Audio combiner

S

Sarah and Rob

Guest
Hello everyone:

I'm looking for a schematic for a audio combiner that has a mute or cut-out
that mutes the non priority input when the priority input has voltage. I
want to make an audio combiner to listen to music from a CD Player in a
aircraft with my headset. I want to have the signal from the CD player cut
out when I have a transmission coming in over the aircraft radio.

Thanks in advance to anyone that can help.

Rob Gagné

sdrginyk@nt.sympatico.ca
 
On Sat, 21 Feb 2004 22:37:27 -0700, "Sarah and Rob"
<sdrginyk@nt.sympatico.ca> wrote:

Hello everyone:

I'm looking for a schematic for a audio combiner that has a mute or cut-out
that mutes the non priority input when the priority input has voltage. I
want to make an audio combiner to listen to music from a CD Player in a
aircraft with my headset. I want to have the signal from the CD player cut
out when I have a transmission coming in over the aircraft radio.

Thanks in advance to anyone that can help.

Rob Gagné

sdrginyk@nt.sympatico.ca

You could just use a relay driven from the squelch/COR line of the a/c
Click to expand...
radio.

Alan

++++++++++++++++++++++++++++++++++++++++++
Jenal Communications
Manufacturers and Suppliers of HF Selcall
P O Box 1108, Morley, WA, 6943
Tel: +61 8 9370 5533 Fax +61 8 9370 5106
Web Site: http://www.jenal.com
e-mail: http://www.jenal.com/contact.php
++++++++++++++++++++++++++++++++++++++++++
 
"Sarah and Rob" <sdrginyk@nt.sympatico.ca> wrote in message
news:peXZb.19098$d34.2031490@news20.bellglobal.com...
Hello everyone:

I'm looking for a schematic for a audio combiner that has a mute or
cut-out
that mutes the non priority input when the priority input has voltage.
I
want to make an audio combiner to listen to music from a CD Player in
a
aircraft with my headset. I want to have the signal from the CD
player cut
out when I have a transmission coming in over the aircraft radio.

Thanks in advance to anyone that can help.

Rob Gagné

sdrginyk@nt.sympatico.ca
Click to expand...
I've seen CdS photocells used in compressors, so they should work for
reducing the volume too. You run both the Cd and radio into a mixer,
and adjust them for equal volume. Then a part of the radio output is
rectified and used to drive a red LED, which shines on a CdS photocell.
This is put across the CD input to the mixer, so that as the radio gets
loud, the volume of the CD is reduced. If you use a larger capacitor on
the rectifier, it should keep the CD volume low for awhile after the
radio transmission has stopped.
 
"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:103gkiafjto0j82@corp.supernews.com...
you need to isolate the radio signal with an OP to act as the switch.
Click to expand...
First off, I think you are trying to explain this to someone who has
little experience with building that complex a circuit. And secondly,
even I don't know what an "OP" is, and I'm a tech. I think you meant
op-amp.


this switch anc simple switch a low power mini pc board relay
using an OP like a TL080 gotten from radio shaft you can make a
simple
voltage comparator.
i will try to explain the comparator.
create a voltage divider of lets say using 2 5k's in series.
one end to the Vcc (+) and the other end to ground..
the High End of this series should be a POT of 5k so that you can
use the center tap to bias the - input of the OP, the centap should
leed off to the - input with a 50K in series.
another 50k from the T section of the voltage divider to the
+ input of the OP..
now what you want to is have a diode from the OP output to
the
+ input of the OP, this diode can be a simple 1n914 type
(cheap)..
the anode on the OP output..
and cathod on the + input..
and have a capacitor of maybe .1 uf from the + input to the
ground.
so basicly what you have is when the OP trigures it will charge the
the cap because the OP output voltage will exceed the voltage
divider
and thus the diode will conduct placing a charge in the cap..
the the OP tries to go to the minus side i can't because the Cap is
holding it out of the window.
when the input stops from your radio the cap will start to discharge
and then unlatch..
the output of the OP should drive a simple 2N2222 to drive the
micro
relay..
your audio input should be pass through a .1 cap also through a 5k
and also through a 10k resister in series to the - input of the OP..
so basicly it simply forces the relay to open causing the audio to
disconnect from the CD play via the contacts of the relay and switch
in
the audio from your radio..
P.S
you will have to play with the Cap value on the + input to get your
delay off time set..
or put a pot in there also for that. :))
the relay needs to be a DTDP, the centers will be the
left and righ channels to your head set..
the NO sides will be left and righ ins.
NO side will be tied togetther for the radio in so that both sides
of
your head set gets audio from your mono radio.





Sarah and Rob wrote:

Hello everyone:

I'm looking for a schematic for a audio combiner that has a mute or
cut-out
that mutes the non priority input when the priority input has
voltage. I
want to make an audio combiner to listen to music from a CD Player
in a
aircraft with my headset. I want to have the signal from the CD
player cut
out when I have a transmission coming in over the aircraft radio.

Thanks in advance to anyone that can help.

