4047 Calculator

This tool helps calculate values for C & R for a CMOS 4047 in free running (astable mode). The beauty of this device is that it gives almost 50% duty cycle without any difficult calculations (unlike the 555).

Download the datasheet here

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Example: Using the above formula triangle and assuming we have a 50% duty cycle ie T(on)=T(off):

 For a T(on)(=T(off)) period of 0.1s then F=1/0.1=10Hz

For a F of 50Hz then T(on)(=T(off))=1/50=0.02s

Unfortunately I can only seem to get this webpage to run in IE - Sorry to all the FireFox users.