[time-nuts] WWV or Net Clock controlled oscillator

[Bob kb8tq]

Hi

A very normal way to get the 60 Hz into the clock chips is to pull it off
of something like the 24V transformer winding. They run through a resistor
over to a limiter circuit to turn the sine wave into a square wave. That
square wave heads into the input pin on the clock chip. Some “quality time”
spent working out what’s what on the pc board should allow you to find 
the relevant section of the board. 

Once you find the right stuff, it should be as simple as opening up a 
resistor and running a jumper wire to the right spot on the board. Feed
the wire with your new 60 Hz square wave out of Tom’s PICDIV. The
“mods” should be very reversible and not a threat to the longevity of
the DCBI. 

Bob

> On Mar 5, 2018, at 9:17 AM, D. Resor <organlists at pacbell.net> wrote:
> 
> The unit has an external switching power supply which provides 5+ VDC.  In addition there is a 24VAC transformer which provides the power for the bell solenoids.  This where the AC reference is "sampled"  I cannot completely cut out the AC transformer as it is essential to other operations of the DCBI.
> 
> A lot to study.....
> 
> 
> Donald R. Resor Jr. T. W. & T. C. Svc. Co.
> http://hammondorganservice.com
> Hammond USA warranty service
> "Most people don’t have a sense of humor. They think they do, but they don’t." --Jonathan Winters
> 
> 
> 
> -----Original Message-----
> From: time-nuts <time-nuts-bounces at febo.com> On Behalf Of Tom Van Baak
> Sent: Sunday, March 04, 2018 3:02 PM
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Subject: Re: [time-nuts] WWV or Net Clock controlled oscillator
> 
> Donald,
> 
> Possible solutions to your 60 Hz mains problem:
> 
> 1) If you don't want to open or hack the clock controller in any way consider using a "online" UPS. Typically the synthesized 60 Hz AC output is quartz controlled.
> 
> 2) Make your own low-power 60 Hz AC/DC/AC power supply -- using a quartz, or ovenized quartz, or GPSDO or NTP-based timebase. How many watts do you need? How many seconds per week is your limit?
> 
> 3) Open the clock controller and locate the wire that gets the 60 Hz timing; probably from a low voltage winding of the transformer. Then cut the wire and feed your own precise digital 60 Hz instead.
> 
> 4) You mentioned "the 60Hz reference can be switched out". In that case what is the time source? What frequency? Based on a cheap quartz xtal? If so, perhaps it's easier to replace that instead of messing with 60 Hz.
> 
>> I was trying to locate a cost effective clock reference which can be 
>> synchronized from either WWV, request the correct time from a net 
>> server or possibly GPS.  It then needs a clock referenced output of 60Hz.
> 
> Can you be more specific about this requirement? Generating a precise 60 Hz is a different problem from knowing what the current local date / time is.
> 
> /tvb
> 
> ----- Original Message -----
> From: "D. Resor" <organlists at pacbell.net>
> To: "Time Nuts List" <time-nuts at febo.com>
> Sent: Sunday, March 04, 2018 2:30 AM
> Subject: [time-nuts] WWV or Net Clock controlled oscillator
> 
> 
>> Hello,
>> 
>> 
>> 
>> My first post here. I found this group's user group page while researching a
>> source for either a WWV, GPS or Network referenced oscillator.
>> 
>> 
>> 
>> The devices/equipment which I was able to find didn't  seem to fit the
>> requirements.
>> 
>> 
>> 
>> What I have is a Maas-Rowe DCB1 (Digital Chronobell Series 1) clock
>> controller.  
>> 
>> Seen here:
>> http://hammondorganservice.com/downloads/images/carillon/TempleCitySDADCB1a.
>> jpg
>> 
>> 
>> 
>> The system can be heard playing the Westminster Chimes and striking 12 noon
>> here:
>> 
>> 
>> 
>> https://www.youtube.com/watch?v=Ij5c6RqGhn0
>> 
>> 
>> 
>> 
>> 
>> It can be programmed to play Westminster sequences and/or music selections
>> using Maas-Rowe real struck chromatically tuned bell rods.
>> 
>> 
>> 
>> This unit is installed in Southern California Edison area.  The problem is,
>> this unit receives its clock reference from the 60Hz AC line to keep it in
>> sync.  Up until a few years ago this worked very well.  Now, Edison's 60Hz
>> line frequency is all over the place and this clock unit now gains 30
>> seconds and/or more a week which makes it difficult to keep it synchronized.
>> 
>> 
>> 
>> The 60Hz reference can be switched out by the use of dip switches, however
>> that setting isn't much better.
>> 
>> 
>> 
>> I was trying to locate a cost effective clock reference which can be
>> synchronized from either WWV, request the correct time from a net server or
>> possibly GPS.  It then needs a clock referenced output of 60Hz.
>> 
>> 
>> 
>> Does such a thing exist?
>> 
>> 
>> 
>> Thank You
>> 
>> 
>> 
>> 
>> 
>> Donald R. Resor Jr. T. W. & T. C. Svc. Co.
>> 
>> http://hammondorganservice.com
>> Hammond USA warranty service
>> "Most people don't have a sense of humor. They think they do, but they
>> don't." --Jonathan Winters
>> 
>> 
>> 
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