[sdiy] 4017 sequencer pulses

[Scott Gravenhorst]

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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