[sdiy] Serge and multiples

[Tony Clark]

> > Think about
> > this,  use a op-amp buffer with the positive pin tied to your
> > banana jack
> > input.  Also tie a 100K resistor to the positive pin which is
> > now your
> > normalized input.  When you plug into the jack, you
> > effectively bypass
> > the normalized input since the signal is being injected right
> > into the
> > op-amp positive input and the normalized signal is shut off
> > by the 100K
> > impedance.
> 
> But if you have 1k resistors on your outputs, you would have a noticeable
> amount of the normal signal even when over-ridden by an input.
> You'd have to trust yourself never to short unprotected direct outputs, or
> plug two outputs together and not realise.

   Well yes, but the effect wouldn't be that great.  Anyway, in this 
situation, there really isn't any point in having 1K resistors on the 
outputs as you can't short out a signal on a banana jacked modular!  
Heck, I don't even see it as being very necessary on any modular since 
practically every modern op-amp is short-circuit protected (most can go 
indefinately), and it's unlikely that you could short out enough to cause 
a serious current draw.
   I find that the only time output resistors are necessary is on the 
outputs that are interfacing with other gear.

   Tony

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