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Ajith Gopi

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I'm new to electronics and I wanna make a circuit that will start continues connection to another circuit on pulse.

In long,
If the current circuit gets a pulse, an led (suppose) will glow and will not turn off until the battery is disconnected. I'm planning to make a laser-ldr alarm and don't want to turn off the alarm once it has been triggered. It would be great if the circuit is simple and not so costly.

In short,
A circuit that will keep the connection on once activated.

Thank you.
 
Hello Ajith Gopi, welcome to ETO!

The simplest (reliable) option I can think of is a 555 timer in bistable mode:

 
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