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Topic: Crystal Driver Circuits (Read 912 times) previous topic - next topic

baum

I have another question in my pursuit of happiness creating a 74 logic series clock.
anyway, I am using a 1Hz clock to drive the clock... but obviously 1Hz crystals are not sold. So I am using a 65.536kHz crystal and dividing it down, but can someone help me with driving the crystal? I can't find any solid explanations and/or circuits. btw I am not using a micro... just passives and 74 series ICs. I don't need EXTREME accuracy, preferably a simple and easy to build driver circuit.

Thanks a bunch!
baum

BjornTore

You can use a standard Arduino UNO and load the basic beginner scetch called "Blink". Then you can correct the ON-time to 500ms and the OFF-time to 500ms. The whole cyclus will be 1sec. This is 1Hz.
Cost you about USD20. You will need a 5-12VDC (0.2A) powersupply also. (And purhaps a 817C optocoupler. And maby a BC-337 transistor + 22Ohm resistor).
BjornTore

Grumpy_Mike

What is wrong with this one, google second hit:-
http://www.electronicecircuits.com/electronic-circuits/ttl-crystal-oscillator-schematic

Quote
So I am using a 65.536kHz

Why so very high? There is no need.

HugoPT

#3
Jun 14, 2012, 06:48 pm Last Edit: Jun 14, 2012, 06:50 pm by HugoPT Reason: 1
You can also use the old 555 to get 1Hz I belive
See this schematic http://electroschematics.com/4843/1-hz-pulse-generator/
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winner10920

555 would probably be easiest, and easiest to adjust
Otherwise with a crystal that would be alot more hardware, and u need an oscillator for the crystal, so isn't effectively any better

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