circuit design 555

Ken
Ken's picture
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Joined: Dec 11, 2016
circuit design 555
December 11, 2016 - 10:15pm

This is what I need

When input voltage in applied, output in high.

When input voltage is removed, output is low,  and starts a time delay

that will not be affected by applying another input voltage, until the time delay

is finished. After the delay is finished, the cycle will repeat.

B.Aswinth Raj's picture
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Joined: Aug 16, 2016
Use 555 Timer in mono-stable mode
December 22, 2016 - 6:52am

Hi Ken,

I would suggest you to use a 555 timer in mono-stable mode for your application. In which you could calculate your time delay by using the formulae

T = 1.1 * R * C, Where R and C are the resistor and capacitor connected accross 8,7 and 6,Gnd respectively.

 

Refer: http://circuitdigest.com/electronic-circuits/555-timer-monostable-circui...

          http://circuitdigest.com/electronic-circuits/flashing-led-using-555-time...

 

You might wanna tweak the design a bit by using a NOT gate to inverse operation. If you get stuck somewhere let us know we will help you out.