[sdiy] an XOR question

[Fredrik Carlqvist]

I’m sorry it seems this is not my day. I found more errors. It should be
like this.

For any 8-input mux, route A, B and C to the address inputs, then to each of
the inputs wire the following:

0	D
1	not D
2	not D
3	0
4	not D
5	0
6	0
7	0

Sorry if I caused any inconvenience


Fredrik C


________________________________________
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Schierl, Dan
Sent: Sunday, September 12, 2004 00:22
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] an XOR question

Hi list--
I have an application I'm working on in which I need to perform an exclusive
OR on 4 inputs. Since I don't think anyone makes a 4-input XOR, I tried to
rig something up using some CMOS chips. My first attempt was a little too
simplistic (i.e. wrong), which I didn't realize until I'd already wired it
into my application. I think my second attempt works (haven't tried it yet,
tho) but i think it might be overkill. 
 
Go here: http://people.msoe.edu/~schierld/temp/xor.html to see my two ideas.
 
My question is: the second idea is pretty much a literal definition of an
XOR gate, but I wonder if there are any trick ways to make one of these with
fewer chips. Any thoughts you might have would be appreciated. thanks!