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Erm....I need a little help with some Electronics coursework.

Does anyone know how to make a device that times for Y amount of time then makes the buzzer sound off after that time for about 5 seconds. The only Chip I'm allowed to use is a 555 timer. Any help is appreciated.

Here is an example:


__________+vs
|
resistor
|
------- Output
|
capacitor
|
_________0vs

It should work, i am your teacher.

Thanks for trying to help.

It doesn't work.
Just let this topic sink, I'll ask my teacher on Monday.

Then you will need a capacitor and resistor in a potential devider. Using R * C to work out the time it takes before it turns on.

No chips involved.

H²O wrote:
> You want a 555 monostable circuit.
>
> Work out the time period using 1.1 * R * C (R being the resistor
> ohmage and C being the capacitors farods)
>
> If you want it to repeat this, try an astable.

I want the buzzer to sound off after the time has passed.

Buck1 wrote:
> Search the web
>
> The 555 one is about a second


What the fu** are you on about?

You want a 555 monostable circuit.

Work out the time period using 1.1 * R * C (R being the resistor ohmage and C being the capacitors farods)

If you want it to repeat this, try an astable.

Cheers Paradox

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