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high pulse delay circuit with transistor

Rggmiranda

Mar 1, 2014
6
Joined
Mar 1, 2014
Messages
6
Hi everyone, i need to turn on something if a signal is HIGH for a certain period of time, and turn it off afterwards, basically, if the input is HIGH for 10 seconds it triggers and the transistor or relay in the output closes, after the signal goes LOW it shuts down, I've been trying with caps and resistors charge delay but it gets tricky with the discharge, im not sure that is the correct way, any ideas? Thanks
 

Wesley Weaver

Apr 15, 2015
6
Joined
Apr 15, 2015
Messages
6
you'd have to post what you're working with already for us to see what you're talking about
 

Rggmiranda

Mar 1, 2014
6
Joined
Mar 1, 2014
Messages
6
That would be a brief example, i would like to charge the cap until it reaches the minimum voltage to drive the transistor, and by doing that generwting the delay
 
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