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From: email@example.com (N. Thornton)
Subject: Re: Basic Audio Design Help
Date: 19 Nov 2002 16:38:31 -0800
NNTP-Posting-Date: 20 Nov 2002 00:38:31 GMT
"Harry Snodgrass" wrote in message news:...
> Hello all,
> 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
I am left with not much idea what youre trying to do. Quite confused in fact.
Do you want a 12v bleep when the power is applied?
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