[sdiy] Seeking info on chip

[John L Marshall]

MC660 to 689, -30 to +75 degree C, MHTL, high voltage logic, 18 volts
MC7xx, +15 to +55 degrees C, RTL
MC8xx, Commercial, RTL
MC9xx, Mil Temp, RTL


MC1747 is a dual 741

Take care,
John
---------------------------------------------------------------------------
Pacific Northwest DIY Synthesizer meeting, July 20, 2002
See: www.sound-photo.com
---------------------------------------------------------------------------

----- 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 5:34 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. :)
> >
> >
> >
>
>
>