🚀 go-pugleaf

HELP!!! HELP!!! HELP!!!

i have to find an obselete chip from an obselete family of chips from
a company which is no longer in business.

How many of you have ever even heard of CTL family of chips?

It appears to use -5 volts and ground ( 5 volt difference in power 
supply voltages) and operates in both a digital and analog mode.

Yep, I was confused too.  By digital and analog I mean that it is
shown on the schematic as a quad 2 input AND gate chip BUT the
voltages coming out the output will lineraly track the input
voltage (at least at slow slew rates) operating as a linear
amp.

The chip is a 972 D (dip) M (temp range) manufactured by Fairchild
Semi-Conductors with a date code of 7534.

A call to National Semi-Conductor tech assistance (They bought
Fairchild a few years back.) provided the info listed above about
the family.  It seems that this chip was a very limited issue
short family series life which is not only obselete but was never
even close to common.

If you have one of these chips laying around or have any reasonable
ideas about where to get one, I SURE WOULD LIKE TO TALK TO YOU.
You can get back to me by E-Mail, landline (814) 732-2484 or
U.S. Post Office Hardcopy at:

142 Miller Building 
Edinboro University
Edinboro, Pennsylvania  16444
U.S.A.


Thanks for what ever help you might be able to give me.

Joe Pyrdek
Edinboro Univ.
Edinboro PA