Update: The 4011s arrived in good condition. The sockets arrived today
(I ordered a whole bunch with various numbers of machined pins as Tom
Miller recommended). All the sockets were of the "good" kind except for
the 14-pin sockets, which were the cheap kind in accord with Murphy's
Law. :-(
Pause while I get the right kind of 14-pin socket.
Jeremy
On 4/4/2017 11:52 AM, Jeremy Nichols wrote:
Thanks, everyone, for your inputs. I've ordered some NOS 4011s (made
by National Semi, mildly ironic since I used to work there) and some
supposedly round pin sockets (the reviews were mixed—some folks got
good stuff, some got junk).
I'll update the thread once I have everything here and installed.
Jeremy
On Mon, Apr 3, 2017 at 11:01 PM Tom Miller <[email protected]
<mailto:[email protected]>> wrote:
Also, you might install a high quality machined pin socket. Save the
non-replaceable PC board.
----- Original Message -----
From: "David C. Partridge" <[email protected]
<mailto:[email protected]>>
To: "'Discussion of precise time and frequency measurement'"
<[email protected] <mailto:[email protected]>>
Sent: Monday, April 03, 2017 9:33 PM
Subject: Re: [time-nuts] HP-59309A Clock counts only seconds
> You can get a brand new CD4011BE from pretty much most suppliers
at about
> 15 cents that won't exhibit the problems of the earlier ones.
>
> Dave
>
> -----Original Message-----
> From: time-nuts [mailto:[email protected]
<mailto:[email protected]>] On Behalf Of Jeremy
> Nichols
> Sent: 04 April 2017 00:44
> To: [email protected] <mailto:[email protected]>
> Subject: [time-nuts] HP-59309A Clock counts only seconds
>
> I have a new-to-me HP-59309A HP-IB Digital Clock. The clock
works on both
> the internal crystal oscillator and on an external 10 MHz standard
> (GPSDO). However, it counts only to 60 seconds and then repeats
without
> updating the minutes digit. The TIME SET (FAST and SLOW)
push-buttons work
> but again, the count will not update minutes and hours, only
seconds. The
> DAY SET procedure works correctly for days and months. All the other
> switches and buttons do what they are supposed to do. Using my
10526T
> logic pulser I can force the minutes and hours counters to work.
> The power supply is in good condition (after replacement of a few
> components) and I see no other problems (yet).
>
> Tracing the clock signal through the logic circuitry brought me
to U3 on
> the A4 board. This (U3) is a 4011 quad 2-input NAND gate in a
14-pin DIP
> package. It "connects" the seconds counter to the minutes
counter and
> appears to have failed. One of the people on the email list
> <[email protected]
<mailto:[email protected]>> commented that the
4000 series CMOS
> chips have a known limited lifetime. Since these parts are no
longer in
> production, the writer expressed the concern that any parts I
might find
> to buy may be DOA.
>
> Before I go hunting for parts, I'd appreciate hearing from
anyone in the
> group who has experience with the 59309A Clock and/or the
4000-series CMOS
> family. In particular, are there modern equivalents to my 4011
chip? If
> the 4000's really do have a limited lifetime I'd rather use a
substitute.
>
> Jeremy, N6WFO
>
>
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