Re: Circuit Power Consumption

On 2006-06-27, phaeton <blahbleh666@xxxxxxxxxxx> wrote:


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No. A 555 is a very bad choice for such a long timeout. However,
the second one could be used to drive a piezo buzzer.
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(and)

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No. There is no need for a voltage divider since CMOS is available
which can run directly off of 9V at _very_ low current.

Ahh ok. is the "755" and "CMOS 555 Timer" the same thing? Jameco's
'search' function was giving me the same results for both searches, but
IMHO it's not the greatest at times.

AFAIK 7555 and 4555 are variuation on the CMOS based 555 theme

I'd use something like a 4060 for the timer and a transistor to turn
on a 555 astable to drive the piezo buzzer.

Good thing I asked. I had never heard of a CD4060 before ;) Does "CD"
mean 'CMOS' or something?

4060 is a cmos part number CD4060 is one variation on that part
(R-C oscilator with 14-stage divider (divide the frequency by 4096))

It's pretty non-critical. The long 'wait' period could vary by a
couple of hours, actually. I would prefer it to err on the side of
longer, but either direction is ok. I bet that any variation would be
in *minutes* at the most, huh?

you'll need to look at the stability of the capacitors you choose,

However, when you say "what's being used to generate the timer's
clock", do you mean 'which IC'?

more the timing parts, resistor and capacitor.

I'm assuming that the 4060 can be set
up to just 'run' automatically once you apply power to it, like the 555
and things, right? No need for an external clock or trigger.

yup.

Jasper:
If i were to use a uC then I'd have to make it play music or something.
You know, "The Atmel Tiny Canon in Dbminor" or something :-)
I'm already trying hard enough to resist using multiple buzzers and
multiple 555s to play reciprocating tritones or something. :-D

:) polyphonic music is totally doable and the power consumption is less than
10 microamps.

Bye.
Jasen
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