Wow. Talk about saving money :-)
I am amazed at the environmentally-friendly reuse I see on this list.
--
Sanjeev Gupta
+65 98551208
On Sat, Sep 27, 2008 at 5:33 AM, Mark Sims [EMAIL PROTECTED] wrote:
I found a nice wall clock that somebody had tossed in the trash because the
battery
I found a nice wall clock that somebody had tossed in the trash because the
battery leaked. Now to pimp it out time-nuts style:
1) Take 1 Tektronix AFG5101 Arbitrary Function Generator.
2) Configure (1) for external clock
3) Take one PTB-500 10 MHz Rubidium Frequency Standard.
4) Divide 10
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Didier Juges
Sent: Thursday, September 04, 2008 11:24 PM
To: 'Tom Van Baak'; 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Driving clocks from 1pps
Ah, I see now
Hi Murray:
When driving an inductive load the time constant is L/R. This is very
different than for a capacitive load where it's C*R. So for inductive loads
you want to use as large a series resistance as possible consistent with the
voltage of your power supply and the current needed by the
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Murray Greenman
Sent: Thursday, September 04, 2008 2:30 PM
To: time-nuts@febo.com
Subject: [time-nuts] Driving clocks from 1pps
In the light of the latest posts on driving clocks from 1pps, it sounds
Murray Greenman wrote:
In the light of the latest posts on driving clocks from 1pps, it sounds
as though I'd better rethink what I was planning!
I am in the middle of the design of a micro which uses a 10MHz crystal
to provide a digital clock, but the time is kept in line via GPS using a
Hi,
The motors in quartz clocks and watches (mainly) are driven by
alternating pulses about 20ms long at about 1.4 volts.
As has been mentioned this can be done with CMOS, connecting the coil
to two outputs and pulsing the outputs alternately.
However some of the movements are sensitive to
I am in the middle of the design of a micro which uses a 10MHz crystal
to provide a digital clock, but the time is kept in line via GPS using a
1pps NCO, which is steered digitally, rather than altering the 10MHz
oscillator in GPSDO fashion.
The plan was to provide two outputs (biphase) at
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Van Baak
Sent: Thursday, September 04, 2008 6:37 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Driving clocks from 1pps
I am in the middle of the design
Tom Van Baak wrote:
I am in the middle of the design of a micro which uses a 10MHz crystal
to provide a digital clock, but the time is kept in line via GPS using a
1pps NCO, which is steered digitally, rather than altering the 10MHz
oscillator in GPSDO fashion.
The plan was to provide two
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Tom Van Baak
Sent: Thursday, September 04, 2008 11:17 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Driving clocks from 1pps
50% duty cycle is way overkill
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