LED clock?

Question

I need to build a board with 7-segment LED clock (hh/mm/ss) it is veryimportantto have seconds and power suplay is 12V in carDoes anyone have a circuit for this?Thanks!

Rene Tschaggelar · Accepted Answer

A clock is a bad project as it will never besufficiently accurate.Rene-- Ing.Buero R.Tschaggelar -  commercial newsgroups - *** Free account sponsored by  ****** Encrypt your Internet usage with a free VPN account from ***

Spehro Pefhany · Answer

Guaranteed accuracy of a couple minutes a year should be achievableusing an off-the-shelf TCXO. Doing firmware compensation on a32.768kHz oscillator would be more fun, though.  Best regards, Spehro Pefhany-- "it's the network..."                          "The Journey is the reward"             Info for manufacturers:  software/hardware/analog  Info for designers:

Ken Taylor · Answer

Not accurate enough for what?For the OP, try Googling on 'led clock circuit', or just cruise over to:Cheers.Ken

Ken Taylor · Answer

Whoops, meant to mention - use the 12V supply instead of the transformer and IIRC (without checking....) there's a clock circuit for 50 or 60 Hz on that site as well.Ken

Spehro Pefhany · Answer

The availability of the 50Hz signal may be an issue in a car. Best regards, Spehro Pefhany-- "it's the network..."                          "The Journey is the reward"             Info for manufacturers:  software/hardware/analog  Info for designers:

Rene Tschaggelar · Answer

As clock. The only clock I can trust to have accurate time is my battery operated radiocontrolled one. Every other, be in the car or wherever is suddenly off by a minute or so and the railway or the bus is gone.

Rene

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hiroc · Answer

I need to adjust time!

Ken Taylor · Answer

And that should worry the OP (or anyone else) for what reason? Oddly enough, clocks other than your one special battery powered, 'radiocontrolled' one have worked just Jim-Dandy for a few years now.

'Suddenly' off by a minute sounds like operator error. Buses and trains running on time sounds like Nirvana. Or Elton John on a good day.

Ken

LED clock?

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