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I found an old circuit that I made year ago.It was a Astable multivibrator so I tought of making sound whit it.I is simple to make and you can use it on speakers, LED and others.On the output I conected one potentiometer to control the frequency.I forgot list of the parts because I practically got the finished product (The circuit part).Other parts except circuit:

-Speaker or female output

-Switch

-Potentiometer

-LED

LED is blinking becouse astable multivibrator has two outputs so one is speaker, and the other one is LED, that is why the LED stops blinking when speaker is disconnected.The scheme .

Watch it in action ====>VIDEO

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