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From: Paul Burke
Subject: Re: Loudspeaker and microcontroller
Date: Wed, 23 Oct 2002 07:31:14 +0000
Organization: Scazon Systems
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> Im trying to create a door sensor and door bell configuration using a
> PIC and loudspeaker.
> The problem is making the sound loud enough to hear, a peizo is not
> really loud enough to hear so a small speaker is going to be used. The
> problem is can I drive is directly from the uC pin? Or does it require
> more current than this can supply?
Just a FET buffer (see thread on output buffers - I used a BSS138) with
a 100k pulldown on the gate (not strictly de rigeur), and a 50-75 ohm
coil speaker up to the power supply (don't forget parallel diode). I did
this recently for fun, quite enough noise for a doorbell.
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