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On Wednesday 31 January 2018 11:19:51 you wrote:
> I don't know I was wondering that myself. Is it significant?
If the HIGH level is too low the following divider can't divide properly!
If the LOW level can sink few mA of current from the IC the divider can be degraded!
Random divide factor can be a consequence.
from 74HC74 data sheet, see the VIH and VIL
Regards
Claudio
>
> Best Regards
> Chris Wilson
>
> On 31 Jan 2018 11:07 am, "Claudio Pozzi" <[email protected]> wrote:
> > On Wednesday 31 January 2018 00:04:30 you wrote:
> > > Hello Andy,
> > >
> > >
> > >
> > > I cannot test into the divider as I lost a pad off the PCB and have no
> > >
> > > more IC's left, but some are coming and I can jury rig the board for
> > >
> > > testing even if it won't be pretty, but I added a Schmitt IC on a
> > >
> > > breadboard with long leads, biased with two 10k resistors on the input
> > >
> > > pin, and AC coupled with a 0.1uf ceramic. The resulting wave form is
> > >
> > > at:
> > >
> > >
> > >
> > > http://www.gatesgarth.com/lf-schmitt-on-collector-q2.jpg
> >
> > HI Chris.
> >
> >
> >
> >
> >
> > Why you have a negative low level?
> >
> > Also in the previous post in channel B:
> > > Faulty LF oscillator or divider first
> > >
> > >
> > >
> > > http://www.gatesgarth.com/R17-to-pin3.jpg
> >
> > 73
> >
> > Claudio ik2pii
> >
> >
> >
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