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From: John Woodgate
Subject: Re: I need help with a design of SOUND SENSOR LIGHTING SYSTEM, can anyone give me a hint?
Date: Mon, 25 Nov 2002 04:43:56 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Mon, 25 Nov 2002 06:52:56 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Jean
wrote (in <email@example.com>) about 'I
need help with a design of SOUND SENSOR LIGHTING SYSTEM, can anyone give
me a hint?', on Sun, 24 Nov 2002:
>I think you gave me the information that I want. I think the LM3916
>will do the job. This circuit that I want to build will be able to
>detect the sound level as you said, and the lights will change color
>accordingly to the sound level that the circuit detects. I guess that
>I need to build in some kind of sensor and a microphone to receive the
> Do you have any idea where to find that type of sensor?
Sensor for what? The microphone is all the 'sensor' you need.
> And what kind of microphone???
An inexpensive electret capsule will do very well. You need to
understand how to power it and extract the signal. You will also need a
simple op-amp amplifier and a simple diode rectifier to feed the LM3916.
Actually, that is a pretty rare beast; the LM3915 is a bit easier to get
and will do just as well. The National Semiconductor data sheets and
application notes are excellent for these devices.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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