[sdiy] Delaying a pulse with a CMOS chip ?

[Ray Wilson]

Hi Linium

Yes the CD40106 is a schmidt inverter. And If you use it you need to use a
second inverter to reinvert the signal. If the chip you are putting the
delayed signal into is happy with just the RC then great. Even if its input
driver chatters a bit it mustn't matter if its working.

You are probably good to go.

Ray

----- Original Message ----- 
From: "Linium" <intent at netpratique.fr>
To: "Ray Wilson" <raywilson at comcast.net>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Monday, May 17, 2004 9:04 AM
Subject: Re: [sdiy] Delaying a pulse with a CMOS chip ?


> On Dimanche 16 Mai 2004 16:56, Ray Wilson wrote:
> > Hi Linium
> >
> > Use the CD40106 (equiv 74HC14) with an RC on the front to get the delay
and
> > then re-invert it to get your delayed original. A 10K into 100pF ought
to
> > give about 10 uS of delay.
> >
> > Ray
> >
>
> Thks for the info you sent to me, i implemented it but without this chip.
It
> seems to work ! :)  Since the pulse goes to a 4516 counter, i assume that
i
> don't need the inverter ?
>
> Or is there some special need for the CD40106 (or equivalant), for
instance is
> the input pin of this chip of a special kind that is needed after the RC
> thing ? Does it need Schmitt Trigger input to work well  (better stability
of
> the voltage threshold) ?
>
> Thx,
>
> Linium
>