switch-activated-by-tone-and-signal/
The signal and tone activated relay switch were used in a wide range of fields which includes measuring instruments, audio systems, communications equipment, and factory-automation equipment. They can also be found on telephone subscriber circuits for the polarity reversing switch, testing, and ringing functions. Relays signals Switch
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