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Circuit design Answered

Hi, I’m hoping someone could help me. I’m looking to design a circuit for a college project that controls a 240v light. The circuit and light will be controlled by a switch however when the switch is first turned on the light needs to remain off (no power supplied) regardless of the amount of time the switch is on. If however the switch was turned on off and on again then the light needs to come on. Any ideas of a circuit and components required to produce something like this? Your help is greatly appreciated.

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YADUKRISHNAN K M

2 months ago

Only need 2 T-flip flop ,1 transistor,1 relay, resistor and capacitor.
T flipflops data input connect to +vcc and it's clk is connected to the push switch. 1st flip flop output connected to 2nd flip flop clk. Its output connect to transistor to drive the relay and relay drive the AC lamp. This circut reduce the clock frequency by 4. I beleved that your requirement is this. Ok.

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adhith94

2 months ago

as rickharris said "There has to be more to the specification than this", maybe if you could explain why do you want to control a switch in this way ie. the aim of your project then, you could probably get a proper solution for this.

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rickharris

2 months ago

You don't say when you want the light to go off - If you want it to go off when you flip the switch again then all you are doing is reversing the switch operation.

There has to be more to the specification than this. Tell us.

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Downunder35m

2 months ago

A counter IC, two flip-flops, a few resitors, or go overboard and use a microcontroller.
You can even go old school with relays
One timer relay set to one or two seconds and self locking so the timer keeps running.
One contact is in series with the second relay and the switch.
So only while the timer relay is on a flick of the switch will power the second relay.
If in doubt add one more relay so you can turn the lights off too.

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randofo

2 months ago

You need a solid state relay "puck relay" that is 5V DC on the control side, and 240V AC on the load side.

To learn about controlling 240V light bulbs with an Arduino, check out the light bulb lesson in my LED and Lighting class:
https://www.instructables.com/lesson/Light-Bulbs/