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From: Gary Tait
Subject: Re: Basic Audio Design Help
X-Newsreader: Forte Free Agent 1.92/32.572
Date: Tue, 19 Nov 2002 14:18:09 -0500
NNTP-Posting-Date: Tue, 19 Nov 2002 14:18:49 EST
Organization: WorldCom Canada Ltd. News Reader Service
On Tue, 19 Nov 2002 17:44:14 GMT, "Harry Snodgrass"
>I have to create a circuit to achieve a specific function for a project in
>our office. I am good at wiring, circuit board work and understand basic
>principles but have never designed a circuit. This should be a very simple
>circuit for you if you have some time to make suggestions.
>I have a visual light cueing system that is driven by 12volts DC at 1 amp to
>trigger one of two lights when a switch is pressed up to 300 feet away. It
>uses a relay powered by the 12volts to create the trigger function for each
>light when each corresponding button is pressed. This is driven by a simple
>12 volt contact closure to make the light go on.
>This pulse travels down the 300 feet of wire to another set of two lights to
>also make them go on and off at the same time as the first two. To clarify
>this, there is a red and green light each driven by it's own button that
>creates it's own contact closure thus powering the circuit with the 12volt
>pulse to light the bulb.
>What I need to do is add an audio beep into this circuit at the end of the
>300 feet run with the second set of lights. I need to have a separate tone
>for each light color. Something like 1khz and 500khz. Enough of a
>difference to definitely hear. I need this audio signal to play out a
>1/2watt mini speaker and feed a headphone jack, both controlled by a volume
>control. They don't have to be super loud but need to definitely be heard.
>I can add in a separate power source if necessary.
>I have played with 555 timer circuits and can't seem to get the circuit
>correct to drive the speaker and the headphone.
>Any suggestions or help would be greatly appreciated.
>Thanks in advance
Get a two tone chime, and connect each solenoid to each light.
If you want to do it electronically, (after you get an audio
oscillator working), you can make one do both, by using diodes to
activate the circuit when either light is lit, but take voltage from
one to the oscillator circuit to somehow shift it's frequency.
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