[time-nuts] precision timing pulse

David G. McGaw david.g.mcgaw at dartmouth.edu
Tue Nov 15 15:08:34 EST 2016


The PIC can easily be programmed to be armed with a switch and stop at a 
particular count, or you can use actual logic - debouncer, gating 
flip-flop and programmable counter!

David N1HAC


On 11/15/16 1:57 PM, Chuck / Judy Burch 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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