SV: Re: SV: Re: [sdiy] BBD clock circuit

[Harry Bissell Jr]

By "totem pole" I meant an output that is capable
of sourcing or sinking current. The data sheet fro
that SG part showed NPN outputs with a enter tapped
transformer...  so they work alternately to reset the
flux. The BBD needs to drive active high and active
low...

H^) harry  (oh yeah ... BBDs suck)

--- karl dalen <dalenkarl at yahoo.se> wrote:

> Im not so shure what you actually ment or what it is
> you 
> trying to achivev but there isnt so many ways to
> drive a BBD.
> If you for instance take a 4046 run its vco out
> trough the 
> Xor gate then you get the two off phase signals to
> drive the BBD the same is with switching regulators
> with the added benefit for adjusting dedband and/ or
> the actuall pulse width!
> 
> KD
> 
> --- "JH." <jhaible at debitel.net> skrev:
> 
> > >> I saw the gates that prevent overlapping: but
> the output
> > >> is just a half-bridge, i.e. two transistors for
> driving
> > >> a center tapped transformer for pus-pull
> operation.
> > >> For a BBD, I think I need a full H-Bridge -
> that's why I was asking.
> > >>
> > >I think you mean "totem pole" output ???
> > >
> > >An H bridge would be a four transistor structure
> with a floating load...
> > >you don't need
> > >that for a BBD (which suck, btw :^) which is
> single ended at the clock
> > 
> > I'm never so sure about using the right words. But
> if totem pole, then two
> > totem poles (for the two clock inputs). Now in
> switched power supplies,
> > you use two totem poles (=  one H bridge) to drive
> a floating winding
> > indeed.
> > So even if in the BBD application you wouldn't
> call it H-bridge, you might
> > call it H-bridge in a switcher IC that you want to
> (ab)use as BBD driver.
> > 
> > JH.
> > 
> > 
> > 
> 
>