This simple project is an audio oscillator based on the LM386 audio amplifier. It can be used in two different modes of operation: "Code" or "Alarm". In the "Code" mode it can be used as a Morse Code generator. When the push button is pressed, the circuit will produce a tone of unvarying pitch to send the desired Morse Code. In the "Alarm" mode, it will produce a tone as long as the supply voltage is connected.