What IC is that?

[adam30732]

Well, this afternoon I opened up some of these old orange box down in the corner of my basement and found
this 6 digit led clock. It's a bare bone unit without case. It was my first electronic project back to
the late seventies. I recall at the time these non stopping advancing seconds display was such
attraction to me. I want to restore it to a working unit.

Looking at my old clock I realize that it has no power supply and no IC.It has a 24 pin IC socket on
the circuit board. I must have misplaced the IC somewhere. I wish if someone can lend a helping hand
identifying what IC was used in this seven segment clock. I think it might be a TexasInstrument IC but
I am just guessing. There are no timer no crystal but transistors,resistors capacitors and diodes.
The board has "Quest" printed on it.

 

[kellys_eye]

The timing for older clocks was often established from the incoming mains supply (50/60Hz depending on your country).
The IC might be something like the 5316....

Many, many ways to skin that particular cat!

 

[adam30732]

Thanks for the quick reply. I think I finally got it, at 24 pins it must be the National Semiconductor MM5314N. But at $20 a piece I'll think about it. Many thanks for looking it up for me.