Re: creating a square-wave out of a transition

From: Rob (rrjonasar_at_lineisp.co.uk)
Date: 11/29/04 

Date: 28 Nov 2004 23:21:16 -0800

"Keith" <NOkmonSPAM@adelphia.net> wrote in message news:<OvednXx_7anrNTXcRVn-vQ@giganews.com>...
> Rob,
>
> "Rob" <rrjonasar@lineisp.co.uk> wrote in message
> news:b7d6fa28.0411261313.5bbfdab0@posting.google.com...
> > I think I've got it now. Go to the website below to look at what I
> > think you have in mind. I will add to it as and when I get time.
> > http://notrocketscience.mysite.wanadoo-members.co.uk/mfmgenerator.htm
> > Regards
> > Robert
>
> Yeah, that is pretty accurate. It just so happens that the traces pictured
> there don't include output filtered by the D-flip flop, so the width of the
> those 0-bits is actually 390ns, and not 640ns.
>
> The best-case goal would be for the 0-bits to be 2us, but if I could only
> get it to 1us, I would take it.
>
> Thanks,
So long as the monostable period is less than the shortest repeat
period of your waveform, you should be OK. Probably best to make some
portion of the timing resistor adjustable (500R variable and 1k2
fixed).
This puts me in mind of an 80's computer that my brother had. Had to
be tweeked twice a year to make the HDD work, once in the winter and
again in the summer, to take ambient temperature changes into account.
>
> keith

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