Revolutionary...Micro-switch/Relay

New to Electronics and need some help...
I want to add a micro-relay switch to my electronic personal organiser
(which would have a tiny input of 0.2v and a minute current - which I
can't even measure with my multi-meter). Basically, the electronic
organiser has an alarm buzzer which goes on for 30 seconds at a
pre-programmed time each day to wake me up. I want to add a tiny
relay switch of some kind in place of the buzzer, which will act as a
30 second interval timer to switch other external circuits on and off.
Whilst the input voltage and current INTO this relay (out of the
organiser) would be small, the flow through current and voltage in the
external circuit - which is to be switched on and off by the relay -
could vary as I want to use to switch a range of devices.

Does anyone know what the range of specifications for such a relay or
switch could be and where I can get this in the UK? The electronic
organiser is powered by a 3v button cell, if this info is of use?

Thanks
Abdul Ahad
http://uk.geocities.com/aa_spaceagent/spaceprojects.html

 

would it be an idea to use a small microphone mounted such that you can
place the pda buzzer against or near?
Then you don't need to get inside (risk of screw up!) the organiser itself.
A small amplifier / comparator of some sort could then drive a relay, all
powered externally.
hth
Neil

 

Hi Neil,
Thanks, sounds like a good solution which I never thought of myself.
The only thing is I wanted the whole thing to be 'autonomous', so that
it comes on and switches itself off after 30 seconds at a pre-defined
time each day... which the buzzer in my organizer does. Is there a
low wattage consuming microphone on the market to your knowledge that
could do the trick?
Thanks, again.
Abdul
http://uk.geocities.com/aa_spaceagent/spaceprojects.html

 

I'm thinking you could probably figure out how to slap something together
that would operate on a couple AA batteries. You'd place the organizer near
the sensing microphone, and when it's alarm goes off, it would trigger the
relay in the sensing apparatus. What do you really want to do? Turn a
light on-and-off or something?

 

I wanted to use the output from the orgainser to switch on a small
motor which will drive a fan to dispense fish flakes into a pond as
automatic fish feeder! Its the microphone & relay specifications that
I need to know. What specifications can they be for 2 AA batteries? I
can then buy them in Maplins.
Thanks
Abdul Ahad
http://uk.geocities.com/aa_spaceagent/spaceprojects.html