Using a PIR sensor to switch a speaker.

Please..
How do I make the speaker emit a tone?

Best regards

Cameron

"Cameron" wrote in message
...

Using a PIR sensor to switch a speaker.

Please..
How do I make the speaker emit a tone?

Best regards

Cameron




--
Cameron

Drill & tap a narrow strip of plastic so you can mount an adjusting screw on
the front of the LS, then stick some self adhesive metal foil on the cone
and glue the plastic strip to the front of the LS so the screw can be
adjusted to just touch the foil. Wire the LS coil in series with the home
made buzzer contact and connect a battery. Adjustment of the screw will find
a point where energising the LS coil breaks the contact, when the contact
breaks the cone moves back into contact and the cycle repeats as long as
power is applied - note its polarity sensitive so if first try don't work
try reversing the battery.

ian field wrote:
"Cameron" wrote in message
...

Using a PIR sensor to switch a speaker.

Please..
How do I make the speaker emit a tone?

you need an oscillator.

Drill & tap a narrow strip of plastic so you can mount an adjusting screw on
the front of the LS, then stick some self adhesive metal foil on the cone
and glue the plastic strip to the front of the LS so the screw can be
adjusted to just touch the foil. Wire the LS coil in series with the home
made buzzer contact and connect a battery. Adjustment of the screw will find
a point where energising the LS coil breaks the contact, when the contact
breaks the cone moves back into contact and the cycle repeats as long as
power is applied - note its polarity sensitive so if first try don't work
try reversing the battery.

that works, and makes an orrible racket, but I doubt it woudl last long
with an aluminium contact.

NT

Cameron:

Why screw around with a speaker?
........ go to www.radioshack.com and type in "buzzer" in the search.....
you will get a look at least a dozen or more cheap buzzers that with various
specifications.

Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - -



"Cameron" wrote in message
...

Using a PIR sensor to switch a speaker.

Please..
How do I make the speaker emit a tone?

Best regards

Cameron




--
Cameron

Common sense always shines through!

I think a your right a buzzer is the answer...

Thank you all for your comments

Best regards

Cameron

In article ,
Cameron wrote:
Using a PIR sensor to switch a speaker.

Please..
How do I make the speaker emit a tone?

Why not just buy a sounder? These are self contained units that produce a
'tone' from a simple DC supply. Using an ordinary speaker isn't as
efficient as they are made to handle a wider frequency range. Restricting
this range to what's needed can make the unit smaller as well as more
efficient. However, if you're determined to use a speaker, there are a
number of ICs on the market that produce alarm tones.

--
*It is easier to get older than it is to get wiser.

Dave Plowman London SW
To e-mail, change noise into sound.

ian field wrote:
"Cameron" wrote in message
...

Please..
How do I make the speaker emit a tone?

Drill & tap a narrow strip of plastic so you can mount an adjusting screw on
the front of the LS, then stick some self adhesive metal foil on the cone
and glue the plastic strip to the front of the LS so the screw can be
adjusted to just touch the foil. Wire the LS coil in series with the home
made buzzer contact and connect a battery. Adjustment of the screw will find
a point where energising the LS coil breaks the contact, when the contact
breaks the cone moves back into contact and the cycle repeats as long as
power is applied - note its polarity sensitive so if first try don't work
try reversing the battery.

If you use copper contacts with a bit of bulk, not foil, and fit RC
spark suppressoin I expect it would work reliably.


NT

"Sofie" wrote in message
...
Cameron:

Why screw around with a speaker?
....... go to www.radioshack.com and type in "buzzer" in the search.....
you will get a look at least a dozen or more cheap buzzers that with
various
specifications.

Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - -



"Cameron" wrote in message
...

Using a PIR sensor to switch a speaker.

Please..
How do I make the speaker emit a tone?

Best regards

Cameron




--
Cameron



Maybe I took the OP's subject line too literally, but that is what was asked
for!