[wlexxx]

say you have a fancy condenser mic, without a switch

of course it;s phantom powered, from the mixing board

what you want is a box that can temporarily mute its audio to the
board but without a big clunk sound

the box has
1. a footswitch
2. XLR in and
3. XLR out

what;s in the middle?

can you just short the + and -?

should be ok with the power supply but that changes the phantom power
load and may apply a differential signal if the resistors for that
channel are not precisely matched

also if the cord is long, there will be a capacitive charge/discharge
as the load changes..
?

next problem, what if you want to send audio from that mic temporarily
to a *2nd* mixing board, which has its own separate phantom power?

how can you do that without clunking on the first board?

assume the box also has power so it can have active components like
relays and logic

[[but hopefully not actual analog mixing with transistors, i only want
the signals to go through switches, not active circuitry]]


thx
wle.

[Les Cargill[_2_]]

wlexxx wrote:
say you have a fancy condenser mic, without a switch

of course it;s phantom powered, from the mixing board

what you want is a box that can temporarily mute its audio to the
board but without a big clunk sound

the box has
1. a footswitch
2. XLR in and
3. XLR out

what;s in the middle?

can you just short the + and -?

should be ok with the power supply but that changes the phantom power
load and may apply a differential signal if the resistors for that
channel are not precisely matched

also if the cord is long, there will be a capacitive charge/discharge
as the load changes..
?

next problem, what if you want to send audio from that mic temporarily
to a *2nd* mixing board, which has its own separate phantom power?

how can you do that without clunking on the first board?

assume the box also has power so it can have active components like
relays and logic

[[but hopefully not actual analog mixing with transistors, i only want
the signals to go through switches, not active circuitry]]


thx
wle.

http://www.fullcompass.com/product/235244.html

Can't tell if it's XLR but it says it supports condensers.

--
Les Cargill

[Geoff]

wlexxx wrote:
say you have a fancy condenser mic, without a switch

of course it;s phantom powered, from the mixing board

what you want is a box that can temporarily mute its audio to the
board but without a big clunk sound

the box has
1. a footswitch
2. XLR in and
3. XLR out

what;s in the middle?

can you just short the + and -?

Yes. Same as with non-phantom mics.

should be ok with the power supply but that changes the phantom power
load and may apply a differential signal if the resistors for that
channel are not precisely matched

That's why the are generally 1% or better.

also if the cord is long, there will be a capacitive charge/discharge
as the load changes..
?

How lng ?!!! Any way, not as much as an open cct.


next problem, what if you want to send audio from that mic temporarily
to a *2nd* mixing board, which has its own separate phantom power?

how can you do that without clunking on the first board?

Isolating mic splitter.

assume the box also has power so it can have active components like
relays and logic

Getting to the stage where it's gunna be better buying a mic with a mute
switch built in.


[[but hopefully not actual analog mixing with transistors, i only want
the signals to go through switches, not active circuitry]]

geoff

[Mike Rivers]

wlexxx wrote:

what you want is a box that can temporarily mute its audio to the
board but without a big clunk sound

the box has
1. a footswitch
2. XLR in and
3. XLR out

what;s in the middle?

A mixer with a channel mute switch.

next problem, what if you want to send audio from that mic temporarily
to a *2nd* mixing board, which has its own separate phantom power?

Ideally, you turn off the phantom power on one of the mixers. If you can't,
because they aren't both sharing all the mics and and one or both mixers
don't have individual phantom power switches, you can just "double power"
the mic and you probably won't have any problems. You won't blow up
either mixer or the mic. But the phantom voltage should be close on both
mixers. If you have one that provides 48V and the other provides 30V,
you could have the two "fighting."

Typically when connecting a mic to two or more mixers, though, a real
splitter is used, rather than just a Y cable. A transformer split will
isolate
the DC and let the audio through. That's a much better way to do it.

assume the box also has power so it can have active components like
relays and logic

Well, you could build the phantom powre into your switchbox, pick the
audio off with a transformer, and use a switch for the audio that shorts
the mic input with the mic off, and connects the mic to turn it on. As
long as you're only switching audio and not DC, you won't get a pop.

[Mike Rivers]

Les Cargill wrote:

http://www.fullcompass.com/product/235244.html
Can't tell if it's XLR but it says it supports condensers.

There's a schematic he
http://tinyurl.com/ProCo-Cough-Drop

Looks like it "shorts" pins 2-3 with a 100 uF capacitor, with
a 47K resistor in series when the mic is on, to keep the capacitor
charged. I suppose it'll work most of the time, pretty well. Simple
enough to build one and try it.

[Scott Dorsey]

wlexxx wrote:
say you have a fancy condenser mic, without a switch

of course it;s phantom powered, from the mixing board

what you want is a box that can temporarily mute its audio to the
board but without a big clunk sound

the box has
1. a footswitch
2. XLR in and
3. XLR out

what;s in the middle?

can you just short the + and -?

A capacitor shunted between + and - will do the job. Any broadcast supply
house will have a cough switch. They are common items.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."