[sdiy] CVs and passive mixers

[Terrence McWee]

At the risk of sounding like the complete newbie that I am, am I correct 
in assuming that the passive mixer outlined below (basically X number of 
inputs connect to a common out via a 4.7K resistor) could be expanded 
more or less indefinitely?  What's the max number of inputs that could 
be mixed in this way?  And what governs the resistor choice (I seem to 
recall someone saying they'd favor 10k over 4.7k in this application)?

Sorry to be somewhat lame; still learning (and learning a great deal 
from lurking on this list)

Thanks Much,
T.McWee


On Wednesday, May 15, 2002, at 07:20  PM, magic_silver_box! wrote:

> Unfortunately I am newbie enough with electronics to have to ask this. 
> I've made a passive mixer of a very simple design, consisting of four 
> RCA ins, each connected via a 4.7K (1/4 watt? small ~1cm x 2mm, sorry, 
> retarded) resistor to a small wire that runs along each input to the 
> single RCA output. It works wonderfully for combining audio sources, 
> with no noise and a small drop in amplitude for each source. I am 
> wondering if it can be used to combine a CV from one device and another 
> CV from another device, adding them together. I guess the reason I need 
> to ask someone this is I don't know the voltage and amperage of audio 
> signals and CVs. Would the control voltages overload the resistors, or 
> be reduced too drastically by them, or would there be some other 
> problem? Would I even need resistors? Also, if I send a CV to more than 
> one source, will it be reduced significantly/predictably? Anything else 
> I need to consider? Thank you!
> -Brian
>
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