[time-nuts] +AFs-time-nuts+AF0- Wall Clock that takes 1PPS input

[Bill Beam]

The purpose of the series capacitor is to take the derivative of the square wave.
The first derivative of a positive square wave is a short positive pulse at the
leading edge followed by a short negative pulse at the trailing edge.

On Sat, 4 Jan 2020 17:27:15 -0500, Philip Gladstone wrote:

>You don't need a full square wave -- just a 100ms pulse every second with
>opposite polarity.

>Philip

>On Sat, Jan 4, 2020 at 5:16 PM Neville Michie <namichie at gmail.com> wrote:

>> It is far simpler to remove the clock battery, connect to the coil
>> terminals,
>> use a series capacitor and drive with a 0.5 hertz square wave. Just find
>> an
>> appropriate capacitor for the clock and the square wave voltage.
>>
>> cheers, neville michie
>>
>>
>> > On 5 Jan 2020, at 05:00, Gregory Muir <engineering at mt.net> wrote:
>> >
>> > Why not design a circuit similar to the GPSDO approach utilizing the 1
>> pps to synchronize a 32.768 kHz oscillator which could be applied to the
>> clock's divider input after it's internal oscillator has been disabled?
>> You could probably apply the signal directly to where the crystal used to
>> reside. This would allow universal application to any cheap clock with an
>> accessible crystal..
>> >
>> > Greg
>> >
>> > _______________________________________________
>> > time-nuts mailing list -- time-nuts at lists.febo.com
>> > To unsubscribe, go to
>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>> > and follow the instructions there.
>>
>>
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at lists.febo.com
>> To unsubscribe, go to
>> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>> and follow the instructions there.
>>
>_______________________________________________
>time-nuts mailing list -- time-nuts at lists.febo.com
>To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
>and follow the instructions there.


Bill Beam
NL7F