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2x1 Signal Sensing VGA & Stereo Audio Switcher
https://atlona.com/product/at-apc21a/
2×1 Signal Sensing VGA & Stereo Audio Switcher. Atlona AT-APC21A is a high performance, signal sensing VGA switcher. Simply senses the presence of a video signal and automatically switches to the active VGA source to be routed to a …
PAC ASAI-21 Dual Source RCA Audio Switcher with Signal …
https://www.amazon.com/PAC-ASAI-21-Source-Switcher-Sensing/dp/B004PHUH4I
This audio switcher connects two stereo RCA audio sources to one RCA audio input. It uses signal sensing on the second input to detect audio and …
Automatic SPDIF (Optical/RCA) Audio Switch from Beni_Skate ...
https://www.tindie.com/products/Beni_Skate/automatic-spdif-opticalrca-audio-switch/
The switch has an audio input search mechanism which keeps scanning the active inputs for a valid audio signal. If there are two or more active input signals (in my case TV and PC) but no valid signal (no audio playback) the switch keeps waiting for 12 seconds on one port for an audio signal before it jumps to the next port to wait another 12 seconds for a valid audio signal and …
Circuit-Audio Signal Detector/SwitchHobby Corner
http://www.discovercircuits.com/H-Corner/audiosignal%20detector%20switch.htm
The hobby circuit below will activate a transistor switch when it detects at least 50mv peak to peak of an audio signal. The switch could be used to turn on a relay, routing the signal to where it is needed. A single 3v lithium cell will power the electronic circuit for about 5 years.
Auto-sensing HDMI Switchers
https://www.hdtvsupply.com/hdswau.html
These auto sensing HDMI switchers have the latest audio video technology built in to auto detect active input source signals and automatically switch the active input to the output Unlike other switchers these switchers do not require human interface Once a signal goes away the switcher will automatically change to the other input NOTE A few devices like some DVR s cable satellite …
Amazon.com: RDL ST-ACR1 Line-Level Audio Controlled …
https://www.amazon.com/ST-ACR1-Line-Level-Audio-Controlled-Relay/dp/B004ZKY0FC
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. - Power Supply Not Included
Amazon.com: Mcm Custom Audio Automatic Two-Way …
https://www.amazon.com/Automatic-Two-Way-Source-Selector-Activated/dp/B00L9YVL90
RCA Switch Stereo 4 in 1 Out Audio Signal Source Switcher HiFi Input Selector Splitter Box. 4.7 out of 5 stars 103. 1 offer from $79.99. Nobsound Little Bear MC1022 Mini 2(1)-in-1(2)-Out RCA Stereo Audio Switch Audio Switcher Passive Speaker Manual Selector Splitter Box Audio Sharing.
Automatic RCA audio switch? | Audioholics Home …
https://forums.audioholics.com/forums/threads/automatic-rca-audio-switch.114160/
It seems that would do it but wonder how well it works for your purposes with the way it reacts to signal sensing when the B signal comes thru (in the product description). It also doesn't specify what the signal strength needs to be but if it works with typical audio line levels then it should be okay.
ST-ACR1 ‐ Line-Level Audio Controlled Relay - 0.5 to 5 s
https://rdlnet.com/product.php?page=130
Switching Controlled by Audio Signal. Sensing of Line-Level Signal. Silence Sensing. DPDT Switching Contacts. Open-Collector SLAVE Output. Product Resources. Description. Specifications. Related Products.
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