On Wed, Mar 23, 2011 at 4:23 PM, Bob Camp wrote:
> Hi
We're only driving a motor here, low distortion is hardly a requirement.
You mean this is for a mechanical clock? Then telk of a 512K LUT is
pointless. You need only 8-bit samples and to shore 90 degrees of the
sine function takes 64 bytes.
Hi
You can do the drop / add pulse thing with a sub 50 cent micro. The only real
sorting function is that you rule out the ones that won't take an external 10
MHz clock. If you want pseudo sine wave with PWM that likely will fit. We're
only driving a motor here, low distortion is hardly a requ
On Wed, Mar 23, 2011 at 3:18 PM, Mark Sims wrote:
>
>> it doesn't have to be THAT complex. A 50 entry LUT is however expensive.
> Yeah, might even cost as much as a whole US dollar (ragged as they are these
> days). 512 kbyte EPROMs can be had for under $1... connect the outputs to a
> re
> it doesn't have to be THAT complex. A 50 entry LUT is however expensive.
Yeah, might even cost as much as a whole US dollar (ragged as they are these
days). 512 kbyte EPROMs can be had for under $1... connect the outputs to a
resistor ladder (might need an output latch), filter, voila
On 03/10/2011 11:41 PM, Robert LaJeunesse wrote:
Poor man's solution: Use an Arduino to read the Thunderbolt 1PPS and lock a 50Hz
(or 60Hz) square wave to the 1PPS. Any resulting jitter can likely be kept in
Here is an even poorer man's solution (and plug):
A DDS using both compare outputs of
Just thinking here about making a 60M0 Hz oscillator and
phase locking it to the 10M0 reference. Then divide the
60M0 by 1e6. Youve got a perfectly locked 60 Hz square
wave.
For low harmonic 60 Hz sine wave one can go for 480 Hz
to start a Walsh -Hadamard converter. Take 60M0 divide
by 125 (easy
On 03/22/2011 11:45 PM, Hal Murray wrote:
mag...@rubidium.dyndns.org said:
On the other hand, it would not be difficult to make a DDS which hit 60/
1000 exactly. Reducing it by 20 on each side you get 3/50 so a 19
bit accumulator (mod 50) incrementing with 3 on every 100 ns perio
mag...@rubidium.dyndns.org said:
> On the other hand, it would not be difficult to make a DDS which hit 60/
> 1000 exactly. Reducing it by 20 on each side you get 3/50 so a 19
> bit accumulator (mod 50) incrementing with 3 on every 100 ns period
> would do it.
Neat. Thanks.
I'd n
50 duty cycle to keep a motor running at the right
>>> speed.
>>>
>>> -- Flemming Larsen, KB6ADS/OZ6OI, Berkeley, CA, USA
>>>
>>> Disclaimer: This method has not been tested, and is not endorsed by any
>>> rocket scientist. Use with cautio
right
speed.
-- Flemming Larsen, KB6ADS/OZ6OI, Berkeley, CA, USA
Disclaimer: This method has not been tested, and is not endorsed by any
rocket scientist. Use with caution, and always be sure to wear proper
eye-protection.
--- Den søn 20/3/11 skrev WB6BNQ:
Fra: WB6BNQ
Emne: Re: [time-nuts] 50/60
always be sure to wear proper
> eye-protection.
> --- Den søn 20/3/11 skrev WB6BNQ :
>
>> Fra: WB6BNQ
>> Emne: Re: [time-nuts] 50/60 Hz clocks
>> Til: "Discussion of precise time and frequency measurement"
>>
>> Dato: søndag 20. marts 2011
ne: Re: [time-nuts] 50/60 Hz clocks
> Til: "Discussion of precise time and frequency measurement"
>
> Dato: søndag 20. marts 2011 19.40
> Paul,
>
> Even the low end regular DDS, like the 9831, using a 10 MHz
> striaght through clock
> will produce a fr
Like the tool. Thats sure makes things easy.
I see the 9831 is about $11 which is a great price. However the many pin
tsop even with an adapter will be a sun of gun to solder. I will be on the
hunt at the sping fleas for some smaller irons.
Regards
Paul.
On Sun, Mar 20, 2011 at 10:47 PM, paul swed
Thanks Bill parts is parts.
Do like the ad5329 and its working well. Have 5 of them now. About the
hardest thing is soldering the devils to a breakout board and not bridging
pins.
But I am sure other parts will work as fine. Indeed those are some very fine
outputs.
