[time-nuts] Scope Clock

Robert Atkinson robert.atkinson at genetix.com
Thu Aug 2 03:46:26 EDT 2007

Hi Nigel & Eric,
I've just order one of Jan's clocks. He has just got PCB's back in
stock.  I looked quite carefully and 1PPS is standard. The board has a
PCF8563 RTC chip with a 1PPS output that is used by the microprocessor.
The signal line has a 2 pin header that has a jumper for internal 1PPS
or you can use the header to supply an external 1PPS.
The clock has two basic modes of operation, one where the microprocessor
just reads the RTC and displays that time, the other (AVR Master Clock)
where it counts the 1PPS. While in master mode it updates the RTC to use
for reversion in case of power fail (The RTC has battery back-up on the
It looks like a great little board. The only limitation I can see is
that the ADC's are un-buffered R/2R ladder types with fairly high output
impedance. I want to drive a small X-Y display so I think I will have to
build a buffer amplifier.
I'll keep the group up dated.

Robert G8RPI.

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of GandalfG8 at aol.com
Sent: 31 July 2007 23:32
To: time-nuts at febo.com
Subject: Re: [time-nuts] Scope Clock

); SAEximRunCond expanded to false
Errors-To: time-nuts-bounces+robert.atkinson=genetix.com at febo.com RETRY

In a message dated 31/07/2007 23:23:38 GMT Daylight Time,  
eric.fort at gmail.com writes:

as  ordered will these boards accept 1pps or was yours a  special?


Hi Eric
Take a look at.....
It looks like the 1PPS is standard.
I've got a 12 inch X-Y display doing nothing right  now......
and I'm very tempted to have a play with one of these:-)

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