x google shows at least 2 firms who make faders with microswitches fitted. That's what the pros use.
Proper faders have micro switches built in, normally at least two. One for "fader open" to mute the SLS or start a remote machine etc and one "overpress" for PFL. Ideally there needs to be some automatic way of only faders that are carrying a studio mic circuit mute the SLS. BBC studios use the screen of the jackfield mic plugging for this.
If you can't swap the faders or their price tag is too high or use a decent desk then don't feed the SLS with studio out but a mix-minus of the studio mics. This does lose the warning to people in the studio that a mic fader is off the backstop though.
In article , tinward scribeth thus
Wrote most of that before I noticed that you can't have some DIY job!..
It seems to me that you have a more conventional sound recording mixer i.e. one not designed for radio broadcast applications. If that is the case I don't know of any external unit that does this.
You need to have some indication that the Mic fader is up and off its end stop.
You can also use that switching signal for such things as "Mic Live" lights, necessary in radio broadcast.
Is this because you aren't allowed to modify the equipment or are unsure of how to do this?..
***************************************************************On most all desks there is a switch on the Microphone fader that when it comes off the end stop it then can operate a switching relay to do just that.
Most decent fader ranges do this such as Penny and Giles and some Alps ones have that as a fitment.
On some desks such as the Sonifex S2 series they use Voltage controlled amplifier/s for gain reduction and in those there is a control voltage usually from 0 to 5 Volts.
You could make up a detector and comparator circuit the one the voltage from the slider of the fader, consider it like a conventional volume control, comes of the 0 volts rest point your switching comparator detects this and does the necessary..
One some desks you might also find Overpress switches these are the other way around when you pull the fader towards you to switch a PFL circuit to give you a quick check of what's on that channel before fading it up..
As had been said, the normal way is via micro switches on the faders. A level sensing device wouldn't be much use for silence. ;-)
However, why are you feeding studio mics back to the studio foldback speaker?
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