Wiring up something... need help

cristoff · 06-02-2004, 12:01 PM

I am making a sound mixer of sorts... inputs are cd player, mic's, tape player... all needing to go to an output of a master volume knob...

I was wondering if it be possible to use something so that the sound doesn't travel backwards... the power of the sound i guess is what i mean...

bigben2k · 06-02-2004, 12:49 PM

?!?

You normally mix the various lines before amplifying it. What do you mean by "sound doesn't travel backwards"?

cristoff · 06-02-2004, 12:56 PM

the power travel back up the other line...

what i mean is i am pre mixing... creating a mixer then amping the output...

bigben2k · 06-02-2004, 02:55 PM

Ah, you're talking about isolating the various inputs from each other?

Groth · 06-02-2004, 03:44 PM

You'd need to make an amplifier circuit. At the minimum, something along the lines of a variable gain diffence amp for each input, then feeding those into a summing amp.

In case you have no idea what I'm talking about, National Semiconductor has some good app-notes for their op-amps. Start with AN-20 "An Applications Guide for Op Amps".

If you value your time and audio quality, buying something professionally made is best.

bigben2k · 06-03-2004, 06:34 AM

Radio Scrap sells these pretty cheap, and work fine: it was my first one.

06-02-2004, 12:01 PM	#1
cristoff Cooling Savant Join Date: Mar 2002 Location: Mass Posts: 185	Wiring up something... need help I am making a sound mixer of sorts... inputs are cd player, mic's, tape player... all needing to go to an output of a master volume knob... I was wondering if it be possible to use something so that the sound doesn't travel backwards... the power of the sound i guess is what i mean... __________________ fr33t3chi3

06-02-2004, 12:49 PM	#2
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	?!? You normally mix the various lines before amplifying it. What do you mean by "sound doesn't travel backwards"? __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

06-02-2004, 12:56 PM	#3
cristoff Cooling Savant Join Date: Mar 2002 Location: Mass Posts: 185	the power travel back up the other line... what i mean is i am pre mixing... creating a mixer then amping the output... __________________ fr33t3chi3

06-02-2004, 02:55 PM	#4
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Ah, you're talking about isolating the various inputs from each other? __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

06-03-2004, 06:34 AM	#6
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Radio Scrap sells these pretty cheap, and work fine: it was my first one. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

06-02-2004, 03:44 PM	#5
Groth Cooling Savant Join Date: Mar 2003 Location: MO Posts: 781	You'd need to make an amplifier circuit. At the minimum, something along the lines of a variable gain diffence amp for each input, then feeding those into a summing amp. In case you have no idea what I'm talking about, National Semiconductor has some good app-notes for their op-amps. Start with AN-20 "An Applications Guide for Op Amps". If you value your time and audio quality, buying something professionally made is best.

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