Rob Gagné

sdrginyk@nt.sympatico.ca
Click to expand...
 
you need to isolate the radio signal with an OP to act as the switch.
this switch anc simple switch a low power mini pc board relay
using an OP like a TL080 gotten from radio shaft you can make a simple
voltage comparator.
i will try to explain the comparator.
create a voltage divider of lets say using 2 5k's in series.
one end to the Vcc (+) and the other end to ground..
the High End of this series should be a POT of 5k so that you can
use the center tap to bias the - input of the OP, the centap should
leed off to the - input with a 50K in series.
another 50k from the T section of the voltage divider to the
+ input of the OP..
now what you want to is have a diode from the OP output to the
+ input of the OP, this diode can be a simple 1n914 type (cheap)..
the anode on the OP output..
and cathod on the + input..
and have a capacitor of maybe .1 uf from the + input to the ground.
so basicly what you have is when the OP trigures it will charge the
the cap because the OP output voltage will exceed the voltage divider
and thus the diode will conduct placing a charge in the cap..
the the OP tries to go to the minus side i can't because the Cap is
holding it out of the window.
when the input stops from your radio the cap will start to discharge
and then unlatch..
the output of the OP should drive a simple 2N2222 to drive the micro
relay..
your audio input should be pass through a .1 cap also through a 5k
and also through a 10k resister in series to the - input of the OP..
so basicly it simply forces the relay to open causing the audio to
disconnect from the CD play via the contacts of the relay and switch in
the audio from your radio..
P.S>
you will have to play with the Cap value on the + input to get your
delay off time set..
or put a pot in there also for that. :))
the relay needs to be a DTDP, the centers will be the
left and righ channels to your head set..
the NO sides will be left and righ ins.
NO side will be tied togetther for the radio in so that both sides of
your head set gets audio from your mono radio.





Sarah and Rob wrote:

Hello everyone:

I'm looking for a schematic for a audio combiner that has a mute or cut-out
that mutes the non priority input when the priority input has voltage. I
want to make an audio combiner to listen to music from a CD Player in a
aircraft with my headset. I want to have the signal from the CD player cut
out when I have a transmission coming in over the aircraft radio.

Thanks in advance to anyone that can help.

Rob Gagné

sdrginyk@nt.sympatico.ca
Click to expand...
 
Jamie <jamie_5_not_valid_after_5_Please@charter.net> wrote:
well i am sorry, every one i know that works in the field does
know what am OP is.
Click to expand...
That may be, but many people on this newsgroup seem confused by the
term. Can you tell me what an OP is, and how it acts as a switch?

To the OP: 8*)

[I've done stuff like this in a previous life with analog switches and
TTL logic, so I'd think it would be fairly straightforward. I dunno
what modern analog switches are, but I'm sure someone can come up with
something. Depending on signal levels, DC bias, and other criteria, a
relay (as reccomended by Alan) actually might be easier...]

Some folks in the amateur radio groups can probably help you as well.

--
William Smith
ComputerSmiths Consulting, Inc. www.compusmiths.com
 
Thanks for the responses. Yes, I am a novice and my skills are limited to
reading a schematic and building from there.

--
Rob Gagné or Sarah Dando
101-5018 46 Street
Yellowknife, NT
X1A 1L3
867.766.2842
"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:103hhblh54vvgc1@corp.supernews.com...
well i am sorry, every one i know that works in the field does
know what am OP is.
I will try to keep it simpler next time or maybe not even try to help
at all.
I am sure others will appreciate that especially you. ;)


Watson A.Name - "Watt Sun, the Dark Remover" wrote:

"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:103gkiafjto0j82@corp.supernews.com...

you need to isolate the radio signal with an OP to act as the switch.


First off, I think you are trying to explain this to someone who has
little experience with building that complex a circuit. And secondly,
even I don't know what an "OP" is, and I'm a tech. I think you meant
op-amp.



this switch anc simple switch a low power mini pc board relay
using an OP like a TL080 gotten from radio shaft you can make a

simple

voltage comparator.
i will try to explain the comparator.
create a voltage divider of lets say using 2 5k's in series.
one end to the Vcc (+) and the other end to ground..
the High End of this series should be a POT of 5k so that you can
use the center tap to bias the - input of the OP, the centap should
leed off to the - input with a 50K in series.
another 50k from the T section of the voltage divider to the
+ input of the OP..
now what you want to is have a diode from the OP output to

the

+ input of the OP, this diode can be a simple 1n914 type

(cheap)..

the anode on the OP output..
and cathod on the + input..
and have a capacitor of maybe .1 uf from the + input to the

ground.

so basicly what you have is when the OP trigures it will charge the
the cap because the OP output voltage will exceed the voltage

divider

and thus the diode will conduct placing a charge in the cap..
the the OP tries to go to the minus side i can't because the Cap is
holding it out of the window.
when the input stops from your radio the cap will start to discharge
and then unlatch..
the output of the OP should drive a simple 2N2222 to drive the

micro

relay..
your audio input should be pass through a .1 cap also through a 5k
and also through a 10k resister in series to the - input of the OP..
so basicly it simply forces the relay to open causing the audio to
disconnect from the CD play via the contacts of the relay and switch

in

the audio from your radio..
P.S
you will have to play with the Cap value on the + input to get your
delay off time set..
or put a pot in there also for that. :))
the relay needs to be a DTDP, the centers will be the
left and righ channels to your head set..
the NO sides will be left and righ ins.
NO side will be tied togetther for the radio in so that both sides

of

your head set gets audio from your mono radio.





