Re: a ircuit to swith a relay by alarm clock

John Fields <jfields@xxxxxxxxxxxxxxxxxxxxx> wrote in message news:<ukal615f5ttrv5tjj1h13esrt2dn2ao37u@xxxxxxx>...
> On Sat, 23 Apr 2005 10:51:19 -0700, Peter Bennett
> <peterbb@xxxxxxxxxxxxxxxxx> wrote:
>
> >On 23 Apr 2005 04:41:48 -0700, Tommi-Vogel@xxxxxx (Thomas Vogel)
> >wrote:
> >
> >
> >> You´re right, but for me it had been a big puzzle work, to know how I
> >>must construct the elements, if I don`t have seen the schematic with
> >>the elements in the right order, here while I have answear you.
> >>
> >>What are comparators? I don´t have find it in my dictornary. Can you
> >>explain it?
> >
> >A comparator is an integrated circuit which has two inputs (called +
> >and -), and one output. When the + input is more positive than the -
> >input, the output will be high. If the - input is more positive, the
> >output will be low.
> >>
> >>And what is (COIL) and (1N4148)? Is the last one a diode?
> >
> >(COIL) is the coil of the relay, and (1N4148) is a diode. The "K"
> >indicates the cathode end of the diode.
> >>
> >>
> >>
> >>And who are these conected? * *
> >>
> >>> >> | | +-|+\ | | | | | O--> |
> >>> >> | | | | >-+------|-|+\ | | |
> >>> >> [BAT] +-[0.1µF]-+-----|-|-/ | | | >--+-------+ +----------->NO
> >>> >> | | | | | +-|-/
> >>
> >
> >>And what did this mean:
> >>
> >> --|+\
> >> | >---
> >> --|-/
> >>
> >That is a comparator
> >
> >You will have to go to the National Semiconductor website (or google
> >for "LMV393 data***") to get the data*** for the comparator that
> >John suggested - The LMV393 is a dual comparator - there are two
> >separate comparators in the package. I would suggest using an LM393
> >instead, as the LMV393 is in a tiny surface mount package which will
> >be hard to handle.
>
> ---
> I chose the LMV393 because (at 5V) its supply current is 200µA max,
> yet it can sink 20mA, so it beats the LM393 on both counts. But
> you're right, it is surface mount, which the OP might not be able to
> deal with. So, he gets to trade one off against the other or, maybe,
> some kind soul will find him a DIP alternative. :-)



I have found four different comparators of LM393:

LM393 N (0,4µA)
LM393 Mot (0,25µA)
LM393 P TIS (0,04µA)
LM Mx NSC (0,4µA)

Which of these should I take?

What are the conditions of the relay? I don´t find a COTO... . Please
tell me the voltage and the resistence of it or a other model.
.

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