Designing a Frequency Meter

Is this to measure 1 to 5 Hz frequency or to generate it?

Also what accuracy do you need as well as display analogue or digital??

What is the signal required to be generated or measured? is it large or small voltage, sine, square, or pulse?

and so on... John.

Hohh thankx man this is to generate a frequency between 1 and 5Hz as digital square wave small voltage

Frequencymeter? Frequency generator? What wave form Variable or fixed? Logic level or ?

Yes man I'm talking about frequency generator that can generate me a frequency between 1 and 5Hz(variable).I need a square wave in digital logic.

thakx

You can generate pulse waves not square waves with the 555.

You can get a 50 percent duty cycle, if that's important: see

http://cr4.globalspec.com/thread/6358/555-timer-design, post #11

Yes but it is still only pos going pulses. 555 can not on it own give true rms square wave out.

There's quite a few here...

http://www.knightedu.com/products/labEqui/bench/gfg_3015.html

http://www.hpmemory.org/collection/sigsrc.htm

http://www.vigilante-electronics.com/

Or, you can goooo, down low...

http://www.electronickits.com/kit/complete/surface/ck1301.htm