| 摘要 |
In a circuit for producing an audible signal, a sounder is connected to an audio frequency signal generator circuit for producing the audible signal. A modulator circuit is connected to the signal generator circuit for controlling it to alter the frequency of the operation thereof. The signal generator circuit and the modulator circuit each comprise two inverters connected in series with a resistor connected in parallel with one of the two inverters. A capacitor is connected in parallel with the series combination of the two inverters and all of the inverters are formed on a single integrated circuit package.
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