Designing a Tone Generator for Telecommunications

AI Thread Summary
The discussion focuses on designing a tone generator for telecommunications, utilizing a 555 timer as an adjustable oscillator. The creator aims to produce a constant tone that can be combined with the 555 timer's output to create a pulsing sound. There is a request for advice on generating a constant tone effectively. Suggestions include researching "Sine Wave Generator" designs, specifically the Wien Bridge method. The conversation emphasizes the need for a reliable circuit to achieve the desired sound output.
aliaze1
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I am trying to design a tone generator similar to those used in telecommunications applications (ex: http://www.tessco.com/products/displayProductInfo.do?sku=89724&eventPage=1) The probe (inductive amplifier) can be used on any tone generator, so I plan to use it with mine.

So far, I have thought of using a 555 timer as the oscillator (since it is also adjustable, see astable mode http://en.wikipedia.org/wiki/555_timer_IC). I am having trouble figuring out how to design a circuit that creates a constant tone (should be easy). This constant tone (a constant voltage) will be AND'd with the output of the 555 timer, to make a pulsing sound/on-off sound.

Any tips on generating a constant tone? Thanks!
 
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You want to Google 'Sine Wave Generator" such as Wien Bridge.
 

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