[sdiy] 4017 sequencer pulses

[daryl groetsch]

thanks, this idea worked, and it's soldered up, just
needs to be panel mounted. i tried the AND gate idea
too, which would have been a little simpler, but the
down slope of the pulse was too high, it triggered on
the up and down. maybe if i messed with it longer, but
i had to get this done tonight. used green LEDs, and
6/8, 7/8 and "4/4" resets. 
daryl




--- Scott Gravenhorst <music.maker at gte.net> wrote:
> Using a capacitor to "differentiate" the pulse can
> give a very
> narrow pulse at each edge of the input pulse. 
> Diodes can be used
> to eliminate the one you don't want.  If you want an
> adjustable
> pulse width, then this narrow pulse can be used to
> trigger a
> one-shot (ICL7555 timer), but that's more parts,
> more complex. 
> If all you want is a very narrow pulse, the
> differentiator works
> well and is simple, a cap, a resistor, a couple of
> diodes.  The
> size of the cap and resistor determine how wide the
> output pulse
> will be.
> 
> daryl groetsch <synth_dg at yahoo.com> wrote:
> >i am building a very simple percussion sequencer
> with
> >a 4017 cmos chip. each output goes to the input of
> a
> >741 summing amp circuit. it works, except when
> >adjacent outs are used--the pulses run together
> into
> >one long pulse. so i think i need to shorten these
> >pulses. what is the most simple way of doing this?
> >thanks, 
> >daryl
> >
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