: Saturday, September 21, 2013 9:24 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Bob,
I would bump that base resistor up a lot higher, to load the FE-5680 less.
The PN has enough gain it only needs about 0.3 mA base drive to work as
intended. You'd get that with a 10K
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Hi
If you trace out the chip that drives the lock indicator it's got some sort of
strange gating in it's supply pin. That gets you even less output than you
would expect from a CMOS gate. I would not count on it putting out more than 1
ma at 5
li...@rtty.us
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, September 22, 2013 6:31 AM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Hi
If you trace out the chip that drives the lock indicator it's got some sort
of strange gating
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Hi
Circuit should be:
2N with emitter to ground, collector to LED, base to lock indicator via
the 4.7K resistor. The LED is hooked to +15 via another resistor.
If you have ~ 10 ma in the LED then the base needs less than 0.1 ma to do
, September 22, 2013 12:12 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Hi
Circuit should be:
2N with emitter to ground, collector to LED, base to lock indicator via
the 4.7K resistor. The LED is hooked to +15 via another resistor.
If you have ~ 10 ma in the LED then the base needs
.
From: Bob Stewart b...@evoria.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, September 22, 2013 12:27 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Except that it doesn't work with even 1500 ohms in the base lead
...@febo.com] On
Behalf Of Bob Camp
Sent: 22 September 2013 18:53
To: Bob Stewart; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Hi
If you want 10 ma through the LED (which should be plenty) then the
collector resistor would
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com; 'Bob Stewart' b...@evoria.net
Sent: Sunday, September 22, 2013 2:06 PM
Subject: RE: [time-nuts] FE-5680A Loop Lock Indicator
I have a circuit that seems to work well:
The lock indicator is a weak source but a good sink so
I'm surprised no one suggested using two 2N's in Darlington. Then a
22K or more from the base to the indicator pin would not load things down
much. Collector load then 1.2K to 2k in series with the LED.
Al, K9SI
___
time-nuts mailing list --
Hi Al,
This is just something quick and dirty. At least it works and doesn't seem to
be able to hurt anything.
Bob
From: Al Wolfe alw.k...@gmail.com
To: time-nuts@febo.com
Sent: Sunday, September 22, 2013 6:43 PM
Subject: Re: [time-nuts] FE-5680A Loop
From: Al Wolfe alw.k...@gmail.com
To: time-nuts@febo.com
Sent: Sunday, September 22, 2013 6:43 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
I'm surprised no one suggested using two 2N's in Darlington. Then a 22K
or more from the base
/dokuwiki/doku.php?id=precision_timing:fe5680a_faq
if you have not already seen it.
Angus.
From: Bob Stewart
To: Time Nuts
Sent: September 22, 2013 10:12 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
I hadn't thought of using a pullup resistor. I'd have to get out the
calculator
The instructions I got with this Rb said that you could hook an LED through a
5-10K resistor to the +15 supply and get a lock indication. I'm using a 10K
resistor and the LED lights as soon as it's powered up from cold. Is the loop
lock indicator circuit broken or is it just another strange
--
From: Bob Stewart b...@evoria.net
Sent: Saturday, September 21, 2013 10:55 AM
To: Bob Stewart b...@evoria.net; Discussion of precise time and
frequency measurement time-nuts@febo.com
Subject: [time-nuts] FE-5680A Loop Lock Indicator
The instructions I got with this Rb
From: jmfranke jmfra...@cox.net
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Saturday, September 21, 2013 10:45 AM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Are you applying +5V to pin as well? See:
http
If the lock output comes from the micro or a logic port with a maximum
output of 3.3 or 5V, a LED connected to it from +15 will be always ON.
On Sat, Sep 21, 2013 at 4:55 PM, Bob Stewart b...@evoria.net wrote:
The instructions I got with this Rb said that you could hook an LED through a
5-10K
of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
If the lock output comes from the micro or a logic port with a maximum output
of 3.3 or 5V, a LED connected to it from +15 will be always ON.
On Sat, Sep 21, 2013 at 4:55 PM, Bob Stewart b...@evoria.net wrote
Hi
As far as I know the lock output is a CMOS output that will drive a couple of
ma. There are so many variations that yours may indeed be an open collector and
good to +15 volts.
Bob
On Sep 21, 2013, at 10:55 AM, Bob Stewart b...@evoria.net wrote:
The instructions I got with this Rb said
measurement time-nuts@febo.com
Sent: Saturday, September 21, 2013 3:00 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Hi
As far as I know the lock output is a CMOS output that will drive a couple of
ma. There are so many variations that yours may indeed be an open collector
and good
: [time-nuts] FE-5680A Loop Lock Indicator
Hi
As far as I know the lock output is a CMOS output that will drive a couple
of ma. There are so many variations that yours may indeed be an open
collector and good to +15 volts.
Bob
On Sep 21, 2013, at 10:55 AM, Bob Stewart b...@evoria.net
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Saturday, September 21, 2013 4:12 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Hi
Those readings sound a lot more like a CMOS gate
...@evoria.net
Sent: Saturday, September 21, 2013 6:10 PM
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Hi Bob,
I hooked the big voltmeter up to it, and it shows +4.2V out for about a
minute, and then goes to 0. Looking
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Yes, but put an isolation resistor between the output and the base of the
transistor, something between 3K and 5K should work. The LED will light upon
power on and extinguish when lock is achieved.
John WA4WDL
...@evoria.net
To: Time Nuts time-nuts@febo.com
Sent: Saturday, September 21, 2013 10:02 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Hi John,
Thanks for the response. I managed to cobble something up with LTSpiceIV, and
get it to work. And for me, that's saying something! Here's what I
From: Robert LaJeunesse rlajeune...@sbcglobal.net
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Saturday, September 21, 2013 9:24 PM
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
Bob
b...@evoria.net said:
Is 3ma really that big a deal? I know squat about CMOS gates. I guess it
is pulling the voltage down by 25%, though.
There should be something in the data sheet. 1/2 :)
If you trace the signal back the next time you have it open, you might be
able to figure out
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