[sdiy] simple audio mixer for single rail power source?

[Tim Parkhurst]

To tell you the truth, it is possible to hook up a mixer using only passive
components. As long as you only need to mix and you don't need gain, it's
easy to just throw together a passive mixer. A passive unit has it's
drawbacks, but it is the absolute simplest way to mix signals. 

If you do need to use an op amp, do a search for something using an LM324 or
possibly an LM3900. Both are capable of single supply operation. Also,
here's a nifty paper from Texas Instruments about running op amps normally
meant for dual supply operation on a single supply.

http://focus.ti.com/lit/an/sloa058/sloa058.pdf

Check it out. Lotsa neat tips.


Tim (blunt tips) Servo

"Imagination is more important than knowledge." - Albert Einstein




> -----Original Message-----
> From: Julian [mailto:julian at 22host24.com]
> Sent: Tuesday, September 14, 2004 10:15 AM
> To: Synth DIY
> Subject: [sdiy] simple audio mixer for single rail power source?
> 
> Hello there,
> 
> Im just after a design for about the simplest mixer i can achieve - just a
load of
> inputs, one output, and a pot for each ones
> inputs volume.
> 
> The catch is that i need it to be single rail.  Probably just running off
a 12v
> wall wart type affair.
> 
> Any suggestions?
> 
> Thanks, Julian
> 
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