[sdiy] Monostable questions

[Synovatron]

As Veronica says, a 556 dual timer. Your requirement is for a standard pulse generator i.e. two timing functions: a delay timer that triggers a pulse width timer.

The 556 is falling edge triggered so you may need a logic inversion first. The input falling edge triggers the first timer which produces a positive pulse. When that times out its falling edge triggers the second timer which produces the pulse you require. 

Cheers
Tony 

Sent from my iPhone

On 30 Jul 2012, at 06:20, Veronica Merryfield <veronica at merryfield.ca> wrote:

> 556
> 
> On 2012-07-29, at 8:59 PM, dan snazelle wrote:
> 
>> I was wondering if anyone had experience with a  chip that meets these requirements.
>> 
>> (the 4098 sort of can if you use both sections in tandem but it doesnt do quite what i want.
>> 
>> 
>> is there any chip out there that  receives a pulse then puts out a brief pulse a set duration later....the duration can range from short to very long
>> 
>> 
>> the 4098 does something different....instead of the RC time constant determining the length of the delay, it determines the length of the ON TIME
>> 
>> I am looking for something that has a Brief On Time but you can change the length of the delay between pauses.
>> 
>> 
>> maybe such a chip does not exist and I just need to use two monostables...one triggering the other.
>> 
>> 
>> thanks for any help!
>> 
>> 
>> 
>> 
>> 
>> 
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