Author Topic: Atomic Clock / Frequency Counter Project :)  (Read 1939 times)

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Offline @rt

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Atomic Clock / Frequency Counter Project :)
« on: January 05, 2015, 09:04:48 am »
Hi Guys :)

Greetings from Australia... first post!
I have been watching Dave’s YouTube channel for a while, and in one of the videos where he wasn’t breaking irreplaceable vintage stuff,
he demonstrated one of the used rubidium frequency standards available on eBay, and in another, gave a pretty good explaination of
it's inner workings. Then of course he wrecked it.

So it was these videos that convinced me to buy one, and lucky I got a good one that locks fast, so I went ahead and made a real time talking clock
and frequency counter. The frequency counter part and it’s gate timer is done with old school logic ICs, even though the reference is derived from hardware PWM from the micro controller, in turn clocked with the rubidium. If you look closely the seven segment displays use
five frames of animation to give a mechanical rolling odometer effect, and I wrote a DTMF iPhone App to control it.
It was featured on Hack-A-Day, but way before it was done. Also, it’s still not done :D It would take a GPS module to set it properly.
Cheers, Art.

DTMF input:


10 MHz test:


« Last Edit: January 05, 2015, 09:09:19 am by @rt »
 

Online PA0PBZ

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Re: Atomic Clock / Frequency Counter Project :)
« Reply #1 on: January 05, 2015, 03:27:44 pm »
Then of course he wrecked it.

That's not wrecking, this is wrecking:
 


 :-+
Keyboard error: Press F1 to continue.
 

Offline Alex30

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Re: Atomic Clock / Frequency Counter Project :)
« Reply #2 on: January 05, 2015, 04:09:31 pm »
Nice assembly! Could belong in a sci fi movie, seriously. Good work
 


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