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From: "Harry Snodgrass"
Subject: Basic Audio Design Help
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Tue, 19 Nov 2002 17:44:14 GMT
NNTP-Posting-Date: Tue, 19 Nov 2002 12:44:14 EST
Organization: PenTeleData http://www.ptd.net
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
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