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I need to make my stereo output from a CD player into a mono signal for a PA
amp.
Is it just a matter of joining the 2 grounds together and the 2 signals or
does it need something else?
Help appreciated.
Thanks
Nick
Something else is required.
+++++++++++++Is there any chance you could explain this in a bit more detailOn Sun, 13 Nov 2005 14:48:50 +0000 (UTC), "Nottnick"
nmmnews@bellows.org.uk> wrote:
I need to make my stereo output from a CD player into a mono signal for a
PA
amp.
Is it just a matter of joining the 2 grounds together and the 2 signals or
does it need something else?
Help appreciated.
Thanks
Nick
Something else is required.
Tying two stereo outputs together is almost never a good idea - one
can be driving positive while the other is going negative and pull
more current than they were designed for.
You can add a resistor in series to each output and tie both of those
together and use that junction as the input to the PA amp. 1K or so
might be good.
+++++++++++++++ That's fine - it is a line output on a Denom componentYou want to use the "line" output of a portable (if it has one) a
component CD player will be line out as a matter of course. If the CD
player is designed to drive speakers directly the output may need to
be attenuated before it drives a PA amp - or it will overdrive the
input stages and cause distortion.
Grounds are another matter - most portable, and component CD players
use the same ground for both signals - so choose one and route it to
the PA (PA and CD plugged into the same outlet to avoid ground loops).
If you get a lot of hum/buzz there's a grounding problem -
Car CD players frequently use something called amplifier bridging. Two
amplifiers are used to drive the signal and signal return (not really
a ground) out of phase into the speaker - lets them get more watts out
with the power supply restricted to 12 volts. If you connect the
"grounds" together in that case you will burn up one or more
amplifiers.
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Take the output of the CD player right channel signal and connect a"default" wrote in message
news:uroen1pe18sj3q97k9otuq89bdk7o3qmkn@4ax.com...
On Sun, 13 Nov 2005 14:48:50 +0000 (UTC), "Nottnick"
nmmnews@bellows.org.uk> wrote:
I need to make my stereo output from a CD player into a mono signal for a
PA
amp.
Is it just a matter of joining the 2 grounds together and the 2 signals or
does it need something else?
Help appreciated.
Thanks
Nick
Something else is required.
Tying two stereo outputs together is almost never a good idea - one
can be driving positive while the other is going negative and pull
more current than they were designed for.
You can add a resistor in series to each output and tie both of those
together and use that junction as the input to the PA amp. 1K or so
might be good.
+++++++++++++Is there any chance you could explain this in a bit more detail
please.
Then the signal level should be fine for the PA input unless it is a+++++++++++++What do you mean by tie together - sorry, I'm good at soldering
etc.
+++++++++++++ I can follow instructions / diagrams but just don't know the
theory.
You want to use the "line" output of a portable (if it has one) a
component CD player will be line out as a matter of course. If the CD
player is designed to drive speakers directly the output may need to
be attenuated before it drives a PA amp - or it will overdrive the
input stages and cause distortion.
+++++++++++++++ That's fine - it is a line output on a Denom component
player.
RegardsGrounds are another matter - most portable, and component CD players
use the same ground for both signals - so choose one and route it to
the PA (PA and CD plugged into the same outlet to avoid ground loops).
If you get a lot of hum/buzz there's a grounding problem -
Change that to "Do the same to the left channel."Do the same to the right channel.
On Sun, 13 Nov 2005 23:31:41 -0500, default < > wrote:
Do the same to the right channel.
Change that to "Do the same to the left channel."
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WHy not use an RCA "Y" Adpter? Under $2.00You are a real star, thanks so much for your help
Nick
"default" wrote in message
news:1s4gn1la08mneeqnpv02du5d5heb9vco22@4ax.com...
On Sun, 13 Nov 2005 23:31:41 -0500, default < > wrote:
Do the same to the right channel.
Change that to "Do the same to the left channel."
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You can, providing that the impedance of the line out is high enoughWHy not use an RCA "Y" Adpter? Under $2.00
On Thu, 17 Nov 2005 09:03:25 -0600, "DBLEXPOSURE"
celstuff@hotmail.com> wrote:
WHy not use an RCA "Y" Adpter? Under $2.00
You can, providing that the impedance of the line out is high enough
to tolerate the loading, or the circuit is short protected. Low
impedance outputs will merrily self-destruct when shorted. The other
disadvantage is that the output of one channel may affect the feedback
in the other channel if it uses op amps.
Better safe than sorry, and the sound will be cleaner.
The minimal extra effort required seems well justified IMO.
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