Sarah and Rob wrote:


Hello everyone:

I'm looking for a schematic for a audio combiner that has a mute or

cut-out

that mutes the non priority input when the priority input has

voltage. I

want to make an audio combiner to listen to music from a CD Player

in a

aircraft with my headset. I want to have the signal from the CD

player cut

out when I have a transmission coming in over the aircraft radio.

Thanks in advance to anyone that can help.

Rob Gagné

sdrginyk@nt.sympatico.ca
Click to expand...
 
"Sarah and Rob" <sdrginyk@nt.sympatico.ca> wrote:
Thanks for the responses. Yes, I am a novice and my skills are limited to
reading a schematic and building from there.
Click to expand...
OK, what's the output of your radio look like? Is there a "squelch
output", and what are it's characteristics?

--
William Smith
ComputerSmiths Consulting, Inc. www.compusmiths.com
 
well i am sorry, every one i know that works in the field does
know what am OP is.
I will try to keep it simpler next time or maybe not even try to help
at all.
I am sure others will appreciate that especially you. ;)


Watson A.Name - "Watt Sun, the Dark Remover" wrote:

"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:103gkiafjto0j82@corp.supernews.com...

you need to isolate the radio signal with an OP to act as the switch.


First off, I think you are trying to explain this to someone who has
little experience with building that complex a circuit. And secondly,
even I don't know what an "OP" is, and I'm a tech. I think you meant
op-amp.



this switch anc simple switch a low power mini pc board relay
using an OP like a TL080 gotten from radio shaft you can make a

simple

voltage comparator.
i will try to explain the comparator.
create a voltage divider of lets say using 2 5k's in series.
one end to the Vcc (+) and the other end to ground..
the High End of this series should be a POT of 5k so that you can
use the center tap to bias the - input of the OP, the centap should
leed off to the - input with a 50K in series.
another 50k from the T section of the voltage divider to the
+ input of the OP..
now what you want to is have a diode from the OP output to

the

+ input of the OP, this diode can be a simple 1n914 type

(cheap)..

the anode on the OP output..
and cathod on the + input..
and have a capacitor of maybe .1 uf from the + input to the

ground.

so basicly what you have is when the OP trigures it will charge the
the cap because the OP output voltage will exceed the voltage

divider

and thus the diode will conduct placing a charge in the cap..
the the OP tries to go to the minus side i can't because the Cap is
holding it out of the window.
when the input stops from your radio the cap will start to discharge
and then unlatch..
the output of the OP should drive a simple 2N2222 to drive the

micro

relay..
your audio input should be pass through a .1 cap also through a 5k
and also through a 10k resister in series to the - input of the OP..
so basicly it simply forces the relay to open causing the audio to
disconnect from the CD play via the contacts of the relay and switch

in

the audio from your radio..
P.S
you will have to play with the Cap value on the + input to get your
delay off time set..
or put a pot in there also for that. :))
the relay needs to be a DTDP, the centers will be the
left and righ channels to your head set..
the NO sides will be left and righ ins.
NO side will be tied togetther for the radio in so that both sides

of

your head set gets audio from your mono radio.





Sarah and Rob wrote:


Hello everyone:

I'm looking for a schematic for a audio combiner that has a mute or

cut-out

that mutes the non priority input when the priority input has

voltage. I

want to make an audio combiner to listen to music from a CD Player

in a

aircraft with my headset. I want to have the signal from the CD

player cut

out when I have a transmission coming in over the aircraft radio.

Thanks in advance to anyone that can help.

Rob Gagné

sdrginyk@nt.sympatico.ca
Click to expand...
 
On Sun, 22 Feb 2004 10:20:59 -0800 Jamie
<jamie_5_not_valid_after_5_Please@charter.net> wrote:

well i am sorry, every one i know that works in the field does
know what am OP is.
Click to expand...
Sounds like a word that has become local jargon where you work.

What does it mean to you? It means nothing to me. Op-Amp (operational
amplifier) sounds like a good guess, but it's still just a guess until
you let us know.

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------
 
well give that man a cookie..


Jim Adney wrote:

On Sun, 22 Feb 2004 10:20:59 -0800 Jamie
jamie_5_not_valid_after_5_Please@charter.net> wrote:


well i am sorry, every one i know that works in the field does
know what am OP is.


Sounds like a word that has become local jargon where you work.

What does it mean to you? It means nothing to me. Op-Amp (operational
amplifier) sounds like a good guess, but it's still just a guess until
you let us know.

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------
Click to expand...
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top