Delayed Start Circuit using 555 IC

Posted by Rohan on Monday, July 28, 2014 with No comments
This circuit does not turn on for XX seconds after power is applied. Adjustable from 1 second to 2 minutes.The delay can be adjusted by changing the resistance between pin 6 and ground.
Either you can use a 1M Variable Resistor or use different resistances to get different delays in turning on the circuit. Just Connect a LED to pin 3 of 555 along with a resistor to delay the start of LED.

Resistances Between pin 6 and Ground and their Respective Delays :

1K-     1s
100k-  10s
220k-  25s
250k-  27s
500k-  56s
1M-   2min


COMPONENTS USED :

1.one 555 IC.
2.one 100uF Electrolytic Capacitor.
3.one 1M Variable resistor or different Resistances (1K,100K,250K etc)
4.one LED.
5.one 470ohm/220ohm resistance.
6.one 9-12V Power Supply.




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