[sdiy] Ultrarough draft of my hot-rodding of the Music Easel ring mod

[Dave Manley]

>
>> 3. Not sure about this one: A common resistor, R11, is used connected 
>> to the + input of IC1B, IC2B, and IC2A.  R31 is used in a similar 
>> manner on IC3A, IC3B and IC4A.  I don't think you want to do this as 
>> it becomes a summing point for the bias/offset currents of the 
>> connected opamps.  Don't you really want separate resistors for all 
>> of these?  I defer to the analog masters on sdiy :-)
>
> I was wondering about that too, actually. I did it solely because 
> Buchla did it - but I have no idea if it's a good idea or not! I don't 
> know if he was trying to save pennies on resistors, save space, or if 
> there was a good reason to do it...
Another lesson in reading Buchla schematics!  I missed the asterisks and 
notes.  Given they have different reference designators, and in some 
cases different values, I guess he originally designed with separate 
resistors, and then found them unnecessary and added the note?  Seems 
hardly worth it to save the cost of a few resistors.

BTW, are there photo's of the "innards" of an Easel anywhere?  I've seen 
a few pics of the outside, but never the pcbs or mechanical assembly of 
the inside.

-Dave