[sdiy] modular conventions for input and output

[Jim Patchell]

I prefer to keep signals at +/- 5 volts, and if at all possible, all 
signal paths DC coupled...(this is so you can process CV signals with 
the same modules that you process audio).

nicolas wrote:
> Hello All
> 
> I am beginning to put together a few things and wanted
> to make sure I was on the right track so that what I
> build now will interconnect with what I might build in
> the future.  
> 
> What are the conventions for input and output voltage
> levels, impedance, coupling, etc?  Are there any good
> summaries of this stuff that you could recommend?
> 
> My understanding so far: - please correct me if you
> disagree
> 
> Voltages:  Up to around 10V p-p for audio, CVs are
> sometimes +/- 5V, sometimes 0-10V, generally 1V/octave
> (but not always).  
> 
> Inputs: Coupling capacitors and a volume pot are often
> first up for audio inputs, but if CVs are expected
> then coupling is generally DC.  Input impedances
> around 100K.
> 
> Outputs: Audio is sometimes AC coupled, CVs always DC
> coupled.  Volume pots sometimes, but often not. 
> Generally buffered to give an output impedance of
> around 10K or less.  It seems that if I want to keep
> the number of pots down, then I should be putting the
> volume pots on the input side, not on the output side.
>  But when to AC couple and when to DC couple?
> 
> TIA,
> Nicolas
> 
> 
> 
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