Re: Quadrature divider circuit?

Frank,

My first thoughts were that you could just use divider chips, but
when you look at the timing relationship, at div2 this would give
1/8th. lead/lag and would progressively diminish with greater
divisions.
I suspect that controllers such as Gecko's won't like this very much
as the 320 generates 4x signals from the pulse trains and I don't
know what it does with them internally. If you are using other than
div 2 with the 7490s you also need to reset the count when the motor
changes direction.

I'm not sure how critical it is to maintain the quadrature
relationship, so I will be very interested to see how you get on over
the weekend. I have done the paper design for a circuit that will
keep the correct phase angles both in the forward and reverse
directions, but it is more complex, hence the post. I'd rather be
working at the machine rather than developing electronics.

Bernard

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Bernard R

<bwjarandall@c...>"

> <bwjarandall@c...> wrote:
> > Hi All,
> >
> > To save re-inventing the wheel, does anyone have a circuit to

reduce

> > the quadrature signals from an encoder. I am looking for a

divide by

> > 2 or possibly div 4.
> >
> > Thanks
> >
> > Bernard R
>
>
> Funny you should ask ,... this weekend I wiring one up. Well wiring

up

> is the wrong term. Just two IC's (7490's ) per encoder, nothing

else.

> Will divide by 2 , 5 ,or 10 . Cost me 4.99 a three pack at the

local

> electronics store
>
> Sure beats $ 120.00 for 3 new encoders
>
> Let you know how it works Mon.
>
> Frank ,....