Pulse generator

[ArivNidunami]

Hello, there are an IC (or circuit) that make a simple pulse generator?
Actually for a buzzer, i want to make it beep twice then delay.. or beep three times then delay, as shown below.
Thanks for responding.

 

[Reloadron]

There are a few ways to go about it. Using discrete components a One Shot multi-vibrator driving (gating) an astable multi-vibrator comes to mind with other solutions. Another single chip solution might be a uC (micro-controller) programmed to on trigger output a given umber of pulses over a given period of time. Using a uC is likely the simple way to go.

You make no mention of how you want to trigger things (get things started) or if you want it to repeat or happen once per trigger? Nor do you mention timing?

Ron

 

[AnalogKid]

Two properly tuned 555's can do this, with one output driving the other Reset input.

OR one CD4060 plus an output transistor. More consistent output pulse widths, only one timing circuit.

Buzzer voltage? current? part number?

ak

 

[Reloadron]

Two properly tuned 555's can do this, with one output driving the other Reset input.

Or a single 556.

Ron

 

[gophert]

Or a single 556.

Ron

i think a push button would require a 555 and a 556 (or three 555).
- mono-shot to turn pull two out of reset mode for 3-seconds
- a beeper 555 running at 1Hz in astable mode
- the tone signal 150 to 500 Hz

Of course, there are other ways but it is probably a good idea to have a discrete number of beeps.
Also, the on-time of the first beep will be a bit longer than the rest with my circuit but not likely too noticeable.

something like this...

 

[Reloadron]

Or a count to N and halt driven by a multi-vibrator. Thinking it can be done any number of ways. Once the thread starter comes along with some answers maybe things will get simpler... or more complex.

Ron

 

[gophert]

Unless there is already a buzzer instead of a speaker to make the tone, then the last of the 555 can be eliminated.