I was putzing with a project where I wanted to retrigger a 555 monostable. Searches almost invariable came up with "555's are not retriggable". I know about the 74123 and the CD4538, but had to try. So, I started thinking about what you could do to make one retriggerable. In the attached, the two circuits on the left are what I came up with that worked. After a little later googling I found:http://www.doctronics.co.uk/555.htm#retriggering. Their circuit is in my lower-right. Since I wanted a positive-transition trigger, as in my first two circuits, I modified their circuit to get the one in the upper-right.
I don't know if I'm reinventing a wheel, but thought I'd post them.
ken
I don't know if I'm reinventing a wheel, but thought I'd post them.
ken
Attachments
-
48.8 KB Views: 481