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From: ayman@zip.eecs.umich.edu (Ayman Kayssi)
Newsgroups: sci.electronics
Subject: Re: schematic for mixer
Message-ID: <1991Jan4.224306.4844@zip.eecs.umich.edu>
Date: 4 Jan 91 22:43:06 GMT
References: <5863@bland> <1991Jan4.212337.10746@vicorp.com>
Organization: ACAL - EECS - U of Michigan - AA
Lines: 41

In article <5863@bland> lok@bland ( development) writes:
>Hi, does anyone out there know of any schematics for building a mixer with two input channels?  In
>addition, the signals being input can be modulated such that the output can have a echo effect.

	Here's a simple 2 channel audio mixer:

                                              
                                              R
           C                        +------/\/\/\/\---+ 
          ||      R                 |                 |
     V1 --||---/\/\/\/\----------+  |    |\ Vcc       |
          ||                     |  |    | \ |        | 
                                 +--+----|- \|        |
           C                     |       |   \        |
          ||      R              |       |    \       |
     V2 --||---/\/\/\/\----------+       |     \______|_______ Vo = -(V1+V2)
          ||                             |     /
	                                 |    /
                                         |   /
                                    +----|+ /|
                                    |    | / |
                                    |    |/ Vee
                                   GND 




	The values of the components can be 
		R= 47k ( good choice for audio applications )
		C= 0.1uF
		Vcc= -Vee= 9 V.
		Op Amp 741 for low to medium performance audio applications.
		Any other low noise type can be used for
		higher performance/fidelity.

								<Ayman>

-- 
[  Ayman Issam Kayssi                        |   Email:                      ]
[  Advanced Computer Architecture Lab.       |   ayman@caen.engin.umich.edu  ]
[  EECS Dept., Univ. of Michigan, Ann Arbor  |   ayman@eecs.umich.edu        ]