How to make a simple square wave generator (10 HZ to 100 HZ)

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to be EXACT, the equation for the amended 555 timer should be:

T=In(4)RC
F=1/In(4)RC

I just like to be exact
 

Hi, is there any way to do the same (similiar) thing by using crytals. Thats, a variable frequency output for example between 1-10 kHz aquare wave generator.
 

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