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 Calculation help please.

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T O P I C    R E V I E W
Doogsman Posted - Nov 21 2011 : 6:50:31 PM
Hi all. I have been trying to figure out a time delay using a 4011 IC using the equation supplied on this site with the circuit also. When using the equation R1*C1*0.85=T for a 20 second Time and 5K Ohm pot as R1 I am getting 4.7pF but it is not working. Can someone please double check my calcs for the value of C1. Any help would be greatly appreciated.
Cheers
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audioguru Posted - Nov 21 2011 : 10:52:35 PM
4.7pF is almost nothing. Try 4700uF x 5k = 23.5 seconds x 0.85= 19.98 seconds.
Or 470uF with 50k ohms.
Or 47uF with 500k ohms.
Or 4.7uF with 5M.

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