Long delay IC

[SS]

Hi,

I would like to make a 4 -5 day timer. Is there an IC or a circuit that I
can use
to make this circuit.

Thx

SQ

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

There are plenty of 8 pin microcontrollers that can do this.

If you don't have microcontroller experience (and don't want to learn now),
just use a 555 connected to a big counter such as a 4013; cascade as needed.

Use a crystal oscillator if you need decent accuracy...

Or use a 4060 CMOS chip as was mentioned here recently. It has a
built-in oscillator, and can divide by 2^14?? Check it out. This is
the HCT version.
http://www.semiconductors.philips.com/pip/74HC4060N.html

It looks like 2^14 is 16384, so if it's oscillating at 1Hz, that would
be a bit over 4.5 hours max. You could cascade two of these and get
many days' delay yet the Fosc would be well above 1Hz and component
values would be reasonable.

4013? Big? Hrmm.

You've attempted (but failed miserably) to crosspost this to several
bogus newsgroups.

 

[David]

Hi,

I would like to make a 4 -5 day timer. Is there an IC or a circuit that I
can use
to make this circuit.

Thx

SQ

Hi,

Try the MC14536B. Farnell have them in DIP for around $2.50, and datasheet
on line. This has an oscillator (RC if required), and programable
divider from 2^0 to 2^24, with with a 1HZ oscillator will give approx 200
days delay.

David

 

[R. Steve Walz]

Hi,

I would like to make a 4 -5 day timer. Is there an IC or a circuit that I
can use
to make this circuit.

Thx

SQ

---------------
Way too easy. Daisy chain a few CD4040's with a crystal clock.
What? You don't know how? Do we have to show you how to do
EVERYTHING???? Take the crystal out of a watch.

-Steve

 

[CHUCK]

Hi,

I would like to make a 4 -5 day timer. Is there an IC or a circuit that I
can use
to make this circuit.

Thx

SQ

Try a couple of MM5369N long duration timers in series (see my article in
73 Magazine Sept 1979 if you can find a copy).

cheers,
chuck...

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

Try a couple of MM5369N long duration timers in series (see my article in
73 Magazine Sept 1979 if you can find a copy).

If you can even _get_ those custom programmed ICs nowadays..

IIRC that's the one radio scrap used to sell, and you needed to use a
3.58 MHz color xtal with it. It put out 60 Hz, or was it 1 Hz? In any
case, it's as rare as hens' teeth nowadays.

The NG reader pitched a fit with those non-existent newsgroups such as
news.electronics.*. When are you going to stop trying to post to
non-existent newsgroups. Duh.

 

[Chuck Harris]

If you can even _get_ those custom programmed ICs nowadays..

IIRC that's the one radio scrap used to sell, and you needed to use a
3.58 MHz color xtal with it. It put out 60 Hz, or was it 1 Hz? In any
case, it's as rare as hens' teeth nowadays.

Of course, using a PIC12F675, you can do the same thing, fit in an 8 pin package
with a 3 line program in C.

Because it is a custom job, you can take a color burst xtal as your drive source,
and put out anything you want for the timed output....60Hz, 1 pps, 1 pp century...

Power draw is miniscule, like the original.

-Chuck

Standard disclaimer applies, you need some knowledge, and about $50 worth of
programming hardware to make this work.