555 Delay Power Off

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coryfoss

Joined Jun 17, 2011
12
I found this schematic online and figured it would work perfect for my application. I am running a circuit with a 9V and after a set amount of time the circuit and current load on the battery will be disconnected. I breadboarded this circuit exactly as shown, but the load would never disconnect. It was on as soon as the 9V was connected without pressing S1. Did I do something wrong. According to what I read it should work as follows.

S1 is closed; circuit powers up and supplies power to load.
S1 is open: 555 starts timing based on RC combo
At the end of the delay power to load and battery is removed.

Any info would be appreciated.
 

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#12

Joined Nov 30, 2010
18,224
You have the same post in "chat" This is a no-no.
The bosses will soon eliminate one of them.
Just so you know what's happening.
 
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