Analogue systems

> -----Original Message-----
> From: analogue_systems@yahoogroups.com
> [mailto:analogue_systems@yahoogroups.com] On Behalf Of jalmari3
> Sent: Thursday, January 18, 2007 2:18 PM
> To: analogue_systems@yahoogroups.com
> Subject: [analogue_systems] Multiple question
> 
> It appears, that Analogue Systems RS170 multiple can be used as a unity
> gain mixer, while Doepfer A-180 cannot. What is the reason for this?
> RS170 looks a better buy...
> 
> From RS170 manual:
> "On other occasions, you may wish to mix signals before presenting them
> to a single input. If you wish to control the proportions in which this
> is done, you should use an RS160 or RS165 Mixer. If you simply wish to
> sum the signals, you can use the RS170 as a pair of passive 4-channel
> mixers with unity gain."
> 
> From Doepfer forum:
> "...In principle an A-180 cannot do this job [Mix 2 control voltages]
> as you never should short outputs (but that's what you do if you
> connect the CV out of an A-190 and A-155). In the A-100 nothing can be
> damaged by shortening outputs but it's a basic principle not to do that.
> For your application you need a mixer/adder..."