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silent mic A/B footswitch
silent mic A/B footswitch
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Old 10th January 2018, 08:09 AM   #1
rockstudio is offline rockstudio  United States
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Join Date: May 2005
Location: St. Simons Island, GA
Default silent mic A/B footswitch

Hi all, I'd like to build a silent A/B footswitch for a band with whom I run FOH on tour. The band is currently using a Radial hotshot ABi, however it makes a very loud "snap" through the entire PA every time he presses it.
Radial HotShot™ ABi - Line Input Selector
I have been making talkback boxes for recording studios using a silent switch circuit that was once listed on the Crown audio website.
(I drew a quick version)
Click the image to open in full size.

This circuit is actually a lowpass filter at around 1hz. I was thinking about building two of these circuits (one for each mic) so each mic would mute/unmute with the footswitch. However, I don't know enough about electronics to know if this would work or not. The microphones are dynamic, although there is phantom power running on all channels (limitation of the monitor rig console). Is there a better / propper way to do this?
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Old 10th January 2018, 09:49 AM   #2
turk 182 is offline turk 182  Canada
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your drawn version did not upload.
what monitor console are you using?
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Old 10th January 2018, 02:06 PM   #3
Enzo is offline Enzo  United States
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Location: Lansing, Michigan
The mics do not need the phantom? Try lifting the phantom out of the circuit. Maybe add a couple blocking caps. Pops usually mean some level of DC is being switched.
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Old 10th January 2018, 02:57 PM   #4
turk 182 is offline turk 182  Canada
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five bucks says the need for phantom comes from condensers for cymbals, not sure why it's not being assigned from FOH though?
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Old 10th January 2018, 04:43 PM   #5
rockstudio is offline rockstudio  United States
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Join Date: May 2005
Location: St. Simons Island, GA
Here is the circuit that I drew (hopefully it shows up) from Crown:
Click the image to open in full size.

The pop occurs even with phantom power off. The monitor console is a mackie 1608.
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Old 10th January 2018, 05:12 PM   #6
turk 182 is offline turk 182  Canada
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still no joy on the image, can you not upload it here?
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Old 10th January 2018, 09:36 PM   #7
Enzo is offline Enzo  United States
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Location: Lansing, Michigan
Right click and then open in new tab, now I can see it.

Tack a high value resistor across the switch to keep the 1000uf cap charged. Does that help your pop? Switching unterminated caps in and out of the signal path is asking for pops.
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Old 11th January 2018, 05:03 AM   #8
rockstudio is offline rockstudio  United States
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Join Date: May 2005
Location: St. Simons Island, GA
Enzo, the circuit that I drew is a silent switch. I don't know what the circuit of the Radial pedal is. i would like to build a new pedal featuring two of the pop-less circuits tied together at the output, as to mute one mic while the other is un-muted.
I don't know how to upload the graphic to this forum, so I'll try the old HTML img src tags...
HTML Code:
<img src="https://photos.google.com/album/AF1QipPYEtXOBXM24p9j7dTsy-KCkz8VgvRC_Pi6f_ag">
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Old 20th January 2018, 09:05 AM   #9
drmcclainphd is offline drmcclainphd  United States
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Join Date: Aug 2013
Location: Abingdon, Virginia
Take a look at an Ernie Ball 6165 stereo volume/PAN pedal. Two in, two out, Set it for pan operation (as A +, B -; as A -, B +). Run your two sources in, run the two outputs into a straight on Y chord, and Bob's yer uncle. The "switching" is not instantaneous. So what? You can slam an expression pedal to one limit or the other PDQ. Still the switching is actually a fade. You may not want it to fade now, and may never. Fine, slam that pedal. But, "now" that you have it, you might try fading between the sources and see if the smooth (ie. slow) fade is useful. I eliminated the A/A+B/B switch on my Telecaster with two volume switches, one for each of the pickups. Not only will I never have clicks, I have way more control over my output than the old switch could give. You want to build it? I got a 4 mono in, 1 mono out (with a delay effect) little bity mixer for $40 or so (from B&H I think). Get one, take out two of the input pots, hook them up reciprocal on a pedal (two slabs of wood connected by a hinge, and you'd have it made with two more inputs to make into another such device, or any other thing you'll dream up later. Don't think outside the box, tear the box apart and use the pieces to build a better box.
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