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single pulse input, permanent dc output ? Answered

I need to glow a LED permanently on 5v single pulse as input  till it is reset manually, what circuit should i use? For project work? Please help.

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Josehf Murchison
Josehf Murchison

5 years ago

Are you talking a oneshot turns on the LED and then when you hit the button again turns off the LED.

That is a oneshot circuit to flip flop circuit.

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AjayG28
AjayG28

Answer 5 years ago

Can you pls send me a link how to implement it or a IC for that. Thanks

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Downunder35m
Downunder35m

Answer 5 years ago

Here you can find all the info you need.

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-max-
-max-

Answer 5 years ago

You could use something as simple as a relay with 2 normally open contacts. Connect one side of the relay coil to power, the other side to one of the normally open contacts, and the other side of that contact to ground. Normally the relay will not be energized until you temporarily connect the one side of the relay coil to ground. Within a few milliseconds the contact will be closed. and you can remove that temporary ground connection to the coil, as the circuit will remain latched until power is removed.

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You could easily use an SCR (Silicon Controlled Rectifier) to do this job. When latched they act like diodes. Forward bias them, and temporarily energize the gate with a small current and boom. The SCR will start acting like a diode conducting current, even after you disconnect the gate. It will remain on and latched until no current is flowing anymore though the SCR & load.

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a 555 timer also has a flop flop latch built into it.I think you can use this as well.

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Logic gates can also be used. That is by far the most common depiction of an electronic latch online.

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The link I gave you shows many schematics for latches using transistors and MOSFETs. They to can be wired in a very similar way to the electromechanical way I described first, to do the same thing.

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AjayG28
AjayG28

Answer 4 years ago

thanks a lot max. That was very helpful.

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AjayG28
AjayG28

Answer 5 years ago

Thank u so much.

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iceng
iceng

Answer 4 years ago

+1