How to setup the values of R1, R2 to hold a high output 30 seconds for a 555 monostable?

wayneh

Joined Sep 9, 2010
16,102
I see two circuits in that older thread. Which one are we talking about here?

You could increase C1 or one of the timing resistors.
 

dl324

Joined Mar 30, 2015
8,890
What has to be changed to increase the variable time the relay is energised up to 30 seconds?
30 seconds is a long time for a 555 timer if you need it to be accurate, but you can use this graph:
555delayGraph.jpg
 

Alec_t

Joined Sep 17, 2013
10,359
The capacitor needs to have a very low leakage to achieve a delay time that long.
 
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