-=> Roy J. Tellason said to Greg Mayman
 -=> about "BAG OF CHIPS" on 01-28-04  04:06.....

 RJT> Dunno what the difference is between that and the 1458, 5558, whatever
 RJT> the heck it is.

Lacking any data sheet on it, and trusting to my untrustworthy
memory, I think the 1458 was a direct replacement from Motorola
-- couldn't use the same number, could they? Motorola were like
that.

Their 4000 series CMOS chips all had the prefix MC1. I came
across an MC4040 chip at one time that turned out to be a TTL
phase detector IIRC. It was nothing like the CMOS 4040.

 RJT> I think I may go to AC coupling next time I start messing around with
 RJT> those 4066 chips.  I was going to try split supplies,  but then you
 RJT> need a +5/-5 logic swing for the control voltages and I'm not sure I
 RJT> want to go there. 

Where is the audio coming from and going to? I mean what supplies
does the other equipment use? If it already has a split supply it
is easy to derive the +5/-5v from that.

And you could use level translator chips - the 4049 and 4050 will
do that for you. Or a two transistor buffer will also do it.

 RJT> Oh really?  That's pretty bad,  10K isn't that much of a load.
 
That chip's single-ended output used an external 4700 ohn reistor
as a collector load. As we were feeding the output to the 10k
fader, via an audo switch, as well as to the cueing circuit via
another switch, the output was fairly sensitive to extra loading.
But a 741 (or 1/2 747) as a buffer fixed all that.

 RJT> Do you have access to a scanner?  :-)

No.

From Greg Mayman, in beautiful Adelaide, South Australia
   "Queen City of The South"    34:55 S  138:36 E

... Powered by Pepsi, pizza, and chocolate.
___ Blue Wave/386 v2.30

--- FLAME v2.0/b