[sdiy] Substitute for pin matrixes?

[karl dalen]

Buchla did some heavy outside box thinking back in the days!

KD

--- Den lör 2010-01-23 skrev Aaron Lanterman <lanterma at ece.gatech.edu>:

> Från: Aaron Lanterman <lanterma at ece.gatech.edu>
> Ämne: Re: [sdiy] Substitute for pin matrixes?
> Till: "Synth DIY" <synth-diy at dropmix.xs4all.nl>
> Datum: lördag 23 januari 2010 22.22
> 
> On Jan 23, 2010, at 11:14 AM, Derek Holzer wrote:
> 
> > In this vein, can anyone tell me how the program cards
> for the Buchla Music Easel work?
> > 
> > FROM http://www.buchla.com/historical/music_easel/music_easel.html
> 
> I've see Magnus has already responded to this - I'll just
> throw in a couple other notes...
> 
> The individual daughterboards tend to have inputs that are
> (more or less) like op amp summing nodes on an inverting op
> amp configuration. One resistor is off-board and hooked to
> the front panel pots (which have a couple of additional
> tapering resistors), and another resistor, if used, it on
> the card. A +13.5 V supply can be fed to the front panel
> sliders and/or the resistors on the card, or both, as
> determined by a switch. The summing aspect lets you pile the
> front panel setting *on top* of what is set by the card.
> Choosing different resistor values on the card lets you
> emulate various slider settings. 
> 
> The switches on the front panel (to select filter routings,
> etc.), for the most part, don't hook dircelty into the sound
> generating circuitry - they create settings for various CMOS
> switches, so the CMOS switch settings can be set by resistor
> values on the card.
> 
> It's quite clever - and from the card you can do all sorts
> of things that you can'd do from the front panel.
> 
> - Aaron
> 
> 
> 
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