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50hz clock ** Update **

T

tom314

Member
I would like to create a 50hz ttl clock, but I am unsure of the best way to do it. I was thinking of using a 555 timer, but it can be difficult to get a 50% duty cyle using the 555 timers. I was then thinking about a crystal oscillator, but it looks like they are for much higher frequencies. Are there any other options, or do I just have to make due with the 555 timer?

** Update **
Ok, I finished building my design and it is currently running off of a 9v battery. Is it possible to use a dc power supply that plugs into the wall that supplies 9v, and 1.5A instead? I am worried that the current will be way to much for my circuit. I know for a fact that my voltage regulator only handles up to an amp. So I guess my question is will the supply output1.5 amps to my circuit, or will my circuit just draw the neccesary amount of current to run.
 
Crystal oscillator and binary divider

Use a 3.27680 MHz crystal and a 16 bit divider.

That crystal frequency looks odd, but is a standard value - it was specifically chosen for 50 Hz clocks.
 
how do you hook up crystal oscillators? ive looked everywhere, but i cant find instructions on how to actually use it in a circuit.
 
Originally posted by: Mark R
Crystal oscillator and binary divider

Use a 3.27680 MHz crystal and a 16 bit divider.

That crystal frequency looks odd, but is a standard value - it was specifically chosen for 50 Hz clocks.
Click to expand...
i'd go with this one.. it's the simplest and most accurate. if you want a more configurable (and a hell of a lot more complex) method then u can look into using a pll.
 
You can power your circuit from a 9 volt wall wart supply. The current rating only has to be comfortably more than your circuit uses. The circuit will just draw what it needs - not the whole 1.5 A.

Sometimes those power supplies produce DC that's not real clean, and this can cause trouble but it probably won't.

You are using a DC supply - not AC - right?
 
Yeah, this is a DC supply and it is going through a voltage regulator to the rest of my circuit so hopefully it will be okay. I guess I will have to test it to make sure it still works with the supply, I was just worried that it would burn up the IC's in my design so I was a little afraid of trying without hearing some kind of confirmation. Thanks for the reply.
 
Just take into account that the voltage rating can be deceiving - your DC supply might generate 9V for a load of 0.1 to 1.3A, and 10V for a load of 0A, and 8V for a load of 1.5 A. Make sure your circuit is able to withstand the "9V" voltage you read with the DC power supply turned on and no load
 
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