This circuit 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. In the "Alarm" mode, it will produce a tone for as long as the supply voltage is connected.
Supply voltage: 6 - 9V DC @ 50mA. Includes 9V battery snap.
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