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I need roughly 1Sec delay.
T=1.1*R*C
T=1.1*100K*470uF
T=52Sec
The problem is after triggered the output lamp never gets off
sometimes it gets off taking very long time.
How to avoid this & make a smooth run?
What sort of lamp is 20mA??Lamp is 20mA.
20 mA, I Presume your using an LED?
That is OK.
And a 120K resistor and a 470uF cap is 62 Seconds.
However, Electrolytic Caps usually have High Leakage, and that can result in it Not operating as expected.
Electrolytic caps also have Very Poor Tollerances.
So Electrolytic caps are typically + or - 20% of rated value. Sometimes even WORSE.
A Tantalum cap would be Better for tollerance and leakage.
So I would recomment a 1.2 Meg Resistor and a 47uf Tantalum.