Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

On Fri, 13 Apr 2012 17:30:22 -0700, Pilgrim
wrote:

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

If accuracy isn't critical ( 10% variation either way is OK), then a
pair of 555 timers (or a 556 dual timer) could provide what you
specified.

If timing accuracy is critical, then a simple micro like the PICAXE
(under $5, programmed in BASIC) would be a better choice. For even
better accuracy, you can add a crystal as the clock source and have
one or two seconds per day timekeeping accuracy.

"Pilgrim" wrote in message
news
Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

Google "555 timer".

Pilgrim wrote in newsilgrim-3B1BFC.17302213042012@
70-3-168-216.pools.spcsdns.net:

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

buy two timing relays.

"Pilgrim"

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes.


** Do the above two ranges need to be independently adjustable - or is that
the tolerance band ?

You need to be FAR more specific.



.... Phil

In article ,
"Phil Allison" wrote:

"Pilgrim"

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes.


** Do the above two ranges need to be independently adjustable - or is that
the tolerance band ?

You need to be FAR more specific.



... Phil

Yes, they should be ind. adj. Accuracy is not important.
Thanks
CP

wrote in :

On Fri, 13 Apr 2012 17:30:22 -0700, Pilgrim
wrote:

Need a ckt. that will give me 2to5 sec. pulse every 1to2 minutes. Would
prefer not to get involved with a microP.
Thanks.
CP

If accuracy isn't critical ( 10% variation either way is OK), then a
pair of 555 timers (or a 556 dual timer) could provide what you
specified.

If timing accuracy is critical, then a simple micro like the PICAXE
(under $5, programmed in BASIC) would be a better choice. For even
better accuracy, you can add a crystal as the clock source and have
one or two seconds per day timekeeping accuracy.


for such long timing periods,use a CMOS 7555/7556.

a neat site I found;
http://www.daycounter.com/Calculator...lculator.phtml

calculates values for 555 astable timers.

--
Jim Yanik
jyanik
at
localnet
dot com