Re: [neonixie-l] Re: "Keep Alive" Circuit

Fri, 07 Sep 2018 13:56:54 -0700

Mark,

My clocks seem to keep decent time; I regularly compare them to my "WWV" watch, and I think they average out to be fairly accurate.

How did you implement the DS1302 back-up?

Thanks. Jim

-----Original Message-----
From: Mark Moulding
Sent: Sep 7, 2018 2:36 PM
To: neonixie-l
Subject: [neonixie-l] Re: "Keep Alive" Circuit


My designs, which use an AC wall-wart for timekeeping (backed up by a DS1302 for power outages) all ran fast until I put in code to ignore all transitions for 16.5 mSec after seeing one (a full AC cycle is 16.67 mSec, at least in the US).  This seemed to completely cure my running fast problem.  Until I did this, the clock would run as much as 10 minutes per hour fast, due to the noisy line.

On Wednesday, September 5, 2018 at 11:47:21 AM UTC-7, [email protected] wrote:
(my clocks based on MM5531x chips, TTL logic, and CMOS logic all ran slightly fast and I blame that on counting excess noise pulses). 

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