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time clock

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gogo01

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:?:
I need information on a time clock. this clock has three circular rows of leds. The inner row (12) leds indicates the hour, the next row is the minutes and the outer row is seconds. The clock also has leds that light back and forct to simulate a pendulum. The cluck also plays the west minister chimes.

Looking for any help, schematics, circuit layout, IC chips and etc.

thanks for any replies
 

Klaus

New Member
Ha, I built something like that 25 years ago and it is still going.
I used only two concentric LED rings, the outer, 12 led, ring indicated the hours, the inner, 60 led, ring the minutes and seconds. The minute is illuminated by a single led and the second has a 'comet tail' that overtakes the minute - neat to watch.
I never bothered with the pendulum display.
My first clock used TTL chips and was a bit power hungry (for the standby battery), the second version used C-mos chips and the larger, 5mm LED's and used only 1/10th of the power.

I built these for the challenge in doing the artwork of the circular PC boards for them, the TTL version uses 6 stacked boards,of about 100 mm diameter. The C-mos version uses two boards of about 150 mm diameter.

Have fun, the circuit is easy, the boards are the hard part :wink:
Klaus
 
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