Regards
Paul.
On Sun, Mar 20, 20
Paul,
Even the low end regular DDS, like the 9831, using a 10 MHz striaght through
clock
will produce a frequency of 60.0004568696022 Hz or 50.0003807246685 Hz as
an
output. Simple (ok, perhaps not) amplification after that will get the clock
drive needed. Just because some of Analog Dev
Speaking of dds the ad5932 can do this also 10 MC in and 60.20069122 out
Change 1 bit and you get 59.6046448 it would be quite easy to bounce back
and fourth between the two frequencies like the power company does over
time. Thats a small 16 pin chip for a few $. Plus a small pic to make it do
what
On 03/21/2011 12:10 AM, Hal Murray wrote:
If the plan is to drive a mechanical clock, I assume long term stability is
more important than phase noise. Many small microcontrollers (I use 8051's
from Silabs) have a built-in PLL that can be set to run at 15 MHz from an
external 10 MHz reference (a
> If the plan is to drive a mechanical clock, I assume long term stability is
> more important than phase noise. Many small microcontrollers (I use 8051's
> from Silabs) have a built-in PLL that can be set to run at 15 MHz from an
> external 10 MHz reference (applied to the external oscillator inp
hings...
-Original Message-
From: Bruce Griffiths
Sender: time-nuts-boun...@febo.com
Date: Sun, 20 Mar 2011 09:30:03
To: Discussion of precise time and frequency measurement
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 50/60 Hz clocks
A
Hi
Lucent simply divided the 10 MHz by two and then tripled that in their standard
base station gear. Lots of ways to do it. None of them very hard at all.
Bob
On Mar 19, 2011, at 4:30 PM, Bruce Griffiths wrote:
> An OTT solution might employ a regenerative divider to generate a 15MHz
> sign
An OTT solution might employ a regenerative divider to generate a 15MHz
signal from a 10MHz input followed by a digital divide by 250,000 circuit.
One could employ an inexpensive Gilbert cell mixer in the regenerative
divider to keep the cost down.
Bruce
Bob Camp wrote:
Hi
Most likely the lo
Hi
Most likely the lowest parts count is to divide to a narrow(ish) 20 Hz square
wave and then drive a resonated transformer with a pulse. The output won't look
pretty, but it should drive a small clock motor just fine. Done properly, there
should be very little power involved.
If you are goi
Robert LaJeunesse wrote:
Poor man's solution: Use an Arduino to read the Thunderbolt 1PPS and lock a 50Hz
(or 60Hz) square wave to the 1PPS. Any resulting jitter can likely be kept in
the tens of microsecond range, easily filtered out by the clock mechanics.
Filter the square wave a bit and fee
Cezary Rozluski wrote:
Well – it is nice solution presented, but I would like ask you what
would be from time-nuts perspective simple (the simplest ?) solution
to drive such 50/60 Hz clocks without to much overweighed stuff (and
of course without modifying the clock itself addig e.g step motor
At 04:54 PM 3/10/2011, Cezary Rozluski wrote...
Let us suppose I have Thunderbolt (I really have one) as a
time/frequency source, but any other time-nuts recognized frequency
source should by sufficient for the fun to drive old 50/60Hz stuff
with the highest precision available (and for fun, c
float charger for uninterruptible timing.
good luck
Bob L.
From: Cezary Rozluski
To: time-nuts@febo.com
Sent: Thu, March 10, 2011 4:54:37 PM
Subject: [time-nuts] 50/60 Hz clocks
...
Let us suppose I have Thunderbolt (I really have one) as a time/frequency
source
Be it 50 or 60 Hertz clocks if you do not want to alter it you need to use a
DC to AC converter. Generally these things are inexpensive and used for cars
or computer UPS systems. Though some of these actually have a square wave
out. Not great for the little motors.
Internally you would need to get
The exclusive solution feasible is:
http://shop-emea.u-blox.com/abashop?s=274&p=productdetail&sku=553
Nice, as you can program it for PPS at 10KHz or some other frequency.
More cheap, not so spectacular:
Cirrus CS2000 PLL
Locks on 50Hz or more
- Henry
--
ehydra.dyndns.info
Cezary Rozluski sc
It perhaps the old story it is difficult for
non-continental Americans have opportunities to
buy valuable time-nuts equipment such as e.g.
Hewlett Packard Vintage Digital Clock Model 115BR-HO8 seen on ebay recently
To temporary cheer up (?) myself I found (and
bought) available on local (E
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