Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default timer circuit

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

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.
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Default timer circuit


"Pilgrim" wrote in message
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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".

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Default timer circuit

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.
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Default timer circuit


"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










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Default timer circuit

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
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