It's an electronic 12V 25W siren. But if 25W, then the current is more
than 2Amps at 12V, isn't it ? Modest MOSFET would be one at 20V and more
than 5A, is this also your oppinion ?

Lucian

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of David VanHorn
Sent: 17 aprilie 2004 19:34
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE:]Driving a siren

At 09:53 AM 4/17/2004 +0300, Lucian wrote:

>Dear Piclisters,
>
>I have yet another question for you. I am still a newbie in electronics
>and PIC's and I feel a little bit shamed that I only come to ask
>questions on this list and rarely know how to answer to other
questions,
>but hope that someday I will be able to be more active here.
>My questions is: I want to drive a siren from a microcontroller pin.
The
>siren is an alarm one, and consumes 12V and 3A at maximum. Which would
>be the best way to control it (on/off) ? A power MOSFET, a triac maybe,
>a relay ?

Is this a motor driven siren, or electronic?

If electronic, then most any modest relay or mosfet will do.

If motor driven, I would use a relay, controlled by a mosfet.

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