[time-nuts] Why are 1PPS signals so skinny?

[Tom Holmes]

The LED current could also be switched with a very long rise/fall time so
that there isn't any transient, in the abrupt sense of the word. Who's gonna
see the difference?

Tom Holmes, N8ZM
Tipp City, OH
EM79


> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Magnus Danielson
> Sent: Wednesday, May 16, 2012 10:57 AM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Why are 1PPS signals so skinny?
> 
> On 05/16/2012 02:21 PM, shalimr9 at gmail.com wrote:
> > It would be very easy to use a constant current to drive the LED and
simply
> short it periodically to provide the blinking without supply current
variations. You
> would still have short transients in the drive circuit, but these should
be much
> easier to filter.
> 
> Agreed. You could also have a pair of LEDs and alternate which of them is
lit.
> 
> Then, to reduce the impact on the PPS signals, the LED on/off could be
forced to
> be phase-shifted to the PPS.
> 
> Cheers,
> Magnus
> 
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