I know that I have seen a few various commercial "Audio/Video" switches that do that same thing. They're not the cheapest ones ($30-50) but provide some nice features like Composite/S-Video Conversion, built in RF Modulator and etc.
You might check and see if you can find any schematics on the web for an "auto voice over" circuit like they use in PA systems. That might be a start?
The first problem you'll run into is that "nonzero" is not well defined. Every input always has a bit of noise, so it's never truly zero; at the same time, quiet passages (like the space between tracks) are a lot like zero. So you need a time constant in there, and a threshold algorithm. For instance, you could average the signal over the last 4-5 seconds and see which input has the highest signal, and switch to that. Of course, then it would take 4-5 seconds to switch.
Hello all,
This is my first post in this group.
I want to make an audio input switch for my stero system at home.
My sound system only has a single AUX input, although I've got a number of devices that i want selectively amplified through my sound system. I'm currently unplugging/replugging RCA wires, and i'm getting tired of it.
I was originally planning on simply buying 3 pairs of RCA connectors (input1, input2, output) and connecting them to a three-way (on-off-on) switch which could connect the output selectively to input1 or input2 depeding on its position.
But i am wondering how difficult it would be to make a small circuit capable of detecting current in both inputs and just outputting whatever input has a non-zero value, without losing any quality in the audio signal.
If both inputs have a non-zero value, it would just light up a LED to notify me that both inputs are receiving signals at the same time, and that i need to shut one of them off.
Any thoughts or links to web pages? I'm pretty new to designing my own elec circuits. I know what most electronic components do, but don't known how to select them and how to arrange them to make what i want.
thanks for your help
Not necessarily.
The detector could be fast attack slow decay. No prob really.
Also with control using say a uC ( or any latching system ) the 'last used input' could stay valid even without signal until another input claims priority.
But then again why not simply mix all the inputs and turn off the sources that aren't in use ?
Graham
Have you considered a simple mixer? It could be as simple as a passive mixer with just few resistors (few kiloOhms, say 5K each is nice). You turn on the source you want to hear and voila.
Tim
ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.