"John Fields" wrote in message
news
On Sun, 25 Dec 2005 05:55:22 -0500, "Henry"
wrote:

Hi, dabbling with some TTL stuff that I dug out of storage. Im about 25
years rusty since I tinkered with this stuff all those years ago. Anyway,
working on a project where it would be deal to have a 555-timer based
monostable multivibrator (with retrigger ability.) Is that possible with
the
555? I have found many circuits online (actually mostly the same one over
and over again) but they dont seem to support re-triggering with the 555.

---

Try this: (view in Courier)


+V-----------------------+--------------+-------+
| | |8
[1K] [Rt] +---+---+
| | 2|_ Vcc |3
+--------------|--O|T OUT|-- OUT
| | 6| |
C +---|TH |
IN-------+-[0.1µF]--+--B NPN | 7|_ 7555|
| | E +-----+--O|D |
| | | | +| | GND |
| | | D [Ct] +---+---+
[10K] +-----------G NCH | |1
| | | S | |
| [10K] | | | |
| | | | | |
GND-----+----------+----+--------+-----+-------+

The input is a positive-going pulse or edge.


--
John Fields
Professional Circuit Designer

Thanks, I will give it a try. One question. I am uncertain what the NCH
component is. I assume its not hydrogen cyanide as that would be HCN. :-)

Henry