[sdiy] Varying gate lengths (using a 4017 counter) for a simple sequencer?

[Harry Bissell Jr]

You are asking for a monostable multivibrator circuit.

These are common and you can find examples on the web.
They come in retriggerable and NON-retriggerable
varieties.

retriggerable would (if you extend the pulse length
longer than the whole sequence time) have an output
that stays high forever.

non retriggerable would time out, then reset and
trigger again on the next pulse.

The 555 timer would be one obvious choice for this
application, there are many

H^) harry

BTW... do this, and your "simple" sequencer will no
longer be simple


--- Julian <julian at 22host24.com> wrote:

> Hi there,
> 
> I'm messing with a 4017 decade counter, as a simple
> sequencer.
> 
> Is there a simple way to take the regularly spaced
> outputs (gates) from
> this, and vary the length of them - i.e.. both make
> them shorter then they
> actually are, and longer then they actually are?
> 
> 
> Basically what I'm thinking is a simple sequencer,
> like the one mentioned in
> the 'simple sequencer' thread earlier, but with
> control over the gate times
> too.
> 
> Ken stone's project using this chip offers a
> solution using switches to swap
> between the gate signal and a set, shorter, pulse,
> but what id really like
> is a completely variable time that can also be
> different for each step,
> ideally being able to even have overlapping gates
> (i.e.. longer then one
> clock cycle) although, i guess this isn't nearly as
> important as being able
> to shorten the gate individually for each step.
> 
> 
> So, any suggestions? (in relativly novice terms
> please - im still quite near
> the bottom of the curve ;)
> 
> Thank you,
> 
> Julian
> 
> 
> 
> 
>