switch for phanom powered mic

[IA76]

Hi

 

We made a toggle switch for a phantom powered mic which breaks all hot/cold/shield wires but the problem is that when you use the toggle switch it sound like you are plugging/unplugging the mic from the xlr socket with the power on and you get the 'pop noise.

 

How should a switch be wired so that it doesn't do this?

[DrV]

Connect it between pins 2 & 3. When the switch is closed it will short out the signal without affecting the phantom power. When it is open the signal will pass through as normal. Note that "switch on" = "mic muted" so you'll need to swap your labels round

 

Dave

[boatman]

Here's an extract from the schematic of a mic mute box I designed for a client. Just ignore the relay coil driver and replace the relay contact with your switch.

 

http://johnfromarran.org.uk/_Useful/MicMute.jpg

[Sound Man]

Here is another variation to the above circuit:-

 

http://www.crownaudio.com/media/storagebk/images/popless.gif

 

Simply shorting pins 2 and 3 doesn't work with condenser mic's as it will still pop when you switch it on/off. The additional components will stop this.

[IA76]

Thanks for the advice.

[IA76]

I just wanted to give an update on this.

 

We opened up a xlr switched base that we had found that all the switch did was short pin 2 & 3 together when in the off position. There were no resistors involved and when we replicate this on a switch it seems to do the job as there is no pop when switching the mic off anymore.

 

 

This is of course what Drv said in the first place!