74LS90 replacement

[Ian Fritz]

Plinio --

Yes, this will work. One pretty interesting way is to use the LM3914 LED
driver chip. Feed a saw in and you get ten separate pulses out. You can
then weigh and sum them to get an approximation to any waveform.

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.

 Ian

Plinio Andres Barraza wrote:
> 
> Instead of using these chips that generate a given amount of steps,
> Why not make an LFO with sweveral waveform out (like noise, saw, triangle,
> [sine, square,] and their inverses) and instead of adding step out, add a
> couple sample and hold circuits that you could set up so that you can get
> any number of steps up from a sawtooth (up or down), or ascending
> decending steps from tri or sine, or random from noise.
> 
> Is this possible or would it make the circuit too complex?
> 
> Plinio