Re: d-flop one-shot

On Wed, 10 Jul 2024 15:56:51 -0400, bitrex <user@example.net> wrote:

On 7/10/2024 12:16 PM, john larkin wrote:

If you google   use d-flop as one-shot
 
you get some remarkably silly circuits. Many just swipe from this
image:
 
http://www.discovercircuits.com/DJ-Circuits/oneshots.htm
 

>
I get better hits using the term "monostable":
>
<https://www.n5dux.com/ham/files/pdf/Working%20With%20Monostable%20Multivibrators.pdf>
>
Fig 9 is about as simple as it gets. I don't understand why the extra
flop and the low pass and stuff after the button in the link you posted,
it's like they never heard of a passive differentiator before.
>

Yikes, 36 years old. CD4000B logic.

I like d-flop one-shots because they are fast, truly edge-triggered,
and can be gated with the D input.

But RC feedback into a reset input is risky at best. Some flops simply
won't work that way... they hang up.