[sdiy] Seeking info on chip

[J. Larry Hendry]

All of the stuff is date coded 1978 and 1979.  Looks like a load of crap
according to one of our favorite synth designers.  :)
Larry


----- Original Message -----
From: John Loffink <jloffink at austin.rr.com>
To: 'J. Larry Hendry' <jlarryh at iquest.net>; 'synth DIY'
<synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, October 09, 2002 7:34 PM
Subject: RE: [sdiy] Seeking info on chip


I'm not sure exactly, but from the number series they sound pretty old.
MC7xx series from Motorola was RTL (Resistor Transistor Logic) from the
late 1960s.  I'd assume any MC6xx series proceeded that.  Diode
Transistor Logic maybe?

John Loffink
jloffink at austin.rr.com

> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl [mailto:owner-synth-
> diy at dropmix.xs4all.nl] On Behalf Of J. Larry Hendry
> Sent: Wednesday, October 09, 2002 6:44 PM
> To: synth DIY
> Subject: [sdiy] Seeking info on chip
>
> I came in to a stash of chips from a retired utility high voltage
fault
> sending device (commonly called a static relay).  Here they are, all
> socketed and ripe for picking and having fun playing with.  Many are
in
> the
> series from MC660 to MC689 Motorola, which mostly appear to be CMOS
logic
> gates and such.  I have found one site with brief descriptions (in
> Spanish)
> and no data sheets.
>
> But, the vast quantity are identified MC1747L.  That number led me to
a
> CA747E as a substitute.  That took me nowhere.  But, one of the chips
> seems
> to have been replaced with a UA747.  I found lots of data on that one
as a
> dual op amp with null offset adjustment capabilities.
>
> Any info about the suitability of said chip for audio or DC  or
general
> comments about the UA747 is welcome.  I'm gonna connect one up (as if
a
> UA747) and see if I get anything out of it beside smoke.
>
> Larry Hendry
> (who admits to dumpster diving on the job today)
> Twice I have pulled $400 Bud racks out of the dumpster. :)
>
>
>