The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: Paul Burke
Subject: Re: Loudspeaker and microcontroller
Date: Wed, 23 Oct 2002 07:31:14 +0000
Organization: Scazon Systems
NNTP-Posting-Host: host213-120-25-119.webport.bt.net (188.8.131.52)
X-Mailer: Mozilla 4.7 [en] (Win98; I)
> 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.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup