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simple timer needed please help

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stephen-7486

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i need some help with with a timer circuit that will hold the output high for about 30 seconds when power is applied and then go low indefinetly until it is powered down and turned on again
 

sherazi

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you can use 555 in monostable mode, use the timing resistors to select 30s, when there is a signal on the input pin the output will be high for 30s and then low again until again gets a signal,
you can input a pulse and the circuit would output high for 30 secs

for the resistor and capacitor values for timing u can use the program available here


go through this it will help
 

kak111

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