[time-nuts] precision timing pulse

Scott Stobbe scott.j.stobbe at gmail.com
Tue Nov 15 19:47:09 EST 2016


If you are trying to avoid writing code, the 74hc5555 might be worth taking
a look at.

On Tue, Nov 15, 2016 at 3:00 PM Chuck / Judy Burch <ciandjaburch at gmail.com>
wrote:

>
> I'm building a laboratory scintillation counter that uses my HP 5335a
> counter as a read-out.  The FREQ mode gives only approximate results
> (maximum gate time is about 5 seconds).  The TOT mode counts pulses for
> an arbitrary time that can be set using the "external arm input" on the
> rear panel.  So I need a timing pulse (of either polarity) of known and
> adjustable width (time).  One way to do this is with a PIC frequency
> divider taking the counter 10MHz output down to 1 PPS following that
> with two or three ripple counters to get a 1 - 5 - 10 - 50 ...
> sequence.  That I understand.
>
> How do I get a pulse to start with a push button and then stop for
> example 500 or 10,000 seconds later?
>
>
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