hi,
i have come across this circuit of normally closed 555, but i am not sure on how to select the components for the pin 2.
i would like to have normally closed 555. my circuit should give me a 1 sec output pulse when i open the switch.
i know that i have to select the value of what value of 100k, 10k and 1 micro capacitor such that their time constant is much less than the control R and C at pin 6. but am confused about the actual values....should i select for 100k, 10k and 1 micro capacitor so that they dont control the timer.
i have come across this circuit of normally closed 555, but i am not sure on how to select the components for the pin 2.
i would like to have normally closed 555. my circuit should give me a 1 sec output pulse when i open the switch.
i know that i have to select the value of what value of 100k, 10k and 1 micro capacitor such that their time constant is much less than the control R and C at pin 6. but am confused about the actual values....should i select for 100k, 10k and 1 micro capacitor so that they dont control the timer.
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