Time Delay Relay II by IC 4011

When activated by pressing a button, this time delay relay will activate a load after a specified amount of time. This time is adjustable to whatever you want simply by changing the value of a resistor and/or capacitor. The current capacity of the circuit is only limited by what kind of relay you decide to use.
Source:http://www.aaroncake.net/circuits/relaytim2.htm

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