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-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On > Behalf Of Magnus Danielson > Sent: Wednesday, May 16, 2012 10:57 AM > To: time-nuts@febo.com > Subject: Re: [time-nuts] Why are 1PPS signals so skinny? > > On 05/16/2012 02:21 PM, shali...@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
