74LS90 replacement

[Jeremy Brookes]

> Another related module is the "double-pulse waveform generator", which
> uses a pair of window comparitors to produce two pulses whose width and
> amplitude can be under voltage control. I've made several versions of
> this shaper over the years. The original work was written up for
> Electronotes in the 1970s.

I have a circuit to do something like this on my web page, listed as a
"harmonic generator"

jezz.